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Articles de revues sur le sujet « Organic metal complexes »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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1

Nabeshima, Tatsuya, Yusuke Chiba, Takashi Nakamura et Ryota Matsuoka. « Synthesis and Functions of Oligomeric and Multidentate Dipyrrin Derivatives and their Complexes ». Synlett 31, no 17 (24 juillet 2020) : 1663–80. http://dx.doi.org/10.1055/s-0040-1707155.

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The dipyrrin–metal complexes and especially the boron complex 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) have recently attracted considerable attention because of their interesting properties and possible applications. We have developed two unique and useful ways to extend versatility and usefulness of the dipyrrin complexes. The first one is the linear and macrocyclic oligomerization of the BODIPY units. These arrangements of the B–F moieties of the oligomerized BODIPY units provide sophisticated functions, such as unique recognition ability toward cationic guest, associated with changes in the photophysical properties by utilizing unprecedented interactions between the B–F and a cationic species. The second one is introduction of additional ligating moieties into the dipyrrin skeleton. The multidentate N2Ox dipyrrin ligands thus obtained form a variety of complexes with 13 and 14 group elements, which are difficult to synthesize using the original N2 dipyrrin derivatives. Interestingly, these unique complexes exhibit novel structures, properties, and functions such as guest recognition, stimuli-responsive structural conversion, switching of the optical properties, excellent stability of the neutral radicals, etc. We believe that these multifunctional dipyrrin complexes will advance the basic chemistry of the dipyrrin complexes and develop their applications in the materials and medicinal chemistry fields.1 Introduction2 Linear Oligomers of Boron–Dipyrrin Complexes3 Cyclic Oligomers of Boron–Dipyrrin Complexes4 A Cyclic Oligomer of Zinc–Dipyrrin Complexes5 Group 13 Element Complexes of N2Ox Dipyrrins6 Chiral N2 and N2Ox Dipyrrin Complexes7 Group 14 Element Complexes of N2O2 Dipyrrins8 Other N2O2 Dipyrrin Complexes with Unique Properties and Functions9 Conclusion
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Sacarescu, Liviu, Rodinel Ardeleanu, Gabriela Sacarescu, Mihaela Simionescu et Ionel Mangalagiu. « Polysilane–Metal Complexes for Organic Semiconductors ». High Performance Polymers 19, no 5-6 (octobre 2007) : 501–9. http://dx.doi.org/10.1177/0954008306081193.

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New polysilane-metal complexes structures were obtained by the polycondensation reaction of α,ω-bis(chloromethyl)-polymethylphenylsilane with the Ni (II) complex of bis(salicylidene)ethylenedia-mine (salen). The chloro-functionalized polysilane was obtained by a modified Wurtz coupling procedure at low temperatures. To obtain the polymer-metal complex the resulted macroligand was complexed with metal cations. This structure is characterized by a highly localized electroactivitry in the redox moiety combined with a specific σ conjugative effect in the polysilane chain. Infrared, 1H NMR and UV-vis spectral analysis as well as gel permeation chromatography and thermogravimetric analysis were used to investigate the new chemical structures.
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Gonzalez, A., J. Marquet et M. Moreno-Mañas. « Metal complexes in organic synthesis. » Tetrahedron 42, no 15 (janvier 1986) : 4253–57. http://dx.doi.org/10.1016/s0040-4020(01)87650-x.

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Sumrra, Sajjad Hussain, Muhammad Ibrahim, Sabahat Ambreen, Muhammad Imran, Muhammad Danish et Fouzia Sultana Rehmani. « Synthesis, Spectral Characterization, and Biological Evaluation of Transition Metal Complexes of Bidentate N, O Donor Schiff Bases ». Bioinorganic Chemistry and Applications 2014 (2014) : 1–10. http://dx.doi.org/10.1155/2014/812924.

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New series of three bidentate N, O donor type Schiff bases(L1)–(L3)were prepared by using ethylene-1,2-diamine with 5-methyl furfural, 2-anisaldehyde, and 2-hydroxybenzaldehyde in an equimolar ratio. These ligands were further complexed with Co(II), Cu(II), Ni(II), and Zn(II) metals to produce their new metal complexes having an octahedral geometry. These compounds were characterized on the basis of their physical, spectral, and analytical data. Elemental analysis and spectral data of the uncomplexed ligands and their metal(II) complexes were found to be in good agreement with their structures, indicating high purity of all the compounds. All ligands and their metal complexes were screened for antimicrobial activity. The results of antimicrobial activity indicated that metal complexes have significantly higher activity than corresponding ligands. This higher activity might be due to chelation process which reduces the polarity of metal ion by coordinating with ligands.
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Mamedova, Shafa Agаеvna. « METAL COMPLEX CATALYSIS ». Globus 7, no 5(62) (4 août 2021) : 31–33. http://dx.doi.org/10.52013/2658-5197-62-5-7.

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Complexes of transition metals with chiral ligands are considered as catalysts. Among metal-containing organic complexes with semiconducting properties, compounds of the porphin series occupy a special place in electrocatalytic studies. The properties of the porphyrin macrocycle, their role in catalysis, and the influence of the nature of the metal on the catalytic properties of the complex are considered.
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Sun, Yimeng, Wei Xu, Chong-an Di et Daoben Zhu. « Metal-organic complexes-towards promising organic thermoelectric materials ». Synthetic Metals 225 (mars 2017) : 22–30. http://dx.doi.org/10.1016/j.synthmet.2016.12.001.

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Maurya, Chandan, et Sangeeta Bajpai. « Biological Applications of Metal Complexes of Dithiocarbamates ». Journal of Applied Science and Education (JASE) 2, no 1 (1 mars 2022) : 1–16. http://dx.doi.org/10.54060/jase/002.01.002.

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Dithiocarbamates are organosulphur ligands and form chelate compounds with metals. Their uses are reported in the field of accelerating vulcanization, pesticide, material science, organic synthesis, etc. Recent research demonstrated the potential of metal complexes of these ligands as good antifungal, antibacterial, and antitumor agents. Dithiocarbamate complexes have also been reported to use as a plasmonic sensor, as an inhibitor of proteasome, and for antioxidant and antileishmanial activity. This brief review presents the biological activities of metal complexes of dithiocarbamate.
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Saito, Gunzi, et Tsuyoshi Murata. « Mixed valency in organic charge transfer complexes ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 366, no 1862 (10 septembre 2007) : 139–50. http://dx.doi.org/10.1098/rsta.2007.2146.

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Mixed-valence (partial charge transfer state) and segregated stacking are the key factors for constructing organic metals. Here, we discuss the ionicity phase diagrams for a variety of charge transfer systems to provide a strategy for the development of functional organic materials (Mott insulator, semiconductor, superconductor, metal, complex isomer, neutral–ionic system, etc.).
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Dong, Jinqiao, Yan Liu et Yong Cui. « Supramolecular Chirality in Metal–Organic Complexes ». Accounts of Chemical Research 54, no 1 (18 décembre 2020) : 194–206. http://dx.doi.org/10.1021/acs.accounts.0c00604.

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Kasatkin, A. N., T. Yu Romanova, O. Yu Tsypyshev, G. A. Tolstikov et S. I. Lomakina. « Transition metal ?-complexes in organic synthesis ». Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 38, no 11 (novembre 1989) : 2410–15. http://dx.doi.org/10.1007/bf01168100.

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Platero-Prats, Ana E., Antonio Bermejo Gómez, Karena W. Chapman, Belén Martín-Matute et Xiaodong Zou. « Functionalising metal–organic frameworks with metal complexes : the role of structural dynamics ». CrystEngComm 17, no 40 (2015) : 7632–35. http://dx.doi.org/10.1039/c5ce01732g.

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The impact of dynamics in the functionalisation of metal–organic framework UiO-67 with an Ir-complex has been studied. Highly functionalised Ir-UiO-67 can be only trapped as kinetic products, which lose metals and exchange species to gain stability.
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Salassa, Giovanni, et Alessio Terenzi. « Metal Complexes of Oxadiazole Ligands : An Overview ». International Journal of Molecular Sciences 20, no 14 (16 juillet 2019) : 3483. http://dx.doi.org/10.3390/ijms20143483.

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Oxadizoles are heterocyclic ring systems that find application in different scientific disciplines, from medicinal chemistry to optoelectronics. Coordination with metals (especially the transition ones) proved to enhance the intrinsic characteristics of these organic ligands and many metal complexes of oxadiazoles showed attractive characteristics for different research fields. In this review, we provide a general overview on different metal complexes and polymers containing oxadiazole moieties, reporting the principal synthetic approaches adopted for their preparation and showing the variety of applications they found in the last 40 years.
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Morrison, G. M. P., D. M. Revitt et J. B. Ellis. « Metal Speciation in Separate Stormwater Systems ». Water Science and Technology 22, no 10-11 (1 octobre 1990) : 53–60. http://dx.doi.org/10.2166/wst.1990.0288.

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Biogeochemical processes, affecting metal speciation in a gullypot system and at stormwater outfalls, are investigated. Ionic Pb and Cu species released from road sediments by add rain are scavenged by dissolved organic material and suspended solids as a result of a rise in pH through the road/gullypot system. Cadmium and Zn tend to remain in the dissolved phase. Bacterial activity and add dissolution produce increases in dissolved metal in the gullypot liquor and it is these metals which contribute to the early storm profile. Metals in basal gullypot sediments are readily mobilised during high volume/intensity storms. The resulting stormwater contains dissolved ionic forms of Cd and Zn, while Pb is mostly adsorbed to suspended solid surfaces. Copper also binds to solids, although approximately 50% is transported by dissolved organic material (molecular weight ≈ 1000-5000). For the separation of directly toxic metal species, anodic stripping voltammetry at polymer coated electrodes is preferred. Lead and Cu are present as iron/humic colloids and organic complexes respectively, which are not directly toxic to algae. Cadmium is predominantly ionic and inorganically complexed and therefore directly toxic. It is recommended that the highly toxic lipid soluble metal species should be analysed in stormwater.
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Sanz, Roberto, et Raquel Hernández-Ruiz. « Dichlorodioxomolybdenum(VI) Complexes : Useful and Readily Available Catalysts in Organic Synthesis ». Synthesis 50, no 20 (5 septembre 2018) : 4019–36. http://dx.doi.org/10.1055/s-0037-1610236.

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Molybdenum(VI) dichloride dioxide (MoO2Cl2), and its addition complexes [MoO2Cl2(L)n; L = neutral ligand], are commercially or easily available and inexpensive transition-metal complexes based on a non-noble metal that can be applied as catalysts for various organic transformations. This short review aims to present the most significant breakthroughs in this field.1 Introduction2 Preparation and Reactivity of MoO2Cl2(L)n Complexes2.1 Synthesis and Structure2.2 Reactivity of Dichlorodioxomolybdenum(VI) Complexes3 Redox Processes Catalyzed by MoO2Cl2(L)n Complexes3.1 Deoxygenation Reactions Using Phosphorus Compounds3.2 Deoxygenation and Hydrosilylation Reactions Using Silanes3.3 Reduction Reactions Using Hydrogen3.4 Deoxygenation Reactions with Boranes and Thiols3.5 Reduction Reactions with Glycols3.6 Oxidation Reactions4 Ambiphilic Reactivity of MoO2Cl2 4.1 Amphoteric Lewis Acid–Lewis Base Catalyzed Reactions4.2 Lewis Acid Type Catalyzed Reactions5 Conclusion and Perspective
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Pérez, Julio, et Lucía Riera. « Stable metal–organic complexes as anion hosts ». Chemical Society Reviews 37, no 12 (2008) : 2658. http://dx.doi.org/10.1039/b707074h.

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Eisch, John J., James E. Galle, Allen A. Aradi et Marek P. Bolesa̵wski. « Organic chemistry of subvalent transition metal complexes ». Journal of Organometallic Chemistry 312, no 3 (octobre 1986) : 399–416. http://dx.doi.org/10.1016/0022-328x(86)80327-8.

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Blagg, Julian. « Stoichiometric organotransition metal complexes in organic synthesis ». Contemporary Organic Synthesis 2, no 1 (1995) : 43. http://dx.doi.org/10.1039/co9950200043.

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Цивцивадзе Тенгиз Иванич, Брегадзе Нестан Левановна, Чигогидзе Нодар Шалвович et Дидбаридзе Изольда Сардионовна. « ИК-СПЕКТРОСКОПИЧЕСКОЕ ИССЛЕДОВАНИЕ СТРУКТУРЫ БИОКОМПЛЕКСНЫХ СОЕДИНЕНИЙ МЕТАЛЛОВ С НАКСОДЖИНОМ ». International Academy Journal Web of Scholar 1, no 11(41) (30 novembre 2019) : 10–16. http://dx.doi.org/10.31435/rsglobal_wos/30112019/6802.

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During researching the spectra of biocomplexes of synthesized metals synthesized by us with the organic laxand Naxogin (nimorazole), we compared the spectra of the obtained complexes with the ir-spectra of free (uncoordinated) naxogin (nimorazole). The research showed that the stretching vibration frequencies υ(C=N) were A~10–25 cm-1 in the high- frequency region and rarely in the higher metallicity (but in the acceptable range), which indicates that naxogin is present in these metal complexes (nimorazole). In a coordinated state through one of the two nitrogen atoms of the imidazole cycle. Comparisons were also made with the spectra of noxogenic (nimorazole) metal complexes (manganese, cobalt, nickel, copper, zinc) and other metals chromium(II), iron(II) and iron(III), which convinced us that organic ligands were only centrally connected with the complexes atoms.
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Higgins, HW, et DJ Mackey. « Role of Ecklonia radiata (C. Ag.) J. Agardh in determining trace metal availability in coastal waters. II. Trace metal speciation ». Marine and Freshwater Research 38, no 3 (1987) : 317. http://dx.doi.org/10.1071/mf9870317.

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Detrital decomposition of the kelp E. radiata leads to the leaching of substantial amounts of trace metals and dissolved organic carbon (DOC). About 15% of the total Fe, 30% of Cu and Mn, 80% of Zn and Cd, and 25% of the DOC were released. The holdfast was more resistant to decomposition than the other tissues. The high absolute concentration of Fe in E. radiata ensured that it was the predominant metal in the leachates. The DOC released contained organic ligands that were capable of forming strong complexes with Cu, Fe and Zn, and the complexing capacity of the DOC exceeded the total amount of these metals released during leaching. The copper complexing capacity of the leachate (15 nmol mg-1 DOC) is comparable to the copper complexing capacity of Australian coastal waters. Exudation of DOC by living E. radiata plants also results in the release by ligands with strong metal complexing abliity. Fractionation of the leachates by reverse-phase chromatography confirmed that Cu, Fe and Zn were present as metal-organic complexes. These complexes were generally of high polarity. Polyphenolic compounds were an important component of the exudate but HPLC analysis indicated that other complexing agents also occurred. E. radiata beds may play a major role in regulating both the concentration and speciation of heavy metals in nearshore environments.
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Abd El-Hameed, Faten S. M. « TELLURITO COMPLEXES : BASIC METAL PYROTELLURITO COMPLEXES ». Phosphorus, Sulfur, and Silicon and the Related Elements 119, no 1 (décembre 1996) : 241–48. http://dx.doi.org/10.1080/10426509608043481.

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Samanta, Soumen K. « Metal Organic Polygons and Polyhedra : Instabilities and Remedies ». Inorganics 11, no 1 (9 janvier 2023) : 36. http://dx.doi.org/10.3390/inorganics11010036.

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The field of coordination chemistry has undergone rapid transformation from preparation of monometallic complexes to multimetallic complexes. So far numerous multimetallic coordination complexes have been synthesized. Multimetallic coordination complexes with well-defined architectures are often called as metal organic polygons and polyhedra (MOPs). In recent past, MOPs have received tremendous attention due to their potential applicability in various emerging fields. However, the field of coordination chemistry of MOPs often suffer set back due to the instability of coordination complexes particularly in aqueous environment-mostly by aqueous solvent and atmospheric moisture. Accordingly, the fate of the field does not rely only on the water solubilities of newly synthesized MOPs but very much dependent on their stabilities both in solution and solid state. The present review discusses several methodologies to prepare MOPs and investigates their stabilities under various circumstances. Considering the potential applicability of MOPs in sustainable way, several methodologies (remedies) to enhance the stabilities of MOPs are discussed here.
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Patrick, W. H., et M. Verloo. « Distribution of soluble heavy metals between ionic and complexed forms in a saturated sediment as affected by pH and redox conditions ». Water Science and Technology 37, no 6-7 (1 mars 1998) : 165–71. http://dx.doi.org/10.2166/wst.1998.0749.

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Research was undertaken to determine the effects of pH and redox potential on heavy metal speciation and on the size distribution of the organo-metal complexes in the soluble fraction of sediment-water systems. A cation exchange technique was effective in separating free and complexed metal ions. Fe, Mn and Zn differed in the extent of complexation with soluble organic matter. Under reducing conditions approximately two thirds of the soluble Fe was in a complexed form that was not sorbed in passing through the cation exchange resin. Soluble Mn on the other hand, was almost completely ionic under reducing conditions, with only a trace amount passing through the resin column. Over 90 percent of the soluble Zn was complexed under reduced conditions, with only 9 percent sorbed onto the resin. The complexed Fe and Zn were bound to soluble organic matter particles with equivalent molecular weight greater than 25,000 while Mn passed through this size filter. There were marked differences in the size distribution of the various organo-metal complexes under different redox and pH conditions. The soluble Fe was associated with both the largest and smallest size ranges of soluble organic matter. The effect of pH was most evident in the smallest size range with much more complexed iron being present at low pHs. Mn, on the other hand, was associated with only the smallest size range under all pH and redox conditions, reflecting its ionic nature. The greater solubility and mobility of Mn probably accounts for it being depleted relative to iron in Gulf Coast sediments. Hg and Pb were associated with only the largest size soluble complexes and were little affected by pH and redox conditions.
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Uhl, A. R., J. K. Katahara et H. W. Hillhouse. « Molecular-ink route to 13.0% efficient low-bandgap CuIn(S,Se)2 and 14.7% efficient Cu(In,Ga)(S,Se)2 solar cells ». Energy & ; Environmental Science 9, no 1 (2016) : 130–34. http://dx.doi.org/10.1039/c5ee02870a.

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Thompson, Mark. « The Evolution of Organometallic Complexes in Organic Light-Emitting Devices ». MRS Bulletin 32, no 9 (septembre 2007) : 694–701. http://dx.doi.org/10.1557/mrs2007.144.

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This article is an edited transcript of the MRS Medal presentation given by Mark Thompson (University of Southern California) on November 28, 2006, at the Materials Research Society Fall Meeting in Boston. Thompson was awarded the Medal for the “development of highly efficient heavy-metal phosphor complexes.” The MRS Medal recognizes a specific outstanding recent discovery or advancement which is expected to have a major impact on the progress of any materials-related field.Successful research efforts have led to improvements in the internal efficiencies of organic light-emitting devices (OLEDs) from 25% to 100%. The electroluminescence process in OLEDs involves the formation of both singlet and triplet excitons, formed in a ratio of 1:3. There is a drive to improve spin statistics by developing compounds in which triplet excitons, in addition to singlet excitons, can be used efficiently. Success with the incorporation of heavy-metal–based phosphors into OLEDs, in which the strong spin-orbit coupling of the metal atom allows for efficient molecular phosphorescence from triplet excitons, resulted in the identification and synthesis of an iridium complex, fac-tris-phenylpyridine iridium, with internal efficiencies of 100%. This, in turn, has led to the synthesis of more than 100 iridium- and platinum-based compounds, which have become the most efficient light-emitting compounds yet discovered. Intellectual property from Thompson's research in this field has led to more than 50 U.S. patents and substantial entrepreneurial investment toward commercial applications and devices.
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Nakamura, Eiichi, et Masaya Sawamura. « Chemistry of η5-fullerene metal complexes ». Pure and Applied Chemistry 73, no 2 (1 janvier 2001) : 355–59. http://dx.doi.org/10.1351/pac200173020355.

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Treatment of [60]fullerene with an organocopper reagent converts one of the pentagons of the fullerene into cyclopentadienyl anion through addition of five organic groups on every peripheral carbon atom surrounding the pentagon. Similar treatment of [70]fullerene afforded indenyl anion through regioselective tri-addition of the organic group. These anionic moieties strongly interact with the remainder of the fullerene p-system, and provide unique opportunity for exploration of organometallic chemistry of a new class of metal cyclopentadienides.
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Shaheen, Muhammad, Shanshan Feng, Mehwish Anthony, Muhammad Tahir, Mubashir Hassan, Sung-Yum Seo, Saeed Ahmad, Mudassir Iqbal, Muhammad Saleem et Changrui Lu. « Metal-Based Scaffolds of Schiff Bases Derived from Naproxen : Synthesis, Antibacterial Activities, and Molecular Docking Studies ». Molecules 24, no 7 (29 mars 2019) : 1237. http://dx.doi.org/10.3390/molecules24071237.

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We report here the synthesis, characterization, and antibacterial evaluation of transition metal complexes of Ni, Cu, Co, Mn, Zn, and Cd (6a–f), using a Schiff base ligand (5) derived from naproxen (an anti-inflammatory drug) and 5-bromosalicylaldehyde by a series of reactions. The ligand and the synthesized complexes were characterized by elemental analysis, UV-Visible, FTIR, and XRD techniques. The ligand 5 behaves as a bidentate donor and coordinates with metals in square planar or tetrahedral fashion. In order to evaluate its bioactivity profile, we screened the Schiff base ligand and its metal complexes (6a–f) against different species of bacteria and the complexes were found to exhibit significant antibacterial activity. The complexes showed more potency against Bacillus subtilis as compared to the other species. Moreover, we modeled these complexes’ binding affinity against COX1 protein using computational docking.
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Sellmann, Dieter, Gerhard Freyberger et Matthias Moll. « Übergangsmetallkomplexe mit Schwefelliganden, XLVIa. Zn-, Cd-, Hg-, Sn-, Pb-, Sb-, Bi- und Ti-Komplexe mit den zwei- und vierzähnigen Thiolatliganden 'buS2'2- = 3,5-Di(t-butyl)benzol-1,2-dithiolat(2—), 'S4'2- = 1,2-Bis(2-mercaptophenylthio)ethan(2—) und 'buS4'2- = 1,2-Bis(3,5-di(t-butyl)-2-mercaptophenylthio)ethan(2–) / Transition Metal Complexes with Sulfur Ligands, XLVIa. Zn, Cd, Hg, Sn, Pb, Bi and Ti Complexes with the Bi- and Tetradentate Thiolato Ligands 'buS2'2- = 3,5-Di(t-butyl)benzene-1,2-dithiolate(2–), 'S4'2 = 1,2-Bis(2-mercaptophenylthio)ethane(2–) and 'buS4'2- = 1,2-Bis(3,5-di(t-butyl)-2-mercaptophenylthio)ethane(2 – ) ». Zeitschrift für Naturforschung B 44, no 9 (1 septembre 1989) : 1015–22. http://dx.doi.org/10.1515/znb-1989-0905.

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Syntheses of neutral 'buS2'-, 'S4'- and 'buS4'- and of anionic .buS2-complexes with various main group and transition metals are described. The complexes were prepared by reacting the neutral sulfur ligands or their alkali salts with the metal halide or alkoxide. The ligands coordinate to metal ions in normal as well as high oxidation states. No redox reactions occur in the latter case. The complexes are usually soluble in organic solvents and were characterized by elemental analysis and spectroscopic means.
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Schreiber, A., H. Rauter, M. Krumm, S. Menzer, E. C. Hillgeris et B. Lippert. « Multinuclear Metal Nucleobase Complexes ». Metal-Based Drugs 1, no 2-3 (1 janvier 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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Bamigboye, Mercy O., Ikechukwu P. Ejidike, Racheal O. Awolope, Joshua A. Obaleye et Favour K. Ejimofor. « Preparation, Characterization, and Antimicrobial Activities of Mixed Ibuprofen-Salicylic Acid Metal-Drug Complexes ». Tanzania Journal of Science 47, no 5 (30 décembre 2021) : 1835–43. http://dx.doi.org/10.4314/tjs.v47i5.28.

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Most variants of bacteria are resistant to traditional antibiotics which are organic. To overcome the growing infections, bacteria resistant infections, and multiple drug resistance (MDR) rates, transition metals with biological importance were coordinated to organic ligands (Ibuprofen and Salicylic acid) with anti-inflammatory properties. In this study, metal complexes of mixed Ibuprofen and Salicylic acid were prepared using a standard method to give of the type [M(Ibu)(Sal)X] (where M = Fe2+, Ni2+, Cu2+, and X = Cl2, Ibu = Ibuprofen, Sal = Salicylic acid). The complexes were characterized by UV-visible spectroscopy, conductivity measurements, melting points, FT-IR, and X-ray diffraction. The metal ions are coordinated to the ligands via the carboxylato oxygen donor atoms of both ligands. From the physicochemical data, the complexes are non-electrolytes. The XRD study suggested that the metal complexes possess a well-defined crystalline structure with average crystallite sizes of < 62 nm. Evaluations of the antimicrobial activities of the ligands and their complexes against gram-positive bacteria (S. aureus, B. subtilis, S. faecalis) and gram-negative bacteria (K. pneumonia, E. coli, and P. aeroginosa) via standard method were utilized to determine the zones of inhibition. The complexes exhibited a higher zone of inhibition, indicating higher antimicrobial activities when compared to the parent ligand. The results revealed that the metal-drug complexes are promising chemotherapeutic agents with wide spectrum of activities. Keywords: Metal-drug complexes; Ibuprofen; Spectra studies; Salicylic acid; Antimicrobial activity
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YAMAZAKI, Hiroshi. « Studies on organotransition metal complexes. » Journal of Synthetic Organic Chemistry, Japan 45, no 3 (1987) : 244–57. http://dx.doi.org/10.5059/yukigoseikyokaishi.45.244.

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Galanin, N. E., L. A. Yakubov, E. V. Kudrik et G. P. Shaposhnikov. « Metal complexes of 1-methyltetrabenzooctadehydrocorrin ». Russian Journal of Organic Chemistry 45, no 2 (février 2009) : 206–10. http://dx.doi.org/10.1134/s1070428009020080.

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Salzer, A. « Nomenclature of Organometallic Compounds of the Transition Elements (IUPAC Recommendations 1999) ». Pure and Applied Chemistry 71, no 8 (30 août 1999) : 1557–85. http://dx.doi.org/10.1351/pac199971081557.

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Organometallic compounds are defined as containing at least one metal-carbon bond between an organic molecule, ion, or radical and a metal. Organometallic nomenclature therefore usually combines the nomenclature of organic chemisty and that of coordination chemistry. Provisional rules outlining nomenclature for such compounds are found both in Nomenclature of Organic Chemistry, 1979 and in Nomenclature of Inorganic Chemistry, 1990This document describes the nomenclature for organometallic compounds of the transition elements, that is compounds with metal-carbon single bonds, metal-carbon multiple bonds as well as complexes with unsaturated molecules (metal-p-complexes).Organometallic compounds are considered to be produced by addition reactions and so they are named on an addition principle. The name therefore is built around the central metal atom name. Organic ligand names are derived according to the rules of organic chemistry with appropriate endings to indicate the different bonding modes. To designate the points of attachment of ligands in more complicated structures, the h, k, and m-notations are used. The final section deals with the abbreviated nomenclature for metallocenes and their derivatives.ContentsIntroduction Systems of Nomenclature2.1 Binary type nomenclature 2.2 Substitutive nomenlcature 2.3 Coordination nomenclature Coordination Nomenclature3.1 General definitions of coordination chemistry 3.2 Oxidation numbers and net charges 3.3 Formulae and names for coordination compounds Nomenclature for Organometallic Compounds of Transition Metals 4.1 Valence-electron-numbers and the 18-valence-electron-rule 4.2 Ligand names 4.2.1 Ligands coordinating by one metal-carbon single bond 4.2.2 Ligands coordinating by several metal-carbon single bonds 4.2.3 Ligands coordinating by metal-carbon multiple bonds 4.2.4 Complexes with unsaturated molecules or groups 4.3 Metallocene nomenclature
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Cameselle, Claudio, Susana Gouveia et Adrian Cabo. « Enhanced Electrokinetic Remediation for the Removal of Heavy Metals from Contaminated Soils ». Applied Sciences 11, no 4 (18 février 2021) : 1799. http://dx.doi.org/10.3390/app11041799.

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The electrokinetic remediation of an agricultural soil contaminated with heavy metals was studied using organic acids as facilitating agents. The unenhanced electrokinetic treatment using deionized water as processing fluid did not show any significant mobilization and removal of heavy metals due to the low solubilization of metals and precipitation at high pH conditions close to the cathode. EDTA and citric acid 0.1 M were used as facilitating agents to favor the dissolution and transportation of metals. The organic acids were added to the catholyte and penetrated into the soil specimen by electromigration. EDTA formed negatively charged complexes. Citric acid formed neutral metal complexes in the soil pH conditions (pH = 2–4). Citric acid was much more effective in the dissolution and transportation out of the soil specimen of complexed metals. In order to enhance the removal of metals, the concentration of citric acid was increased up to 0.5 M, resulting in the removal of 78.7% of Cd, 78.6% of Co, 72.5% of Cu, 73.3% of Zn, 11.8% of Cr and 9.8% of Pb.
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Sun, Mingjing, Zhongqi He et Deb P. Jaisi. « Role of metal complexation on the solubility and enzymatic hydrolysis of phytate ». PLOS ONE 16, no 8 (13 août 2021) : e0255787. http://dx.doi.org/10.1371/journal.pone.0255787.

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Phytate is a dominant form of organic phosphorus (P) in the environment. Complexation and precipitation with polyvalent metal ions can stabilize phytate, thereby significantly hinder the hydrolysis by enzymes. Here, we studied the stability and hydrolyzability of environmentally relevant metal phytate complexes (Na, Ca, Mg, Cu, Zn, Al, Fe, Al/Fe, Mn, and Cd) under different pHs, presence of metal chelators, and thermal conditions. Our results show that the order of solubility of metal phytate complexes is as follows: i) for metal species: Na, Ca, Mg > Cu, Zn, Mn, Cd > Al, Fe, ii) under different pHs: pH 5.0 > pH 7.5), and iii) in the presence of chelators: EDTA> citric acid. Phytate-metal complexes are mostly resistant towards acid hydrolysis (except Al-phytate), and dry complexes are generally stable at high pressure and temperature under autoclave conditions (except Ca phytate). Inhibition of metal complex towards enzymatic hydrolysis by Aspergillus niger phytase was variable but found to be highest in Fe phytate complex. Strong chelating agents such as EDTA are insufficient for releasing metals from the complexes unless the reduction of metals (such as Fe) occurs first. The insights gained from this research are expected to contribute to the current understanding of the fate of phytate in the presence of various metals that are commonly present in agricultural soils.
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Tamang, Sem Raj, et Michael Findlater. « Emergence and Applications of Base Metals (Fe, Co, and Ni) in Hydroboration and Hydrosilylation ». Molecules 24, no 17 (3 septembre 2019) : 3194. http://dx.doi.org/10.3390/molecules24173194.

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Base metal catalysis offers an alternative to reactions, which were once dominated by precious metals in hydrofunctionalization reactions. This review article details the development of some base metals (Fe, Co, and Ni) in the hydroboration and hydrosilylation reactions concomitant with a brief overview of recent advances in the field. Applications of both commercially available metal salts and well-defined metal complexes in catalysis and opportunities to further advance the field is discussed as well.
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Xu, Hui, Runfeng Chen, Qiang Sun, Wenyong Lai, Qianqian Su, Wei Huang et Xiaogang Liu. « Recent progress in metal–organic complexes for optoelectronic applications ». Chem. Soc. Rev. 43, no 10 (2014) : 3259–302. http://dx.doi.org/10.1039/c3cs60449g.

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Chivers, Tristram, Mark Edwards, Pramesh N. Kapoor, Auke Meetsma, Johan C. Van de Grampel et Arie Van Der Lee. « Metal Complexes of Dithiatetrazocines ». Phosphorus, Sulfur, and Silicon and the Related Elements 65, no 1-4 (février 1992) : 135–38. http://dx.doi.org/10.1080/10426509208055337.

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Queirós, Carla, Ana M. G. Silva, Baltazar de Castro et Luís Cunha-Silva. « From Discrete Complexes to Metal–Organic Layered Materials : Remarkable Hydrogen Bonding Frameworks ». Molecules 25, no 6 (16 mars 2020) : 1353. http://dx.doi.org/10.3390/molecules25061353.

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A series of metal–organic coordination complexes based on alkaline-earth metal centers [Mg(II), Ca(II), and Ba(II)] and the ligand 5-aminoisophthalate (aip2−) revealed notable structural diversity, both in the materials’ dimensionality and in their hydrogen bonding networks: [Mg(H2O)6]∙[Mg2(Haip)(H2O)10]∙(Haip)∙3(aip)∙10(H2O) (1) and [Mg(aip)(phen)(H2O)2]∙(H2O) (2) were isolated as discrete complexes (0D); [Ca(aip)(H2O)2]∙(H2O) (3), [Ca(aip)(phen)(H2O)2]∙(phen)∙(H2O) (4), and [Ba2(aip)2(phen)2(H2O)7]∙2(phen)∙2(H2O) (5) revealed metal–organic chain (1D) structures, while the [Ba(aip)(H2O)] (6) showed a metal–organic layered (2D) arrangement. Furthermore, most of these metal–organic coordination materials revealed interesting thermal stability properties, being stable at temperatures up to 450 °C.
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Malinakova, Helena C. « Asymmetric organic synthesis with stoichiometric transition metal complexes ». Arkivoc 2021, no 3 (5 mars 2021) : 157–84. http://dx.doi.org/10.24820/ark.5550190.p011.454.

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Ito, Yoshihiko. « Application of Isonitrile-Metal Complexes to Organic Synthesis ». Journal of Synthetic Organic Chemistry, Japan 68, no 12 (2010) : 1239–48. http://dx.doi.org/10.5059/yukigoseikyokaishi.68.1239.

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WATANABE, Yoshihisa, et Teruyuki KONDO. « Novel organic syntheses using group VIII metal complexes. » Journal of Synthetic Organic Chemistry, Japan 47, no 12 (1989) : 1132–45. http://dx.doi.org/10.5059/yukigoseikyokaishi.47.1132.

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UEMATSU, Takayoshi, et Shogo SHIMAZU. « Selective Organic Synthesis by Clay Supported Metal Complexes. » Journal of The Japan Petroleum Institute 37, no 1 (1994) : 1–9. http://dx.doi.org/10.1627/jpi1958.37.1.

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YOSHIKAWA, Sadao. « Transformation of Nutritive Organic Substrates Using Metal Complexes ». Journal of Japan Oil Chemists' Society 39, no 10 (1990) : 753–57. http://dx.doi.org/10.5650/jos1956.39.10_753.

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Fisher, Matthew G., Philip A. Gale, Mark E. Light et Stephen J. Loeb. « Metal–organic anion receptors : trans-functionalised platinum complexes ». Chemical Communications, no 44 (2008) : 5695. http://dx.doi.org/10.1039/b816002c.

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Knölker, Hans-Joachim, et Michael Bauermeister. « Transition metal-diene complexes in organic synthesis - 16.1 ». Tetrahedron 49, no 48 (janvier 1993) : 11221–36. http://dx.doi.org/10.1016/s0040-4020(01)81809-3.

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Bezombes, Jean-Philippe, Claude Chuit, Robert R. J. Corriu et Catherine Reyé. « Organic–inorganic hybrid materials containing metal phosphine complexes ». Journal of Organometallic Chemistry 643-644 (février 2002) : 453–60. http://dx.doi.org/10.1016/s0022-328x(01)01489-9.

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Bilbeisi, Rana A., John-Carl Olsen, Loïc J. Charbonnière et Ali Trabolsi. « Self-assembled discrete metal–organic complexes : Recent advances ». Inorganica Chimica Acta 417 (juin 2014) : 79–108. http://dx.doi.org/10.1016/j.ica.2013.12.015.

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Musselle-Sexton, Jake, Michael Probert et Jonathan Sellars. « Probing spin crossover in novel metal–organic complexes ». Acta Crystallographica Section A Foundations and Advances 75, a2 (18 août 2019) : e475-e475. http://dx.doi.org/10.1107/s2053273319090818.

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Abadía, M., R. González-Moreno, A. Sarasola, G. Otero-Irurueta, A. Verdini, L. Floreano, A. Garcia-Lekue et C. Rogero. « Massive Surface Reshaping Mediated by Metal–Organic Complexes ». Journal of Physical Chemistry C 118, no 51 (12 décembre 2014) : 29704–12. http://dx.doi.org/10.1021/jp505802h.

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Gao, Qin, Chao Zou et Wei Lu. « Lyotropic Chromonic Mesophases Derived from Metal-Organic Complexes ». Chemistry - An Asian Journal 13, no 21 (25 septembre 2018) : 3092–105. http://dx.doi.org/10.1002/asia.201800737.

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