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Artículos de revistas sobre el tema "METAL-CONTAINING COMPOUND"

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Publicado: 10 de marzo de 2023

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1

Feldborg, Lise N., Wojciech J. Saletra, Patrizia Iavicoli y David B. Amabilino. "Central metal ion determined self-assembly of intrinsically chiral porphyrins". Journal of Porphyrins and Phthalocyanines 15, n.º 09n10 (septiembre de 2011): 995–1003. http://dx.doi.org/10.1142/s108842461100394x.

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The aggregation of a tetraaryl-porphyrin with chiral amide-containing side groups depends critically on the central metal ion in the tetrapyrrolic core, an effect shown dramatically in solution as well as in the gel formation by the compounds. In solution, the circular dichroism (CD) spectra of the metalloporphyrins show that they all aggregate to some degree, and in most cases the aggregates of the metal-containing species is more favored than the parent free-base porphyrin. The compound which shows the greatest optical activity is the zinc(II) porphyrin which forms a J-aggregate with large Cotton effects in the CD spectrum. Infrared spectroscopy revealed that this aggregate is favored by interaction of the amide oxygen atom with the zinc(II) ion at the core of the porphyrin. The other metalloporphyrins, containing divalent copper, cobalt, and palladium or manganese(III) acetate all show CD activity, and all but the cobalt compound form gels in hexane or cyclohexane. The morphology of the xerogels formed after evaporation of the solvent from these gels depend greatly on the metal ion, with only the copper porphyrin — which shows a clear H-aggregate in solution — having a fibrous morphology
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2

Tan, Lee-Yae, Lee Tin Sin, Soo-Tueen Bee, Chantara T. Ratnam, Kwan-Kit Woo, Tiam-Ting Tee y Abdul Razak Rahmat. "A review of antimicrobial fabric containing nanostructures metal-based compound". Journal of Vinyl and Additive Technology 25, S1 (15 de septiembre de 2017): E3—E27. http://dx.doi.org/10.1002/vnl.21606.

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3

Weigand, Wolfgang y Gabriele Bosl. "Metallkomplexe mit funktionalisierten Schwefelliganden, IV / Metal Complexes of Functionalized Sulfur-Containing Ligands IV". Zeitschrift für Naturforschung B 47, n.º 8 (1 de agosto de 1992): 1165–69. http://dx.doi.org/10.1515/znb-1992-0818.

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The platinum(O) compound (Ph3P)2Pt(η2H4) (1) reacts with N-(alkyl- and arylsulfinyl) phthalimides R—S(O)-Nphth [R = C3H7 (2a), C4H9 (2b), C12H25 (2c), CH2Ph (2d), Ph (2e) p-CH3C6H4 (2f)] to give the trans-configurated sulfenato complexes (Ph3P)2Pt[S(O)—R](Nphth) (3a—f). The compounds 3a—f have been characterized by IR, 1H, 13C and 31P NMR spectroscopy, 3d—f additionally by their FAB mass spectra. The oxidation of cis-(Ph3P)2Pt(SC4H9)(Nphth) (5) with m-chloroperbenzoic acid leads to a mixture of compounds containing cis-(Ph3P)2Pt[S(O)C4H9](Nphth) (6) as a main product.
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4

Ceyhan, Tanju, Mustafa Korkmaz, Türker Kutluay y Özer Bekaroğlu. "Synthesis, characterization and EPR spectroscopy of novel s-triazines bearing three oxygen-linked phthalocyanines". Journal of Porphyrins and Phthalocyanines 08, n.º 12 (diciembre de 2004): 1383–89. http://dx.doi.org/10.1142/s108842460400074x.

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Compound 1 (2,4,6-tris(2-oxaphthalonitrile)- s -triazine) has been prepared by the reaction of 4-nitrophthalonitrile and cyanuric acid in dry DMF as the solvent in the presence of K 2 CO 3 as the base. An interesting s -triazine, containing three oxa metal phthalocyanines ( M = Zn , Co or Cu ) has been synthesized from compound 1, 4,5-bis(hexylthio)phthalonitrile and the corresponding anhydrous metal salts ( Zn ( OAc )2, CoCl 2 or CuCl ) by the method of statistically mixed condensation. The new compounds and phthalocyanines were obtained in sufficient purity after successive washings with different solvents and were characterized by elemental analysis, UV-vis, IR, NMR and EPR spectroscopy.
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5

Courbot, Mikael, Laurent Diez, Roberta Ruotolo, Michel Chalot y Pierre Leroy. "Cadmium-Responsive Thiols in the Ectomycorrhizal Fungus Paxillus involutus". Applied and Environmental Microbiology 70, n.º 12 (diciembre de 2004): 7413–17. http://dx.doi.org/10.1128/aem.70.12.7413-7417.2004.

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ABSTRACT Molecular and cellular mechanisms underlying the sustained metal tolerance of ectomycorrhizal fungi are largely unknown. Some of the main mechanisms involved in metal detoxification appear to involve the chelation of metal ions in the cytosol with thiol-containing compounds, such as glutathione, phytochelatins, or metallothioneins. We used an improved high-performance liquid chromatography method for the simultaneous measurement of thiol-containing compounds from cysteine and its derivatives (γ-glutamylcysteine, glutathione) to higher-molecular-mass compounds (phytochelatins). We found that glutathione and γ-glutamylcysteine contents increased when the ectomycorrhizal fungus Paxillus involutus was exposed to cadmium. An additional compound with a 3-kDa molecular mass, most probably related to a metallothionein, increased drastically in mycelia exposed to cadmium. The relative lack of phytochelatins and the presence of a putative metallothionein suggest that ectomycorrhizal fungi may use a different means to tolerate heavy metals, such as Cd, than do their plant hosts.
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6

Mikhailov, Oleg V. "Polycyclic 3d-metalchelates formed owing to inner-sphere transmutations in the gelatin matrix: synthesis and structures". Reviews in Inorganic Chemistry 37, n.º 2 (27 de junio de 2017): 71–94. http://dx.doi.org/10.1515/revic-2017-0003.

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AbstractProcesses of synthesis of polycyclic compounds containing various 3d-elements, proceeding in gelatin matrix in the systems M(II) ion – (N,S)- or (N,O,S)-containing organic compound A – mono- or dicarbonyl-containing organic compound B, resulting in one of a variety of inner-sphere transmutations, namely “self-assembly”, have been considered and discussed. The chemical nature of the final products of such a synthesis formed under these specific conditions have been compared with the chemical nature of the final products formed by similar synthesis in solutions. It has been noted that in many cases, the nature and chemical composition of these products differ substantially. Specific features of the density functional theory calculated molecular structures of the metal macrocyclic compounds that can be formed due to such a synthesis in the systems indicated above have been discussed, too. The review covers the period 1990–2016.
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7

Barbot'ko, S. L., I. S. Naumov, O. S. Vol'nyi y E. V. Alifanov. "The Effect of Pigments on the Flammability Characteristics of a Rubber Compound Based on Methylvinylsiloxane Rubber". International Polymer Science and Technology 44, n.º 11 (noviembre de 2017): 41–46. http://dx.doi.org/10.1177/0307174x1704401109.

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When parts manufactured from polymeric materials are used in different sectors of industry, the use of different colours may be required. The use of pigments of different chemical nature and often possessing catalytic activity may lead to a change in fire hazard characteristics. The effect of several inorganic pigments based on carbon black and metal compounds on the flammability characteristics of a rubber compound of grade VR-42 (white-coloured) based on methylvinylsiloxane rubber has been investigated. A comparison with a standard rubber compound containing magnesium hydroxide has been carried out. The considerable influence of the presence of carbon pigment with nanosized particles on improvement in residual burning (smouldering) time by comparison with the base combination has been shown. No statistically significant change in this characteristic has been established for a coloured rubber compound of grade VR-42 by comparison with the base combination when mineral pigments of different colours and based on metal compounds are introduced.
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8

Ushkov, Valentin A., Evgeniya V. Sokoreva, Anna V. Goryunova y Stanislav A. Demjanenko. "Fire hazard of phosphorus-containing hard casting polyurethane foams". Vestnik MGSU, n.º 12 (diciembre de 2018): 1524–32. http://dx.doi.org/10.22227/1997-0935.2018.12.1524-1532.

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Introduction. Fire-safe rigid filling polyurethane foams (PUF), meant for low-temperature thermal insulation of pipelines and technological equipment were developed. The effect of concentration of oxyethylated tetraalkylphosphonate pentaerythritol (phostetrol-1) on technological, physico-mechanical and thermal properties, contents of pyrolysis products and main fire hazard indicators of PUFs was explored. The effect of chemical nature and metal compounds concentration of variable valence on fume-generation ability of phosphorous-containing PUFs was examined. Main technological and physico-mechanical properties and fire hazard indicators of developed styrofoams are provided. Materials and methods. Rigid filling PUFs were obtained on the basis of simple oxyethylated polyols and polyisocyanate. Phostetrol-1 was used as a reactive phosphorous-containing compound. As a foaming and hardening catalyst of developed PUF’s a nitrogen-containing polyol (mark Lapromol 294) and dimethylethanolamine was used, and as a foaming agent - mixture of freon - 11 and water. Different metal compounds of variable valence were used to reduce fume-generation ability and toxicity of pyrolysis products of rigid phosphorous-containing PUFs. Thermal properties of examined PUFs were studied with the help of thermoanalytical complex Du PONT 9000. Main technological and physico-mechanical properties and fire hazard indicators of styrofoams were determined under existing GOSTs. Results. The effect of phostetrol-1 concentration in polyester compound on main technological and physico-mechanical properties, contents of pyrolysis products and main fire hazard indicators of rigid filling PUFs was established. It is shown that to obtain moderately flammable PUFs the phosphorous concentration in styrofoam must exceed 2.5 mass. %. The correlation between low-scale evaluation methods of flammability of rigid PUFs was found. The effect of phosphorous concentration on fume-generation ability and contents of pyrolysis products of rigid PUFs was found. The effect of chemical nature and metal compounds concentration of variable valence on fume-generation ability of phosphorous-containing PUFs was examined. It is shown that effective decrease of fume-generation ability and toxicity of pyrolysis products of moderately flammable PUFs occurs when Cu2O or chrome spinels are introduced to the polyester compound. Conclusions. As a result of conducted research it was established that the combined use of phostetrol-1, Cu2O and chrome spinels makes it possible to obtain rigid fire-safe PUFs with high physico-mechanical properties. Fire-safe rigid filling PUFs, developed with the use of raw native materials, are recommended to be used for low-temperature thermal insulation of pipelines and technological equipment.
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9

R, Tamizselvi y Ayyakannu Arumugam Napoleon. "Fluorescent and Colorimetric Chemosensor for the Detection of Toxic Metal Ions of Mercury and Lead – A Mini Review". ECS Transactions 107, n.º 1 (24 de abril de 2022): 16489–99. http://dx.doi.org/10.1149/10701.16489ecst.

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Variations in the predictable level of heavy metals ions have an uncompromising influence on living being and their surroundings. Real sample analysis was used to identify the heavy metal ions by using colorimetric and fluorescence techniques. The interaction of metal ions with the receptor has produced observable signals as measured by its photophysical changes. Nitrogen-containing heterocyclic compounds are the greatest weapons for identifying heavy metal ions, owing to their diverse reactivity, readily available substrate, and exquisite photophysical property. The main goal of this mini-review is to examine the current advancements in the structural analysis of nitrogen-containing heterocyclic compound-based fluorescence and colorimetric sensors. The interaction between receptor and metal by electron transfer mechanism and its wide applications have been developed and used for the sensing of heavy metal ions in the past ten years by various research groups about selectivity, sensitivity, reversibility, pH effect, stoichiometric ratio, binding constant, LOD values, and real-time applications.
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10

Avdeev, Ya G. y Yu I. Kuznetsov. "High-temperature corrosion of steels in acid solutions. Part 3. Inhibitory protection of steel by nitrogen-containing heterocyclic organic compounds and inorganic oxidants. Review". Corrosion: Materials, Protection, n.º 2 (febrero de 2021): 1–23. http://dx.doi.org/10.31044/1813-7016-2021-0-2-1-23.

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The literature and patent data on the protection of steels in high-temperature acid solutions by nitrogen-containing heterocyclic organic compounds and inhibitors of oxidative type were summarized. Composite inhibitors based on substituted triazoles can provide effective protection of low-carbon and chromium-nickel steels in these environments (200 °С). The mechanism of the protective action of these inhibitors is based on the ability of substituted triazoles to form on the steel surface in acid solutions the protective layers chemically bonded to the metal surface. Often these protective layers are basically composed of a polymer complex compound containing triazole molecules and Fe cations (in the case of nickel-chromium steels — Ni and Cr). It is noted that oxidizing additives can be used to protect steels which are in high-temperature acidic media at a passive state. Using the example of corrosion of chromium-nickel steel in H3PO4 solutions (130 °C), it is shown that additives of oxidants (Cu(II) and NO3–) stabilize the passive state of the metal in this medium, preventing the possibility of its active dissolution. Based on analysis of the literature data, a conclusion was made about the prospects of using compositions based on nitrogen-containing heterocyclic compounds for protecting steels in high-temperature acidic environments. These compositions are superior in important technological parameters to mixed inhibitors based on unsaturated organic compounds.
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11

Yao, Shuang, Zhiming Zhang, Yangguang Li y Enbo Wang. "Transition Metal-Substituted Double Dawson-Type Polyoxotungstates and Their Supramolecular Structures". Australian Journal of Chemistry 63, n.º 1 (2010): 96. http://dx.doi.org/10.1071/ch09145.

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Reactions of hexavacant polyoxotungstate [H2P2W12O48]12– ({P2W12}) with various transition metal cations lead to the isolation of three double Dawson-type polyoxotungstates: (C4H10NO)12Na2[α 1-MnP2W17O61]2·7H2O (1), [(CH3)2NH2]3K2Na11[α 1-CoP2W17O61]2·30H2O (2), and Na8K2[Fe2(H2O)8(Fe2P2W16O60)2]·41H2O (3). Compound 1 has a one-dimensional (1D) supramolecular architecture built from a Mn-substituted double Dawson-type polyoxoanion (DDTP) [α 1-MnP2W17O61]2 14–, morpholine, and lattice water molecules. Compound 2 has a 1D supramolecular structure built from the first Co-containing DDTP [α 1-CoP2W17O61]2 16– connected via H-bonding interactions. Compound 3 has a 3D supramolecular structure built from a Fe-substituted DDTP [Fe2(H2O)8(Fe2P2W16O60)2]10– and lattice water molecules. Electrocatalytic studies indicate that these three compounds all display electrocatalytic activity toward the reduction of nitrite.
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12

Isupova, Zalina Y., Azamat A. Zhansitov, Svetlana A. Elcheparova, Svetlana Yu Khashirova, Mohamed Kh Ligidov y Sergey I. Pakhomov. "INVESTIGATION OF COMPLEX COMPOUNDS OF GUANIDINE ACRYLATE WITH MAGNESIUM IONS". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 60, n.º 5 (23 de junio de 2017): 63. http://dx.doi.org/10.6060/tcct.2017605.5579.

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Metal ions in a composition of the polymer compounds can serve as model objects of biological systems and show a number of important biological functions. Particular practical interest are represent polymeric materials containing stabilized metal ions such as silver; copper; iron; cobalt; nickel and magnesium. It is known that the guanidine-containing polymers have intrinsic antibacterial properties. Therefore; the combination of properties polyguanidines (biological activity; bactericidal and hydrodynamic properties) and metal ions (optical; biological; thermal; electrical properties) causes the forward-received new features based on these polymeric metal complexes. By IR spectroscopy and X-ray diffraction the structure of resulting polymer complex compound was studied. Infrared spectral studies have shown that the addition of magnesium ions to the structure of the polyacrylate guanidine leads to significant changes in their IR spectra. It was found that the Mg2+ ions actively interact with the oxygen atom of a carboxylate ion; and the nitrogen atom of the amino group of guanidine polyacrylate forms a new coordination compound. X-ray data showed that the initial polymer polyacrylate guanidine has diffraction pattern of the crystalline substance. The complex polymer of polyacrylate guanidine/Mg2+ has a more amorphous structure; as indicated by characteristic broad lines (halo) on the X-ray pattern. It was found that the obtained complex compound of polyacrylate guanidine/Mg2+ does not preserve the original features of the polymer. This is possible due to the fact that magnesium ions penetrating into the polymer matrix partially destroy it and form a new complex compound.Forcitation:Isupova Z.Yu.; Elcheparova S.A.; Zhansitov A.A.; Khashirova S.Yu.; Ligidov M.Kh.; Pakhomov S.I. Investigation of complex compounds of guanidine acrylate with magnesium ions. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 5. P. 63-67
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13

Aliyeva, L. I., V. M. Abbasov, M. N. Amiraslanova, E. K. Hasanov, Y. J. Aghazadeh y Sh Z. Safarova. "Conservation liquids on the bases of turbine oil of grade T-30 and corrosion inhibitor". JOURNAL OF ADVANCES IN CHEMISTRY 11, n.º 7 (17 de diciembre de 2016): 3715–22. http://dx.doi.org/10.24297/jac.v11i7.2194.

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Conservation liquids have been prepared by adding to T-30 turbine oil different amounts of amidoamine compounds synthesized in 2:1 molar ratio of technical petroleum acids (TPA) to polyethylenepolyamine (PEPA), nitro-compound and phenol-p-alkyl(C8-C12)phenolformaldehyde olygomers on the basis of C14H28 containing α-olefin, as well as composition on the bases of them. Defined that the use of these compounds as compositions records high result as corrosion inhibitor in protection of metal constructions.
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14

Gao, Kunqi, Rui Zhao y Li Sheng. "A theoretical study on novel neutral noble gas compound F4XeOsF4". Physical Chemistry Chemical Physics 23, n.º 15 (2021): 9585–93. http://dx.doi.org/10.1039/d0cp06450e.

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15

Wang, Jun-Sheng, Yun Liu, Hai-Bo Zhao, Jiang Liu, De-Yi Wang, Yan-Peng Song y Yu-Zhong Wang. "Metal compound-enhanced flame retardancy of intumescent epoxy resins containing ammonium polyphosphate". Polymer Degradation and Stability 94, n.º 4 (abril de 2009): 625–31. http://dx.doi.org/10.1016/j.polymdegradstab.2009.01.006.

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16

Mohd Zaid, Hayyiratul Fatimah, Chong Fai Kait y Muhammad Ibrahim Abdul Mutalib. "Photocatalytic Oxidative Desulfurization of Model Oil Using Cu/TiO2 Photocatalyst and Eutectic Based Ionic Liquid: Effect of Metal Loading". Applied Mechanics and Materials 699 (noviembre de 2014): 210–14. http://dx.doi.org/10.4028/www.scientific.net/amm.699.210.

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Titanium dioxide (TiO2) photocatalyts doped with copper metal at different metal loadings were successfully prepared and characterized. Photocatalytic oxidative desulfurization of model oil containing dibenzothiophene as the sulfur compound (100 ppm) was investigated using the prepared photocatalyst. The photocatalyst with 2.0 wt% Cu metal loading showed the best sulfur removal at 66.25%.
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17

Shahriar, Syed, Xue Han, Hongfei Lin y Ying Zheng. "Adsorptive Removal of Nitrogen and Sulfur Containing Compounds by SBA15 Supported Nickel (II) and Tungsten Phosphides and the Adsorption Mechanisms". International Journal of Chemical Reactor Engineering 14, n.º 4 (1 de agosto de 2016): 823–30. http://dx.doi.org/10.1515/ijcre-2015-0107.

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Abstract SBA15 supported transition metal phosphides Ni2P/SBA15 and WP/SBA15 have been identified as promising adsorbents especially for removing neutral nitrogen-containing compounds. Adsorption of model nitrogen- and sulfur-containing compounds as well as light cycled oil (LCO) was performed and applied for the evaluation of kinetics and isotherms. The pseudo second-order kinetic model was well fitted to both nitrogen and sulfur adsorption data. Molecular size of the adsorbates plays an important role in the adsorption. Despite of higher initial adsorption rates, the adsorption capacities for carbazole and DBT were lower than those for indole and quinoline due to their larger molecular size. Monolayer adsorption was observed for quinoline due to the acid-base interaction between the basic nitrogen adsorbate and the weak acidic support. The Freundlich model was suitable in describing the adsorption of nitrogen- and sulfur-containing compounds from LCO. Cooperative adsorption took place when replacing the model compound DBT by the sulfur-containing compounds in LCO.
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18

Ejarque, Daniel, Teresa Calvet, Mercè Font-Bardia y Josefina Pons. "Synthesis of a Heterometallic [Zn2Ca] Pinwheel Array Stabilized by Amide-Amide Synthons". Inorganics 10, n.º 8 (14 de agosto de 2022): 118. http://dx.doi.org/10.3390/inorganics10080118.

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The rational design of heterometallic compounds bearing s-block metal ions have been a difficult task for chemists owing to their lack of preferential geometries. However, some strategies, such as the design of coordinating pockets with different sizes and/or donor atoms, have offered great results. In this work, this strategy has been tested using Ca(II) as an s-block metal ion and a compound previously obtained by our group with the formula [Zn3(μ-ACA)6(4-phpy)2], which contains tetrahedral N,O- and octahedral O-coordinating pockets as a model structure. From this work, the corresponding heterometallic compound with the formula [Zn2Ca(μ-ACA)6(4-phpy)2]·EtOH (1) has been successfully synthesized, and fully characterized, and its crystal structure has been elucidated. Furthermore, we have compiled all the crystal structures containing [Zn2M] pinwheel secondary building units (SBUs), where M stands for an s-block metal ion, and the observed tendencies, as well as the promising applications as template SBUs for the preparation of 1D–3D coordination polymers, have been discussed. Finally, solid-state UV-Vis and photoluminescence have been recorded and compared with the homometallic [Zn3(μ-ACA)6(4-phpy)2] compound.
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19

Liu, Guo-Cheng, Nai-Li Chen, Ju-Wen Zhang, Yun Qu, Hong-Yan Lin y Xin-Jie Gao. "Effects of Metal Ions and N-Donor Ligands with Different Coordination Characters on the Construction of d10 Metal-organic Complexes with Selective Photocatalytic Activities". Zeitschrift für Naturforschung B 69, n.º 6 (1 de junio de 2014): 681–90. http://dx.doi.org/10.5560/znb.2014-3326.

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Four new d10 metal-organic coordination polymers, [Zn(L)(phen)(H2O)] (1), [Cd(L)(phen)] (2), [Zn(L)(bppdc)]·3H2O (3), and [Cd(L)(bppdc)]·3H2O (4) [L=2-carboxymethylsulfanyl nicotinic acid, phen=1,10-phenanthroline, bppdc=N;N`-bis(pyridin-3-yl)pyridine-2,6-dicarboxamide], have been obtained from hydrothermal reactions of zinc(II)=cadmium(II) nitrates with the semi-rigid N-= S-containing dicarboxylate L, and the two structurally disparate neutral N-donor ligands phen and bppdc. Single-crystal X-ray diffraction analysis has revealed that compound 1 is a one-dimensional (1- D) helical coordination polymer linked by ZnII atoms and L spacers. Compound 2 features a doublechain structure connected via binuclear CdII units and pairs of L linkers. Adjacent chains of 1 and 2 are packed into 3-D supramolecular networks by hydrogen bonds and p-p stacking interactions. Compounds 3 and 4 exhibit similar 2-D (4,4)-connected wave-like networks based on linear [M-L]n and zigzag [M-bppdc]n metal-organic chains (M=ZnII for 3 and CdII for 4). The effects of metal ions and N-donor ligands with different coordination characters are discussed. Moreover, the photoluminescence properties and photocatalytic activities of compounds 1 - 4 were investigated.
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20

Demakov, Pavel A., Alena A. Vasileva, Vladimir A. Lazarenko, Alexey A. Ryadun y Vladimir P. Fedin. "Crystal Structures, Thermal and Luminescent Properties of Gadolinium(III) Trans-1,4-cyclohexanedicarboxylate Metal-Organic Frameworks". Crystals 11, n.º 11 (11 de noviembre de 2021): 1375. http://dx.doi.org/10.3390/cryst11111375.

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Four new gadolinium(III) metal-organic frameworks containing 2,2′-bipyridyl (bpy) or 1,10-phenanthroline (phen) chelate ligands and trans-1,4-cyclohexanedicarboxylate (chdc2−) were synthesized. Their crystal structures were determined by single-crystal X-ray diffraction analysis. All four coordination frameworks are based on the binuclear carboxylate building units. In the compounds [Gd2(bpy)2(chdc)3]·H2O (1) and [Gd2(phen)2(chdc)3]·0.5DMF (2), the six-connected {Ln2(L)2(OOCR)6} blocks form a 3D network with the primitive cubic (pcu) topology. In the compounds [Gd2(NO3)2(phen)2(chdc)2]·2DMF (3) and [Gd2Cl2(phen)2(chdc)2]·0.3DMF·2.2dioxane (4), the four-connected {Ln2(L)2(X)2OOCR)4} units (where X = NO3− for 3 or Cl− for 4) form a 2D square-grid (sql) network. The solid-state luminescent properties were investigated for the synthesized frameworks. Bpy-containing compound 1 shows no luminescence, possibly due to the paramagnetic quenching by Gd3+ cation. In contrast, the phenathroline-containing MOFs 2–4 possess yellow emission under visible excitation (λex = 460 nm) with the tuning of the characteristic wavelength by the coordination environment of the metal center.
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21

Atsbeha Kahsay, Berhanemeskel, Fu-Ming Wang, Alem Gebrelibanos Hailu y Chia-Hung Su. "Maleamic Acid as an Organic Anode Material in Lithium-Ion Batteries". Polymers 12, n.º 5 (13 de mayo de 2020): 1109. http://dx.doi.org/10.3390/polym12051109.

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Low-molecular-weight carbonyl-containing compounds are considered beneficial energy storage materials in alkali metal-ion/alkaline earth metal-ion secondary batteries owing to the ease of their synthesis, low cost, rapid kinetics, and high theoretical energy density. This study aims to prepare a novel carbonyl compound containing a maleamic acid (MA) backbone as a material with carbon black to a new MA anode electrode for a lithium-ion battery. MA was subjected to attenuated total reflection-Fourier-transform infrared spectroscopy, and its morphology was assessed through scanning electron microscopy, followed by differential scanning calorimetry to determine its thermal stability. Thereafter, the electrochemical properties of MA were investigated in coin cells (2032-type) containing Li metal as a reference electrode. The MA anode electrode delivered a high reversible capacity of about 685 mAh g−1 in the first cycle and a higher rate capability than that of the pristine carbon black electrode. Energy bandgap analysis, electrochemical impedance, and X-ray photoelectron spectroscopy revealed that MA significantly reduces cell impedance by reforming its chemical structure into new nitrogen-based highly ionic diffusion compounds. This combination of a new MA anode electrode with MA and carbon black can increase the performance of the lithium-ion battery, and MA majorly outweighs transitional carbon black.
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22

Reckeweg, Olaf, Armin Schulz y Francis J. DiSalvo. "Structural characterization and Raman spectrum of Cs[OCN]". Zeitschrift für Naturforschung B 75, n.º 1-2 (25 de febrero de 2020): 129–33. http://dx.doi.org/10.1515/znb-2019-0168.

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AbstractThe compound Cs[OCN] has been synthesized and its crystal structure and Raman spectrum were determined on selected single crystals. As postulated in earlier work, the title compound crystallizes isopointal to KN3 exhibiting the space group I4/mcm (no. 140, Z = 4) with the lattice parameters a = 653.79(2) and c = 799.42(5) pm. The Raman spectrum verified the nature of the triatomic moiety and shows the frequencies typical for an [OCN]− anion with Fermi resonance between the 2δ and the νsym vibrations. The undisturbed frequencies and the resulting force constants have been calculated and compared to those of other alkali metal compounds containing comparable linear triatomic anions.
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23

Galassi, Rossana, Lorenzo Luciani, Junbiao Wang, Silvia Vincenzetti, Lishan Cui, Augusto Amici, Stefania Pucciarelli y Cristina Marchini. "Breast Cancer Treatment: The Case of Gold(I)-Based Compounds as a Promising Class of Bioactive Molecules". Biomolecules 12, n.º 1 (5 de enero de 2022): 80. http://dx.doi.org/10.3390/biom12010080.

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Breast cancers (BCs) may present dramatic diagnoses, both for ineffective therapies and for the limited outcomes in terms of lifespan. For these types of tumors, the search for new drugs is a primary necessity. It is widely recognized that gold compounds are highly active and extremely potent as anticancer agents against many cancer cell lines. The presence of the metal plays an essential role in the activation of the cytotoxicity of these coordination compounds, whose activity, if restricted to the ligands alone, would be non-existent. On the other hand, gold exhibits a complex biochemistry, substantially variable depending on the chemical environments around the central metal. In this review, the scientific findings of the last 6–7 years on two classes of gold(I) compounds, containing phosphane or carbene ligands, are reviewed. In addition to this class of Au(I) compounds, the recent developments in the application of Auranofin in regards to BCs are reported. Auranofin is a triethylphosphine-thiosugar compound that, being a drug approved by the FDA—therefore extensively studied—is an interesting lead gold compound and a good comparison to understand the activities of structurally related Au(I) compounds.
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24

Lin, Qing, Yun He, Jian Mei Xu, Hai Fu Huang y Rui Jun Wang. "Magnetic Property Study on Multi-Metal Compounds [MA(en)x]y[Fe(CN)6]z·nH2O(MA=Co2+,Gu2+)". Applied Mechanics and Materials 184-185 (junio de 2012): 1050–53. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.1050.

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The cyano-bridged complexes [MA(en)x]y[Fe(CN)6]z·nH2O(MA=Co2+、Gu2+) have been synthesized. In the multi-metal compound [Co(en)3] [Fe(CN)6] ·6.1H2O was prepared. Infrared spectra with stretching vibration CN = 2117.27 cm-1 illustrates that there exists the bridged cyanide on the compound; the Curie temperature Ө is -8.23117 K, indicating the magnetic interaction between the metal ions in the compound is very weak.In the multi-metal compound CuII3[FeIII(CN)6]2·3NH3·6H2O, we shows firstly the coexistence of ferromagnetic order and spin-glass order.The irreversibility in the MFC/MZFC and the relaxation of MZFC suggest that the magnetic system can be visualized as containing a ferromagnetic cluster of spin below Tc, mixed with small spin-glass clusters formed below temperature Tg less than Tc. The observed magnetic properties are explained with a ferromagnetic-spin-glass phase model.
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25

Bozorov, Kh N., O. O. Mamatkarimov y B. T. Abdulazizov. "Electric and ionic conductivity of potassium antimony tungstate with addition of alkali metals". «Узбекский физический журнал» 24, n.º 2 (7 de mayo de 2022): 129–30. http://dx.doi.org/10.52304/.v24i2.332.

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The electrical conductivity of complex oxides K1-xNaxSbWO6 (0≤x≤0.6) and K1-xLixSbWO6 (0≤ x≤0.4), which have a pyrochlore-type structure, was studied. The temperature dependence of the ion permeability of the compounds and the value of the ion radius were determined. As the ion radius value of the alkali metal decreases, the value of the activation energy decreases, and the ion permeability increases. A model of ion transport has been proposed in these compounds. It was found that the compound containing Li0.4K0.6SbWO6 reaches the maximum values of electrical conductivity.
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26

Nguyen, Viet Nhan Hoa, Si Jeong Song y Man Seung Lee. "Effect of Ethylene Glycol on the Dissolution of Palladium with HCl Solution Containing Oxidizing Agents and Selective Precipitation of Pd(IV) Compound". Korean Journal of Metals and Materials 60, n.º 7 (5 de julio de 2022): 502–10. http://dx.doi.org/10.3365/kjmm.2022.60.7.502.

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There is growing interest in the recovery of pure palladium (Pd) compound from cemented Pd from spent electroplating solutions due to increasing demand for Pd, and there is considerable motivation to develop an efficient recovery process. In conventional methods of leaching Pd metal, HCl solutions containing oxidizing agents are employed. In this work, ethylene glycol (EG) replaced water as a diluent in the HCl solution containing oxidizing agents such as H2O2, NaClO and NaClO3. Leaching of the Pd metal and the subsequent precipitation of the Pd(IV) compound was investigated. Among the three kinds of oxidizing agent, NaClO3 showed the best Pd metal leaching efficiency from a metallic mixture of Pd and Zn from HCl in EG solution. The role of EG in enhancing the leaching and precipitation is discussed in light of its interaction with other components in the solutions. To precipitate the Pd(IV) compound with NH4Cl, it is important that the dissolved Pd ion exists as Pd(IV). Therefore, NaClO3 was again added to the leaching solution to verify the oxidation of Pd(II) to Pd(IV). Extra pure ammonium hexachloropalladate ((NH4)2PdCl6) was recovered by precipitation from the leaching solution of the cemented Pd under the optimum conditions. Compared to conventional HCl systems, the present process shows some advantages, by reducing both chemical dosage and energy consumption. The results confirm a process can be developed for the recovery of the Pd(IV) compound from spent electroplating solutions containing a small amount of Pd(II).
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27

Semeleva, Elena V., Ekaterina V. Blinova, Andrey V. Zaborovsky, Irina A. Gromova, Asliddin S. Shukurov, Dmitry S. Blinov, Egor A. Turovsky et al. "Metal-containing taurine compounds protect rat’s brain in reperfusion-induced injury". Research Results in Pharmacology 6, n.º 4 (20 de noviembre de 2020): 43–49. http://dx.doi.org/10.3897/rrpharmacology.6.59857.

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Introduction: The study aim was to explore a neuroprotective action of magnesium (LKhT-317) and zinc (LKhT-318) taurine salts on experimental models of reperfusion brain damage in rats and cell culture. Materials and methods: The study was performed on male Sprague Dawley rats, and rat’s hippocampal mixed neuroglial cell culture. Magnesium- (LKhT-317) and zinc-containing (LKhT-318) derivatives of taurine were studied. Reperfusion brain damage was induced 30 min after intraluminal cerebral middle artery occlusion. Severity of the injury was assessed by local blood flowmetry, neurological symptoms scaling and brain tissue staining. Levels of IL-1b, IL-10 and TNF-alpha in tissue were determined by qualitative ELISA. Caspase-3 and Bcl-2 expressions were detected by IHC. Neurons survival was assessed by cytochemistry. Cellular calcium responses were detected by fluorescent microscopy of Fura-2-containig cells. Results and discussion: Metal-containing taurine derivatives – LKhT-317 and LKhT-318 – demonstrated a sufficient neuroprotective property in rats with a reperfusion-induced brain injury. Both derivatives effectively prevented severity of the animals’ brain damage, motor deficiency, reduction of microvascular perfusion, and proinflammatory cytokines production. Magnesium-containing compound LKhT-317 was comparatively more effective than zinc-containing one. LKhT-317 possessed an anti-apoptotic action in vivo, and protected neurons from OGD-mediated cell death in mixed hippocampal culture. The aforementioned actions may be associated with an LKhT-317 inhibitory effect on NMDA-induced cellular Ca2+ response and, therefore, the anti-excitotoxic property of the compound. Conclusion: Magnesium- and zinc-containing taurine derivatives may be considered as promising neuroprotectors in the reperfusion-induced brain injury.
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28

Greenway, Gerald y Sarunyapong Pramsaneh. "The removal torque increment on metal cans containing an asphaltic pruning seal compound". Packaging Technology and Science 8, n.º 4 (julio de 1995): 195–203. http://dx.doi.org/10.1002/pts.2770080403.

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29

Wang, Di, Libo Sun, Chuanqing Hao, Yan Yan y Zhiqiang Liang. "Lanthanide metal–organic frameworks based on a 1,2,3-triazole-containing tricarboxylic acid ligand for luminescence sensing of metal ions and nitroaromatic compounds". RSC Advances 6, n.º 63 (2016): 57828–34. http://dx.doi.org/10.1039/c6ra06303a.

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A series of novel 3D lanthanide MOFs based on unsymmetrical 1,2,3-triazole-containing tricarboxylic acid ligand (H3TAIP) has been synthesized. Compound 1 [Tb(TAIP)(DMF)2] exhibits selective detection of 4-nitrotoluene and Fe3+ ion.
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30

Lee, Jong Ho, Choong Soo Chi y Han Jun Oh. "Synthesis and Kinetic of Palladium Nanotube Using Polymer Compound". Key Engineering Materials 543 (marzo de 2013): 137–40. http://dx.doi.org/10.4028/www.scientific.net/kem.543.137.

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The palladium nanotube was synthesized by template wetting and annealing process. And the activation energy for formation of the palladium metal from palladium acetate was evaluated. The activation energy was evaluated by Friedman method and the values were in the ranges between 65 and 98 kJ/mol. The diameters and lengths of synthesized palladium nanotubes ranged from 130 to 190 nm and from 2 to 3 μm, respectively. The palladium nanotubes can be successfully fabricated by the template wetting process, and the crystalline structure is confirmed by XRD. From DSC results the thermal decomposition of precursor containing palladium acetate/PLLA occurred at 248°C, which corresponds to the precipitation of palladium metal.
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31

Ouis, Sakina, Djamil Azzedine Rouag, Lamia Bendjeddou y Corinne Bailly. "Crystal structure of homodinuclear platinum complex containing a metal–metal bond bridged by hydride and phosphide ligands". Acta Crystallographica Section E Crystallographic Communications 74, n.º 7 (19 de junio de 2018): 977–80. http://dx.doi.org/10.1107/s205698901800868x.

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In the title compound, μ-diphenylphosphido-μ-hydrido-bis[bromido(triphenylphosphane-κP)platinum(II)] diethyl ether monosolvate, [Pt2Br2(C12H10P)H(C18H15P)2]·C4H10O or [Pt2(μ-H)(μ-PPh2)Br2(PPh3)2]·(C2H5)2O, the PtII atoms are coordinated in a distorted square-planar arrangement, with one hydrido and one phosphido ligand bridging in a trans position. In the lattice, C—H...·O and C—H...π interactions are present. This complex has a total number of 32 electrons, 16 electrons for each PtII atom. One of the Br atoms is disordered over two positions in a 0.92:0.08 ratio.
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32

Schreiber, A., H. Rauter, M. Krumm, S. Menzer, E. C. Hillgeris y B. Lippert. "Multinuclear Metal Nucleobase Complexes". Metal-Based Drugs 1, n.º 2-3 (1 de enero de 1994): 241–46. http://dx.doi.org/10.1155/mbd.1994.241.

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Of all properties of metal nucleobase complexes, formation of multinuclear species appears to be an outstanding feature. After a brief introduction into well known polymeric metal nucleobase complexes, three aspects recently Studied in our laboratory will be dealt with in more detail: (i) Heteronuclear complexes derived from trans-[(amine)2Pt(1-MeC)2]2+ (1-MeC=1-methylcytosine). They form, e. g. with Pd(II) or Hg(II), upon single deprotonation of the exocyclic amino group of each 1-MeC ligand, compounds of type trans-[(amine)2Pt(1-MeC-)2MY]n+, displaying Pt-M bond formation. (ii) Cyclic nucleobase complexes derived from cis-a2Pt(II). A cyclic compound of composition {[(en)Pt(UH-N1,N3)]4}4+ (UH=monoanion of unsubstituted uracil) is presented and the analogy with organic calix-[4]-arenes is pointed out. (iii) Cyclic nucleobase complexes from trans-a2Pt(II). Possible ways for the preparation of macrocyclic nucleobase complexes containing trans-a2Pt(II) linkages are outlined and precursors and intermediates are presented.
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33

Evseev, Andrey V., Dmitrij V. Surmenev, Edgar A. Parfenov, Marina A. Evseeva, Denis V. Sosin, Yana V. Tishkova y Ekaterina O. Markova. "Testing of new selenium containing metal complex compounds by acute hypoxia-hypercapnia method". Reviews on Clinical Pharmacology and Drug Therapy 15, n.º 4 (15 de diciembre de 2017): 46–52. http://dx.doi.org/10.17816/rcf15446-52.

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Aim. To test the new selenium containing metal complex (Zn2+) compounds by acute hypoxia-hypercapnia method in experiments on mice for antihypoxic effect finding. Methods. The screening of antihypoxants in experiments on mice placed in acute hypoxia-hypercapnia condition (AH + H) among 11 new metal complex selenium containing compounds have been performed. Condition of AH + H in animals was formed by their placing in hermetic glass boxes with 0.25 L free volume. Each substance has been used once by intraperitoneal introduction 60 min. before mice placing in AH + H area in doses 10, 25, and 50 mg/kg. The “life span” parameter was used as a criterion of antihypoxic activity. At the definite steps of investigation all animals where undergone to rectal temperature measuring. Results. The antihypoxic effect was shown by 4 compounds among 11 (πQ2719, πQ2720, πQ2721, πQ2882). The greatest result in life span was found in substance πQ2721. In this case the right positive interaction between doses of substances and results was marked - doses 10, 25 and 50 mg/kg provide life span enlargements to 25.1, 81.7 (р < 0.05), and 186.1% (р < 0.005) in comparison with control groups correspondently. The efficiency of etalon substance πQ1983 was near to that of πQ2721 but in dose 50 mg/kg it becomes weaker in activity than new compound. Conclusion. The test resultant of 11 new metal complex (Zn2+) substance with selenium in structure of ligand in use of acute hypoxia-hypercapnia method shows the πQ2721 as an antihypoxant that was confirmed by significant mice life span enlargement after doses 25 and 50 mg/kg during its action that according with dose-dependent rectal temperature decrease. (For citation: Yevseyev AV, Surmenev DV, Parfenov EA, et al. Testing of new selenium containing metal complex compounds by acute hypoxia-hypercapnia method. Reviews on Clinical Pharmacology and Drug Therapy. 2017;15(4):46-52. doi: 10.17816/RCF15446-52).
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34

Camargo, Mariana Leticia Munin, Cristiane Storck Schwalm, Tanize Bortolotto, Natália de Freitas Daudt, Grazielle Guidolin Rossi, Marli Matiko Anraku de Campos, Kaique Alexandre D’Oliveira, Alexandre Cuin y Vânia Denise Schwade. "MII (M = Mn, Fe, Co, Ni and Cu) complexes with a chromone-derived neutral ligand: synthesis, structural characterization, photocatalytic and mycobacterial activity studies". New Journal of Chemistry 46, n.º 5 (2022): 2534–45. http://dx.doi.org/10.1039/d1nj05011g.

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This work provides the coordination chemistry of the resulting compound of 2-(2-furyl)-3-hydroxychromone and nicotinoyl chloride with first row transition metal ions. Good performance in H2 evolution was shown by the copper-containing photocatalyst.
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35

Wu, Yarong, Xiang Zhou, Zhiqi Xing y Jiangtao Ma. "Metal compounds as catalysts in the intumescent flame retardant system for polyethylene terephthalate fabrics". Textile Research Journal 89, n.º 15 (9 de octubre de 2018): 2983–97. http://dx.doi.org/10.1177/0040517518805373.

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Forming a carbonaceous protective layer during combustion has been proven to be an effective way to improving the flame retardancy of polymers and it has been found that some metal compounds could promote dehydrogenation and aromatization of the degradation products. In this research, several divalent or multivalent metal compounds were added in the intumescent flame retardant (IFR) based on ammonium polyphosphate, pentaerythritol and melamine for polyethylene terephthalate (PET) fabrics. The prepared flame retardant dispersions containing 25 wt% IFR and 1 wt% metal compounds were applied on PET fabrics by the common pad-dry-cure method. None of the treated samples generated any dripping during the vertical burning test, with the highest limiting oxygen index being up to 33.4%. Thermogravimetric analysis showed that the catalytic effect of metal compounds may occur in promoting the formation of char residues. The morphology of char residues of two of the IFR/metal compound-treated PET fabrics, IFR/FeCl3 and IFR/ZnCl2, were smooth and compact, as shown by scanning electron microscopy. Laser Raman spectroscopy of the char residues suggested that a higher graphitization degree was obtained by adding the metal compounds. Real-time Fourier transform infrared spectroscopy showed that metal compounds made more phosphorus available for phosphorylation and char formation. The results of the present study indicate the possibility for enhancing char formation via the catalytic effect of metal compounds to improve the flame retardant and anti-dripping properties of the PET fabrics.
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36

Mohd Zaid, Hayyiratul Fatimah, Chong Fai Kait y Mohamed Ibrahim Abdul Mutalib. "Photo Oxidative Extractive Desulfurization of Model Oil Using Fe/TiO2 Photocatalyst and Eutectic Based Ionic Liquid: Effect of Metal Loading". Advanced Materials Research 1133 (enero de 2016): 664–68. http://dx.doi.org/10.4028/www.scientific.net/amr.1133.664.

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Titanium dioxide (TiO2) photocatalyts doped with iron metal at different metal loadings were successfully prepared and characterized. The doped photocatalyst were characterized using diffuse reflectance spectroscopy (DR-UV-Vis), X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM).Photooxidative extractive desulfurization of model oil containing dibenzothiophene as the sulfur compound (100ppm) was investigated using the prepared photocatalyst. The photocatalyst with 0.20 wt% Fe metal loading showed the best sulfur removal at 61.13%.
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37

Wang, Xiu-Li, Na Li, Ai-Xiang Tian, Jun Ying, Guo-Cheng Liu, Hong-Yan Lin y Dan Zhao. "Three 3D Metal-Organic Frameworks Constructed from Keggin Polyanions and Multi-nuclear AgI Clusters: Assembly, Structures and Properties". Zeitschrift für Naturforschung B 68, n.º 7 (1 de julio de 2013): 778–88. http://dx.doi.org/10.5560/znb.2013-3007.

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Three Keggin-based metal-organic frameworks (MOFs) containing multi-nuclear silver subunits, [Ag7(ptz)5(H2O)2][H2SiMo12O40] (1), [Ag8(ptz)5(H2O)2][AsW12O40] (2) and [Ag7(ptz)5(H2O)][HAsMo12O40] (3) (ptzH=5-(4-pyridyl)-tetrazole), have been synthesized under hydrothermal conditions by changing the inorganic polyanions. The new compounds have been characterized by elemental analyses, TG analyses, IR spectroscopy, and single-crystal X-ray diffraction. In compound 1, the multi-nuclear Ag5(ptz)5 subunits are interconnected to form chains, which are further linked by AgI cations to construct a 3D MOF with large channels. Pairs of SiMo12O404- polyanions reside in the channels as penta-dentate inorganic ligands. In 2, six AgI cations link five ptz- anions to construct a hexa-nuclear subunit [Ag6(ptz)5]+, which is interconnected to form chains. These chains are further linked by AgI cations to construct a 3D MOF, where AsW12O403- polyanions reside as hexa-dentate ligands. Compound 3exhibits a 3D MOF based on Ag5(ptz)5 subunits, in which the hexa-dentate AsMo12O403- polyanions are incorporated. The rigid tetrazole-based ligand ptz- plays an important role in the formation of the multi-nuclear subunits of the title compounds. The electrochemical properties of compound 1and the photocatalytic properties of compounds 1and 3have been investigated.
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38

Varlakov, A. P., A. A. Zherebtsov, A. V. Germanov, M. A. Mariakhin, G. A. Varlakova, V. G. Petrov, S. N. Kalmykov y M. K. Krapivina. "Radioactive waste cementation via the in-container hot pressing method". Radioactive Waste 20, n.º 3 (2022): 19–29. http://dx.doi.org/10.25283/2587-9707-2022-3-19-29.

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The paper explores mechanical, physical, chemical and structural properties of cement compounds based on blastfurnace slag produced in metal containers using the hot isostatic pressing (HIP) method. The study allowed to evaluate the radiation resistance of cement compounds under the influence of ionizing radiation up to an absorbed dose of 109 Gy and 1019 alpha-dispersion/g. The tests confirmed that the matrices complied with the established regulatory requirements. It was demonstrated that cement compound synthesis based on the HIP method provided matrices with enhanced physical and chemical characteristics. It was also shown that under radiation exposure, cement compounds containing high-level waste simulators retained their properties and structure.
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39

Andika Putri, Novita Rusmayanti, Yeti Kurniasih y Ahmadi Ahmadi. "PENGARUH PERBANDINGAN KONSENTRASI TBP : D2EHPA DAN KONSENTRASI PENGEMBAN DALAM FASAORGANIK PADA EKSTRAKSI PERAK DARI LIMBAH FOTO ROENTGEN". Hydrogen: Jurnal Kependidikan Kimia 4, n.º 2 (17 de diciembre de 2016): 87. http://dx.doi.org/10.33394/hjkk.v4i2.92.

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Photo roentgen used for examination of internal organs can produce wastes that are harmful to health and the environment because they containing silver metal ion(Ag+) inform of silver thiosulfate complex ([Ag(S2O3)2]-3). Therefore it was necessary for the separation of Ag metal so that the metal does not pollute the environment and can be used economically. One way to separate the metal Ag is by solvent extraction techniques. This study aimed to determine the effect of concentration ratio of TBP:D2EHPA and carrier compound concentration in the organic phase of the percent extraction of silver metal then applied to the sample photo roentgen waste. Extraction of the metals Ag done by varying the ratio of the combined carrier concentration of TBP and D2EHPA in kerosene by concentration ratio was 0: 1; 0.25: 0.75; 0.5: 0.5; 0.75: 0.25 and 1: 0 M as well as by varying the carrier concentration in the organic phase ranging from 0 M; 0.5 M; 1 M and 1.5 M. Measuring the concentration of metal ions Ag+in water phase before and after extraction was determined by atomic absorptionspectrophotometer (AAS) at a wavelength of 328,22 nm then calculated percent extraction. Based on the research that obtained the highest percent extraction on single used carrier compounds and compound concentration carrier D2EHPA in optimum water was 0.5 M with 58.22% percent extraction. Applications optimum conditions to the extraction of silver metal obtained from photo roentgenwaste percent extraction was 10.27%.
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40

Fujii, Kenji, Junji Sugishita, Noboru Egami y Minoru Tabata. "Friction and Wear of Aluminum Alloys Containing Hard Phases". Journal of Tribology 117, n.º 2 (1 de abril de 1995): 321–27. http://dx.doi.org/10.1115/1.2831250.

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Adhesion energy between two surfaces containing intermetallic compounds is low, and adhesive wear is expected to be inhibited in such materials. Accordingly, the effects of intermetallic compounds have to be taken into account in the material design stage as a measure for improving wear resistance. Wear tests for specimens containing intermetallic compound phases, such as FeAl, TiAl and NiAl, were carried out under dry and lubricated conditions. The composite specimens used for the tests were fabricated by using a centrifugal casting method. In dry sliding of iron-aluminide composite materials, adhesion was mitigated and specific wear rate decreased with increases in the area fraction up to 60 percent. The titanium aluminide composite material showed the same trend of wear as that of the iron-aluminide composite materials. Under lubrication, specific wear rates increased due to the surface containing brittle intermetallic compounds. For the nickel aluminide composite material, the adhesion-inhibiting effect was remarkable. For particle reinforced metal matrix composites, friction coefficients depend on the protrusion height of alumina particles from the surface. The coefficient of friction for the surface with particles protruding was higher than that for the surface with embedded particles.
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41

Mousaa, Issa y Hamdi Radi. "New corrosion inhibitors based on epoxidized natural rubber for coating protection of metals under UV irradiation". Anti-Corrosion Methods and Materials 64, n.º 4 (5 de junio de 2017): 389–96. http://dx.doi.org/10.1108/acmm-01-2016-1628.

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Purpose In the present work, under severe conditions of an inert atmosphere and high temperature, epoxidized natural rubber (ENR) with 25 per cent epoxidation level reacts with different aliphatic amine compounds such as ethyl amine (EA), propyl amine (PA) and butyl amine (BA) to prepare ENR/EA, ENR/PA, ENR/BA compounds as, respectively. The produced compounds were characterized by Fourier transform infrared spectroscopy and oxirane oxygen content determination. Different concentrations of the produced compounds were added to epoxy and urethane acrylate coating formulations to evaluate them as corrosion inhibitors for mild steel under UV irradiation. Corrosion resistance tests and weight loss measurements of the coated steel panels were made. It was found that coating formulations containing the prepared ENR/EA compound could protect metal surface from corrosion, and corrosion inhibitors efficiency of the prepared compounds were arranged as follows: ENR/EA > ENR/PA > ENR/BA. The optimum concentrations for all inhibitors which give the best inhibition efficiency for corrosion are 0.4-0.6 phr. Design/methodology/approach Corrosion scratch tests were carried out according to ASTM D 1,654-92 (2000). The weight loss of coated steel was measured according to ASTM D 2,688-94 (1999). The measurement of film hardness was carried out with a Wolff–Wilborn pencil hardness tester according to ASTM D 3,363 (2000). Findings It was found that coating formulations containing the prepared ENR/EA compound could protect metal surface from corrosion and corrosion inhibitors efficiency of the prepared compounds were arranged as follows: ENR/EA > ENR/PA > ENR/BA. The optimum concentrations for all inhibitors are 0.4-0.6 g/100g coating. Originality/value A highly efficient and economically corrosion inhibitors for mild steel were prepared from ENR and series of aliphatic amines.
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42

Rosnes, Mali H., Martin Opitz, Matthias Frontzek, Wiebke Lohstroh, Jan Peter Embs, Peter A. Georgiev y Pascal D. C. Dietzel. "Intriguing differences in hydrogen adsorption in CPO-27 materials induced by metal substitution". Journal of Materials Chemistry A 3, n.º 9 (2015): 4827–39. http://dx.doi.org/10.1039/c4ta05794e.

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We present a comparative study of hydrogen gas adsorption experiments on CPO-27–Cu and –Mn. The initial isosteric heat of adsorption in CPO-27–Cu is low for a material containing open metal sites and in contrast to the other members of the CPO-27 series, including the Mn compound.
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43

Cañadillas-Delgado, Laura, Óscar Fabelo, Jorge Pasán, Mariadel Déniz, Carla Martínez-Benito, Pau Díaz-Gallifa, Tomás Martín y Catalina Ruiz-Pérez. "Three new europium(III) methanetriacetate metal-organic frameworks: the influence of synthesis on the product topology". Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 70, n.º 1 (16 de enero de 2014): 19–27. http://dx.doi.org/10.1107/s2052520613034550.

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Three new metal-organic framework structures containing EuIIIand the little explored methanetriacetate (C7H7O63−, mta3−) ligand have been synthesized. Gel synthesis yields a two-dimensional framework with the formula [Eu(mta)(H2O)3]n·2nH2O, (I), while two polymorphs of the three-dimensional framework material [Eu(mta)(H2O)]n·nH2O, (II) and (III), are obtained through hydrothermal synthesis at either 423 or 443 K. Compounds (I) and (II) are isomorphous with previously reported GdIIIcompounds, but compound (III) constitutes a new phase. Compound (I) can be described in terms of dinuclear [Eu2(H2O)4]6+units bonded through mta3−ligands to form a two-dimensional framework with topology corresponding to a (6,3)-connected binodal (43)(466683)-kgdnet, where the dinuclear [Eu2(H2O)4]6+units are considered as a single node. Compounds (II) and (III) have distinct three-dimensional topologies, namely a (41263)(4966)-nianet for (II) and a (41065)(41164)-K2O2; 36641net for (III). The crystal density of (III) is greater than that of (II), consistent with the increase of temperature, and thereby autogeneous pressure, in the hydrothermal synthesis.
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44

Tramšek, Melita, Primož Benkič y Boris Žemva. "The First Compound Containing a Metal Center in a Homoleptic Environment of XeF2 Molecules". Angewandte Chemie International Edition 43, n.º 26 (28 de junio de 2004): 3456–58. http://dx.doi.org/10.1002/anie.200453802.

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45

Tramšek, Melita, Primož Benkič y Boris Žemva. "The First Compound Containing a Metal Center in a Homoleptic Environment of XeF2 Molecules". Angewandte Chemie 116, n.º 26 (28 de junio de 2004): 3538–40. http://dx.doi.org/10.1002/ange.200453802.

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46

Nizam El-Din, H. M. M., M. S. Ibrahim y M. M. Mostafa. "New hydrogel containing sulfur compound prepared by ? irradiation and its application for metal recovery". Journal of Applied Polymer Science 77, n.º 5 (2000): 955–66. http://dx.doi.org/10.1002/1097-4628(20000801)77:5<955::aid-app2>3.0.co;2-f.

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47

Murakami, Y., K. Esumi y H. Honda. "Preparation and characterization of an electrocatalytic electrode using amphiphilic carbonaceous material containing metal compound". Carbon 34, n.º 4 (1996): 463–70. http://dx.doi.org/10.1016/0008-6223(95)00196-4.

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48

Knopf, Kevin M., Guy Crundwell y Barry L. Westcott. "Crystal structure of hexaaquadichloridoytterbium(III) chloride". Acta Crystallographica Section E Crystallographic Communications 71, n.º 6 (7 de mayo de 2015): i5. http://dx.doi.org/10.1107/s2056989015008488.

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The crystal structure of the title compound, [YbCl2(H2O)6]Cl, was determined at 110 K. Samples were obtained from evaporated acetonitrile solutions containing the title compound, which consists of a [YbCl2(H2O)6]+cation and a Cl−anion. The cations in the title compound sit on a twofold axis and form O—H...Cl hydrogen bonds with the nearby Cl−anion. The coordination geometry around the metal centre forms a distorted square antiprism. The ytterbium complex is isotypic with the europium complex [Tambrorninoet al.(2014).Acta Cryst.E70, i27].
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49

Kostrzewa, Tomasz, Jakub Jończyk, Joanna Drzeżdżon, Dagmara Jacewicz, Magdalena Górska-Ponikowska, Marcin Kołaczkowski y Alicja Kuban-Jankowska. "Synthesis, In Vitro, and Computational Studies of PTP1B Phosphatase Inhibitors Based on Oxovanadium(IV) and Dioxovanadium(V) Complexes". International Journal of Molecular Sciences 23, n.º 13 (24 de junio de 2022): 7034. http://dx.doi.org/10.3390/ijms23137034.

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One of the main goals of recent bioinorganic chemistry studies has been to design and synthesize novel substances to treat human diseases. The promising compounds are metal-based and metal ion binding components such as vanadium-based compounds. The potential anticancer action of vanadium-based compounds is one of area of investigation in this field. In this study, we present five oxovanadium(IV) and dioxovanadium(V) complexes as potential PTP1B inhibitors with anticancer activity against the MCF-7 breast cancer cell line, the triple negative MDA-MB-231 breast cancer cell line, and the human keratinocyte HaCaT cell line. We observed that all tested compounds were effective inhibitors of PTP1B, which correlates with anticancer activity. [VO(dipic)(dmbipy)]·2 H2O (Compound 4) and [VOO(dipic)](2-phepyH)·H2O (Compound 5) possessed the greatest inhibitory effect, with IC50 185.4 ± 9.8 and 167.2 ± 8.0 nM, respectively. To obtain a better understanding of the relationship between the structure of the examined compounds and their activity, we performed a computer simulation of their binding inside the active site of PTP1B. We observed a stronger binding of complexes containing dipicolinic acid with PTP1B. Based on our simulations, we suggested that the studied complexes exert their activity by stabilizing the WPD-loop in an open position and limiting access to the P-loop.
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50

Khan, Saeed I., Peter G. Edwards, Hanna S. H. Yuan y Robert Bau. "Structures of the copper-containing Cu4MgPh6 and [Cu4LiPh6]- clusters: first example of a magnesium-containing transition-metal cluster compound". Journal of the American Chemical Society 107, n.º 6 (marzo de 1985): 1682–84. http://dx.doi.org/10.1021/ja00292a036.

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