Bibliografias temáticas / Metal carbonyl compounds

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Literatura científica selecionada sobre o tema "Metal carbonyl compounds"

Autor: Grafiati

Publicado: 25 de julho de 2024

Última modificação: 31 de julho de 2024

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Artigos de revistas sobre o assunto "Metal carbonyl compounds"

Bond, Alan M., e Ray Colton. "Electrochemical studies of metal carbonyl compounds". Coordination Chemistry Reviews 166 (novembro de 1997): 161–80. http://dx.doi.org/10.1016/s0010-8545(97)00022-2.

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Araki, Shuki, Hirokazu Ito e Yasuo Batsugan. "Cadmium metal-mediated allylation of carbonyl compounds". Journal of Organometallic Chemistry 347, n.º 1-2 (junho de 1988): 5–9. http://dx.doi.org/10.1016/0022-328x(88)80263-8.

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Lee, Ha-Eun, Dopil Kim, Ahrom You, Myung Hwan Park, Min Kim e Cheoljae Kim. "Transition Metal-Catalyzed α-Position Carbon–Carbon Bond Formations of Carbonyl Derivatives". Catalysts 10, n.º 8 (2 de agosto de 2020): 861. http://dx.doi.org/10.3390/catal10080861.

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α-Functionalization of carbonyl compounds in organic synthesis has traditionally been accomplished via classical enolate chemistry. As α-functionalized carbonyl moieties are ubiquitous in biologically and pharmaceutically valuable molecules, catalytic α-alkylations have been extensively studied, yielding a plethora of practical and efficient methodologies. Moreover, stereoselective carbon–carbon bond formation at the α-position of achiral carbonyl compounds has been achieved by using various transition metal–chiral ligand complexes. This review describes recent advances—in the last 20 years and especially focusing on the last 10 years—in transition metal-catalyzed α-alkylations of carbonyl compounds, such as aldehydes, ketones, imines, esters, and amides and in efficient carbon–carbon bond formations. Active catalytic species and ligand design are discussed, and mechanistic insights are presented. In addition, recently developed photo-redox catalytic systems for α-alkylations are described as a versatile synthetic tool for the synthesis of chiral carbonyl-bearing molecules.

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Gibson, Dorothy H., e Yekhlef S. El-Omrani. "Selective reductions of carbonyl compounds with group 6 metal carbonyl hydrides". Organometallics 4, n.º 8 (agosto de 1985): 1473–75. http://dx.doi.org/10.1021/om00127a035.

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Jaitner, Peter, e Wolfgang Winder. "Reaction of α-Me2TeJ2 with metal carbonyl compounds". Inorganica Chimica Acta 134, n.º 2 (novembro de 1987): 201–2. http://dx.doi.org/10.1016/s0020-1693(00)88080-9.

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Aucott, Benjamin J., Anne-Kathrin Duhme-Klair, Benjamin E. Moulton, Ian P. Clark, Igor V. Sazanovich, Michael Towrie, L. Anders Hammarback, Ian J. S. Fairlamb e Jason M. Lynam. "Manganese Carbonyl Compounds Reveal Ultrafast Metal–Solvent Interactions". Organometallics 38, n.º 11 (23 de maio de 2019): 2391–401. http://dx.doi.org/10.1021/acs.organomet.9b00212.

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ALPER, H. "ChemInform Abstract: Metal-Catalyzed Routes to Carbonyl Compounds". ChemInform 26, n.º 26 (17 de agosto de 2010): no. http://dx.doi.org/10.1002/chin.199526303.

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BOND, A. M., e R. COLTON. "ChemInform Abstract: Electrochemical Studies of Metal Carbonyl Compounds". ChemInform 29, n.º 17 (23 de junho de 2010): no. http://dx.doi.org/10.1002/chin.199817281.

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Nishino, Toshiki, Yutaka Nishiyama e Noboru Sonoda. "Reductive coupling of carbonyl compounds using lanthanum metal". Heteroatom Chemistry 11, n.º 1 (2000): 81–85. http://dx.doi.org/10.1002/(sici)1098-1071(2000)11:1<81::aid-hc12>3.0.co;2-1.

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Chen, Hong, Zi-Chao Tang, Rong-Bin Huang e Lan-Sun Zheng. "Photodissociation Mass Spectrometry of Trinuclear Carbonyl Clusters M3(CO)12 (M = Fe, Ru, Os)". European Journal of Mass Spectrometry 6, n.º 1 (fevereiro de 2000): 19–22. http://dx.doi.org/10.1255/ejms.301.

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Photodissociation of trinuclear carbonyl cluster compounds of Fe, Ru and Os was studied by recording the mass spectra produced from laser ablation of the cluster compounds. Under the experimental conditions, dissociation of the cluster compounds is very extensive, but the dissociation pathway of the osmium cluster is different from those of the iron and ruthenium clusters. The iron and ruthenium clusters not only lost their carbonyl ligands, but their cluster cores were also fragmented. As the osmium cluster dissociated, it ejected three pairs of oxygen atoms, in sequence, before losing the carbonyl ligands, but the trinuclear osmium core did not fragment. This specific dissociation scheme of the osmium cluster reveals its special structural stability. Not only does it have stronger metal-metal bonds, but also a relatively stable coordination bond formed between osmium and carbonyl ligands. In addition, different distributions of positive and negative fragment ions were observed in the experiment. This difference is interpreted as the result of different stabilities of their electronic structures.

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Teses / dissertações sobre o assunto "Metal carbonyl compounds"

Taylor, Paul H. "Metal free-oxygenation of carbonyl compounds". Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54244/.

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The findings to date have contributed to the development of a novel and useful class of synthetic protocol and have resulted in a greatly enhanced understanding of the fundamental workings of the &agr;-oxygenation.

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Bojczuk, M. "Carbonyl exhange mechanisms in transition metal compounds". Thesis, University of Kent, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372765.

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Lorusso, Patrizia. "Metal catalysed alkylation of carbonyl compounds with formaldehyde". Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7823.

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Formaldehyde is a chemical used widely in the manufacture of building materials. A remarkable example is represented by the Lucite two-step Alpha technology for the large scale production of methyl methacrylate (MMA), the essential building block of all acrylic-based products. Esters and ketones are important intermediates in the manufacture of acrylate esters therefore α-hydroxymethylenation of carbonyl compounds using formaldehyde as a one carbon alkylating agent and subsequent dehydration to the corresponding methylenated derivatives has been explored in the current work. We report a novel catalytic approach for the synthesis of methyl methacrylate (MMA) via one-pot α-methylenation of methyl propanoate (a chemical intermediate of the ALPHA process) with formaldehyde, generated in situ by Ru-catalysed dehydrogenation of methanol. Elucidation of the mechanism involved in the catalytic dehydrogenation of methanol along with the collateral alcohol decarbonylation reaction was gained through a combined experimental and DFT study. The development of an alternative process where anhydrous formaldehyde is produced in situ would provide a simplification over the current second step of the ALPHA technology where the formaldehyde is initially produced as formalin, subsequently dehydrated to afford anhydrous formaldehyde in order to ensure high selectivity to MMA. As an alternative approach, ketones, in particular 3-pentanone and 2-butanone, were targeted as potential substrates in order to overcome some of the problems related to competing reactions that occur at the ester group. Hydroxymethylenation, followed by dehydration and Baeyer-Villager oxidation, possibly catalysed by enzymes to reverse the normal selectivity, leads to the formation of acrylate esters. The catalytic reaction is enabled by a gold carbene hydroxide complex in such a way that the substrate undergoes C-H activation and the nascent metal alkyl acts as a nucleophile towards the electrophilic formaldehyde, supplied in the form of alcoform* (solution of paraformaldehyde in methanol).

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Llewellyn, Simon. "Acyl carbonyl transition metal compounds : their homologation and hydrogenation". Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433556.

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洪若華 e Yeuk-wah Hung. "The chemistry of Osmium-Rhodium mixed-metal carbonyl clusters". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B3121535X.

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Hung, Yeuk-wah. "The chemistry of Osmium-Rhodium mixed-metal carbonyl clusters /". Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19904988.

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Ladogana, Santino. "Kinetics and Mechanisms of Metal Carbonyls". Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc278709/.

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Pulsed laser flash photolysis with both visible and infrared detection has been applied to the study of the displacement of weakly coordinating ligands (Lw) by strongly "trapping" nucleophiles (Ls) containing either an olefinic functionality (Ls = 1-hexene, 1-decene, 1-tetradecene) or nitrogen (Ls = acetonitrile, hydrocinnamonitrile) from the photogenerated 16 electron pentacarbonylchromium (0) intermediate. 5-Chloropent-l-ene (Cl-ol), a potentially bidentate ligand, has been shown to form (ol-Cl) pentacarbonylchromium (0), in which Cl-ol is bonded to Cr via a lone pair on the chlorine, and isomerize to (Cl-ol) pentacarbonylchromium (0), in which Cl-ol is bonded to the olefinic functionality on the submillisecond time scale. This process has been studied in both the infrared and visible region employing both fluorobenzene or n-heptane as the "inert" diluent. Parallel studies employing 1-chlorobutane and 1-hexene were also evaluated and showed great similiarity with the Cl-ol system. The data supported a largely dissociative process with a possibility of a small interchange process involving the H's on the alkyl chain. Studies were also carried out for various Cr(CO)6/arene/Ls systems (arene = various alkyl or halogenated substituted benzenes). The data indicated that for both C6H5R (R=various alkyl chains) or multi-alkyl substituted arenes (i.e. o-xylene, 1,2,3-trimethylbenzene) containing an "unhindered" ring-edge, bonding to the the Cr(CO)5 moiety occurs "edge on" via a partially delocalized center of unsaturation on the ring. The data indicated that both electronic and steric properties of the arenes influence the kinetics, and that an interchange pathway takes place at least, in part, through the alkyl chains on both the arenes and "trapping" nucleophiles. Moreover, halogenated arenes bond through the lone pair on the halogen for both CI- and Br- derivatives but "edge-on" for the fluorinated arenes. Finally, in the case of arene complexes without and "unhindered" ring-edge (i.e., 1,2,3,4,5-pentamethylbenzene) bonding can occur either "edge-on" or through the ring center of the arene or combination of the two. Carbonyl stretching frequencies for the arenes are also indicative of the type of bonding.

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Mansour, Saber E. (Saber El-Sayed). "The Nature of Intermediates Produced Through Ligand-Substitution Reactions of Octahedral Metal Carbonyls". Thesis, North Texas State University, 1986. https://digital.library.unt.edu/ark:/67531/metadc331634/.

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Pulsed laser time-resolved ligand-substitution photochemistry for (DTO)W(CO)4, (DTN)W(CO)4, and (NP)Mo(CO)4 (DTO = 2,2,7,7-tetramethyl-3,6-diathiaoctane; DTN = 2,2,8,8- tetramethyl-3,7-diathianonane; NP = l-diethylamino-2- diphenylphosphinoethane) proceeds via initial fission of the W-S and Mo-P bonds, affording Cs and C4v five-coordinate intermediates for DTN and NP but largely Cs for DTO. The rates of reaction of these intermediates, via chelate ring closure and competitive bimolecular interaction with Lewis bases (= L, alkylphosphines and alkyl phosphites) for the Cs intermediates and via bimolecular interaction of L with the C4v intermediates, together with activation parameters for these processes have been determined. The rates of interactions at the Cs intermediates are significantly faster than at the C4v intermediates.

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王淑儀 e Shuk-yee Janet Wong. "The chemistry of osmium carbonyl clusters containing oxime and oxo ligands". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31244932.

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Ismail, Ashraf A. "Chalcocarbonyl chemistry : application in hormonal receptor determination, metalloporphyrins and metal-arene bond activation". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72063.

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The reaction of ((eta)-Arene)Cr(CO)(,2)(CX) (X = S, Se) complexes with excess (RO)(,3)P (R = Me, Et, n-Bu, Ph) yields Cr(CO)(,2)(CX) (RO)(,3)P (,3), predominantly as the mer I isomer, in which a phosphite ligand is trans to CX. Arene displacement from ((eta)-C(,6)H(,6))Cr(CO)(,2)(CX) by tridentate phosphine ligands L-L-L L-L-L = (Me)C(CH(,2)P(Ph)(,2))(,3), (Ph(,2)PCH(,2)CH(,2))(,2)PhP gives fac-(L-L-L)Cr(CO)(,2)(CX) products. The molecular structures of Cr(CO)(,2)(CX) (MeO)(,3)P (,3) have been determined by single crystal X-ray diffraction. Intramolecular isomerization of these complexes as well as their tricarbonyl analogue has been demonstrated and activation parameters have been calculated for the rearrangement processes. Two-dimensional ('31)P NMR spectroscopy has provided evidence that isomerization occurs via trigonal prismatic intermediates. Kinetic investigations of the reaction of ((eta)-C(,6)H(,6))Cr(CO)(,2)(CX) with (MeO)(,3)P have established a first-order rate dependence on both the complex and the entering ligand. The faster reaction rate of the selenocarbonyl derivative relative to its thiocarbonyl analogue originates in a lower entropy of activation in the former case. The effect on the reaction rate of variation in the nature of the arene and of the entering ligand has been investigated.
An approach to hormonal receptor assay involving the detection by FT-IR spectroscopy of Cr(CO)(,3)-labelled modified estradiol bound to estrogen receptors in target tissue is reported.
The FT-IR spectra of FeTPP(CX) FeTPP = (5,10,15,20-tetraphenyl-porphinato)Fe(II); X = S, Se and FeTPP(CX)L (X = S, Se; L = pyridine, ethanol) have been obtained. Some changes in the porphyrin spectrum were observed with variation or removal of L, but not with variation of X.

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Livros sobre o assunto "Metal carbonyl compounds"

Kelly, Tracy A. Studies of mono- and diphosphine metal carbonyl complexes. Dublin: University College Dublin, 1997.

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Scott, McIndoe J., ed. Transition metal carbonyl cluster chemistry. Amsterdam, The Netherlands: Gordon and Breach Science Publishers, 2000.

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Sellow, Khaled Ahmed F. Studies of the reactions of metal carbonyl complexes with phosphorus and nitrogen-containing ligands. Dublin: University College Dublin, 1998.

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Malmvik, Ann-Charlotte. Structure and reactions of some complex metal hydride reagents used in reduction of carbonyl compounds: Asymmetric reductions, multinuclear NMR studies, computer modelling. Uppsala: Uppsala University?, 1985.

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Visnapuu, A. Recovery of critical metals by carbonyl processing. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1987.

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1942-, Hartley F. R., ed. The chemistry of the metal-carbon bond. Chichester: Wiley, 1987.

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Tatiana, Makarova, e Palacio Parada Fernando, eds. Carbon-based magnetism: An overview of the magnetism of metal free carbon-based compounds and materials. Amsterdam: Elsevier, 2006.

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Behr, Arno. Carbon dioxide activation by metal complexes. Weinheim: VCH, 1988.

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1942-, Hartley F. R., e Patai Saul, eds. The Chemistry of the metal-carbon bond. Chichester: Wiley, 1985.

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David, Morales-Morales, e Jensen Craig M. 1955-, eds. The chemistry of pincer compounds. Amsterdam: Elsevier, 2007.

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Capítulos de livros sobre o assunto "Metal carbonyl compounds"

Liu, Xin, John E. Ellis, Eugen F. Mesaros, Anthony J. Pearson, Elke Schoffers, Janice M. Hall, Joshua H. Hoyne et al. "Transition Metal Carbonyl Compounds". In Inorganic Syntheses, 96–132. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2004. http://dx.doi.org/10.1002/0471653683.ch3.

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Ceriotti, Alessandro, Roberto Della Pergola e Luigi Garlaschelli. "High-Nuclearity Carbonyl Metal Clusters". In Physics and Chemistry of Metal Cluster Compounds, 41–106. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-015-1294-7_2.

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Adams, Richard D., e István T. Horváth. "Novel Reactions of Metal Carbonyl Cluster Compounds". In Progress in Inorganic Chemistry, 127–81. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470166345.ch3.

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Darcel, Christophe, Jean-Baptiste Sortais, Duo Wei e Antoine Bruneau-Voisine. "Iron-, Cobalt-, and Manganese-Catalyzed Hydrosilylation of Carbonyl Compounds and Carbon Dioxide". In Non-Noble Metal Catalysis, 241–64. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527699087.ch10.

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Mews, Rüdiger. "Transition Metal Carbonyl Sulfur Dioxide and Thiazylfluoride Complexes: Reactions at the Metal Center and at the Ligand". In Efficient Preparations of Fluorine Compounds, 82–87. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118409466.ch15.

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Calderoni, F., M. C. Iapalucci e G. Longoni. "Compounds of Post-Transition Elements of Groups 12–14 Containing Fe(CO)4 and Related Iron Carbonyl Ligands". In Metal-Ligand Interactions, 85–103. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0155-1_4.

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Hu, Yang, e X. Peter Zhang. "Selective Olefination of Carbonyl Compounds via Metal-Catalyzed Carbene Transfer from Diazo Reagents". In Topics in Current Chemistry, 147–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/128_2012_319.

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Mcauliffe, C. A., e D. G. Kelly. "By Reaction with Transition- or Inner-Transition-Metal Carbonyl, Organometallic and Cluster Compounds". In Inorganic Reactions and Methods, 167–68. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145227.ch116.

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Newlands, M. J. "By Reaction of Vinyitin Compounds with Transition- or Inner Transition-Metal-Carbonyl Complexes". In Inorganic Reactions and Methods, 288. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145265.ch82.

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Newlands, M. J. "By Reaction of Aryltin Compound and Cyclopentadienyltin Compounds with Transition- or Inner Transition-Metal-Carbonyl and Other Complexes". In Inorganic Reactions and Methods, 289–90. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145265.ch84.

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Trabalhos de conferências sobre o assunto "Metal carbonyl compounds"

Angel, S. A., P. A. Hansen, E. J. Heilweil e J. C. Stephenson. "Application of Ultrafast Broadband Infrared Spectroscopy to Measurement of Metal-carbonyl Dynamics". In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/up.1990.mc13.

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There is growing interest in identifying transient structures, mode-specific energy content and reaction products generated in condensed-phase molecular systems on the picosecond or shorter timescale. This information is important for understanding the details of chemical reaction mechanisms and kinetics at ambient or elevated temperatures, especially for polyatomic molecules in solution. Recent developments in the field of ultrafast time-resolved infrared (IR) spectroscopy show promise of being able to observe these dynamical processes. In this poster, transient IR spectral measurements for CO-stretching vibrations of metal-carbonyl molecules and cluster compounds in solution which identify vibrational relaxation rates, intra-mode and intermolecular energy transfer and photo-dissociation products will be presented.

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Nakajima, Yoshiki, Hiromasa Murata, Takashi Suemasu e Kaoru Toko. "Expansion of Solid-phase Interactions between Carbon and Metals: Layer Exchange for Multilayer Graphene on Insulator". In 2019 Compound Semiconductor Week (CSW). IEEE, 2019. http://dx.doi.org/10.1109/iciprm.2019.8819339.

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Wormhoudt, J. "Tunable diode laser IR absorption diagnostics of semiconductor deposition". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fw4.

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This is a program to develop and demonstrate laser diagnostics of compound semiconductor processing systems, such as the metal-organic chemical-vapor deposition (MOCVD) of III–V and II–VI materials. It focuses on tunable infrared diode-laser absorption, a technique capable of high-sensitivity quantitative measurements of absolute concentrations of both radicals and stable molecules. A long-path plasma reactor is used to generate easily detectable amounts of a wide variety of radical species in plasmas that include organoarsine compounds or methane. These latter systems have their own intrinsic interest because of their applications in diamond and hard-carbon deposition, as well as gallium arsenide etching. In addition, they contain the hydrocarbon species that are also important in MOCVD. Results to date in methane plasma observations include measurements of the methane dissociation fraction and rotational temperature and the measurement of the absolute concentrations of the decomposition products CH3, C2H4, and C2H2. The dissociation fraction is large, reaching about 0.9 at applied powers above 500 W. C2H2 and C2H4 concentrations are large, but CH3 concentrations are much smaller, on the order of 104 of the total. Plasma temperatures are low, under400 K for all conditions observed to date. Also planned are observations of arsenic hydride species, which may play a key role in suppressing carbon incorporation in MOCVD.

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KWAK, A. "Application of Zinc-Silver Impregnated Activated Carbons in Removal of Lead(II) and Mercury(II) Compounds from Groundwater". In Quality Production Improvement and System Safety. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902691-9.

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Abstract. Nowadays activated carbon is a material generating great interest, as it is characterized by a vast surface area due to a high number of pores in its structure. Therefore, the main purpose behind its use is the filtration of impurities from air and water that can be adsorbed with high efficiency. Activated carbon can be easily modified as well. The paper describes activated carbon modification with copper-, manganese-, silver- and zinc salts. The effects of the selected impregnates and their concentrations were examined. The products included 5 adsorbent samples: four universal adsorbents, impregnated with all the above-mentioned salts, and one specific adsorbent sample, designed to adsorb lead(II) and mercury(II) ions and impregnated with zinc- and silver salts only. The premise was to obtain pure drinking water. Properties, such as bulk density, methylene blue number or iodine number were determined for the modified activated carbons. To test the efficiency of an improved adsorbent, an experiment with water highly contaminated with Pb(II) and Hg(II) was carried out, and its results revealed that absorption efficiency for these heavy metals exceeded 99.9%. The adsorber samples were also observed under a digital microscope to compare their appearance.

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Levy, Alan V., B. Q. Wang e G. Q. Geng. "Relationship Between Feedstock Characteristics and Erosivity of FBC Bed Materials". In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-249.

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The erosion-corrosion (E-C) metal wastage mechanisms and rates that occur in 1018 plain carbon steel used in tubular heat exchangers of fluid bed combustors (FBC) are discussed. The characteristics of FBC bed material erodent particles such as composition, shape, size and strength were found to have a major effect on the surface degradation mechanisms and rates which occurred. A total of sixteen different bed material particles from ten different FBCs were tested. It was determined that when the particles were strong enough to not shatter when they impacted the steel’s surface, their shape and composition were the most important factors in determining their erosivity. The relative amounts of SiO2, CaO, CaCO3, CaSO4, and alkali compounds in the bed materials were related to the metal wastage by using laboratory mixtures of the compounds as erodents. The ratio of SiO2 to CaO and CaCO3 was especially important in determining the erosivity of the bed materials. It was found that increasing this ratio increased the metal wastage. A sharp transition ratio occurred on either side of which the metal wastages were linear. The slope of the linear curve was low for the lower sand content mixtures and higher for higher sand content mixtures. The transition ratio required a higher CaO content for higher velocity particles.

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Pathak, Pawan, Sanghoon Park e Hyoung J. Cho. "Metal Oxide Semiconductor-Carbon Nanomaterial Network as a Flexible Chemical Sensor for Volatile Organic Compound Detection". In 2019 IEEE Sensors Applications Symposium (SAS). IEEE, 2019. http://dx.doi.org/10.1109/sas.2019.8705969.

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Dune, Kingdom Kponanyie, Adaobi Stephenie Nwosi-Anele e Bright Bariakpoa Kinate. "The Potentials of Activated Carbons from Elaeis Guineensis Biomasses for Produced Water Treatment: Harnessing Renewable Resources for Future Oil and Gas Production Enhancement in Africa". In SPE Nigeria Annual International Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/211975-ms.

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Abstract Wastes are produced during petroleum production as well as agricultural operations. The treatment of oilfield produced water (PW) for reuse using activated carbons (ACs) derived from Elaeis Guineensis biomasses was investigated. The biomasses (palm kernel shells, PKS and empty palm bunch, EPB) were prepared and converted to biochars by pyrolysis, and then activated with 0.2M HCl at a temperature of 450°C. The ACs were characterised for pH, bulk density, iodine numbers, ash and moisture contents, particle size, specific surface area, pore volume and size. The characteristics of the adsorbents indicate that iodine numbers ranged from 700.14-1181.48mg/g for EPB; 525.10-918.93mg/g for PKS; ash content ranged from 6.20-6.80% for EPB and 2.00-2.80% PKS. The AC particle sizes were optimized, and 300µm-size for both adsorbents showed good prospects based on iodine number. For this particle size, the mean pore volume and size, and specific surface area acquired using the Quantachrome NovaWin Instruments, version 11.03, were determined as 0.1689 cc/g, 3.102nm, and 1065 m2/g, for EPB, and 0.1353cc/g, 1.956nm and 300 m2/g, for PKS. The SEM results confirmed the surface morphology of the adsorbents, while XRF results showed that the adsorbents have high percentages of compounds of silicon, potassium, carbon, and calcium, but the PKS has no magnesium and barium. The EPB has no barium but 9.6% moles magnesium. Both have very low percentages of the heavy metals, namely, iron, chromium, aluminium, cobalt, zinc, nickel and copper. This implies that the ACs can effectively treat produced water to remove these heavy metal ions.

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Grbović Novaković, Jasmina, Sanja Milošević Govedarović, Igor Milanović, Tijana Pantić, Jelena Rmuš Mravik, Andjela Mitrović Rajić, Katarina Tošić et al. "The hydrogen economy: challenges and prospectives". In 2nd International Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.039gn.

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The fossil fuels-based economy led to considerable growth in CO2 footprint and air pollution. The shift toward renewable and green energy sources is necessary and a hydrogen-based economy may be a solution for both climate change and the need for a secure energy supply. To make the transition from the present carbon-based economy to the hydrogen economy several problems have to be solved, regarding the production, safety issues, and the storage of hydrogen. Hydrogen has high gravimetric chemical energy (142 MJ/kg) and its electrochemical reaction with oxygen in the fuel cell leads to zero carbon emission. It is abundant, but in the bonded form in water, hydrocarbons, and other organic compounds. The most of hydrogen is produced by the steam reforming of hydrocarbons. However, this is so-called “grey hydrogen”, as a considerable amount of CO2 and CO is released during the process. To meet the sustainability criteria, it is necessary to make the methods of “green hydrogen” generation, like water electrolysis, more affordable and energy efficient. Thus, the development of low-cost, stable electrocatalysts with high activity for the hydrogen evolution reaction (HER) without noble metals, is a considerable challenge. Among all possible solutions for hydrogen storage (gas cylinders, liquid tank, solid-state storage), the one which relies upon storage in solid media such as hydrides, is the most attractive. Solid-state storage implies hydrides such as metal/intermetallic and complex- chemical hydrides. Since the release of hydrogen from hydrides takes place via an endothermic process, this method of storage is the safest of all mentioned, but the problem of the slow sorption process and high temperature of desorption has to be solved if hydrogen is to be used as an energy carrier. In the last three decades, many studies have been performed, both experimental and theoretical, on the same subject – how to overcome these drawbacks. Sluggish thermodynamics and slow sorption/desorption kinetics can be altered by MgH2 destabilization through surface modification and structural deformation. To improve the diffusivity of hydrogen in the metal hydride, various techniques such as ball milling and ion bombardment are applied, which in turn reduces the particle size, increases the defect concentration and shortens the diffusion path for hydrogen. Also, sufficiently fast hydrogen sorption kinetics has been achieved by using metals, metal oxides, transition metals, and transition metal oxides as additives in the process of milling. In this short review, we have summarized the possibilities for the storage and production of hydrogen by green synthesis methods.

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Abdalla, Mayar Tarek. "Iron Magnesium Coating Chicken Bones for Removal of Copper from Water". In GOTECH. SPE, 2024. http://dx.doi.org/10.2118/219361-ms.

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Abstract Because heavy metals have detrimental effects on aquatic life and public health, their presence in freshwater sources is extremely concerning. Even in low quantities, copper (Cu), one of the most hazardous heavy metals, can result in major health problems. The current study seeks to create a novel adsorption medium using iron (Fe)-coated chicken bones Using magnesium hydroxides, copper can be eliminated from water. In which the chicken bones were treated with stacked double hydroxides (LDH) Physical adsorption is the process by which heavy metals from the waste liquid are adsorbed onto the chicken bone-based adsorbent. The cause of physical adsorption is an imbalance in the porous nature of the adsorbent surface, which draws the adsorbate (heavy metal) to the surface. The residue of inorganic materials left over after burning at temperatures higher than 575°C is known as ash. A substance is heated as part of the ash-making process, and the method involves drying, burning charcoal, and desolating volatile chemicals. Heat will be produced by burning the charcoal, volatile chemicals will evaporate, and moisture will be lost throughout the drying process. There will be an interaction between carbon and oxygen during the burning of charcoal to form co-gas, which then develops into CO2 gas so that in the end there will be only material known as ash. With a rough and porous surface shape, apatite carbonate compound minerals are a distinguishing feature of the adsorbent made from chicken bone ash. The adsorption performance can be improved by raising the ashing temperature, contact time, particle size, and weight of the adsorbent. The physical adsorption process is accelerated at near-neutral pH values. Adsorbents made of chicken bone ash can lower Cu metal levels while also improving waste quality. In this paper, Carbon-based adsorption is described as a traditional treatment with a high unit cost, particularly in underdeveloped nations.

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Atanasković, Ana, Thomas Eichhorn, Dejan Milenković, Dušan Dimić, Goran Kaluđerović e Jasmina Dimitrić Marković. "Synthesis, spectroscopic, and theoretical analysis of Ru(II)-phenylhydrazine complex". In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.395a.

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In recent decades, metal-based chemotherapeutics have attracted considerable attention and excitement within the oncology research community, with ruthenium(II) complexes emerging as a particularly promising class of anticancer agents. In this study, the synthesis of a new ruthenium complex was performed, followed by its structural characterization using NMR and IC spectroscopy. The compound’s infrared spectrum reveals characteristic bands corresponding to N-H and C-H stretching vibrations from sp2 and sp3 hybridized carbon atoms, vibrations of aromatic rings and additional vibrations related to CH3, C-N, and chloride species at various wavenumbers. The 1H NMR spectrum of the Ru140 complex reveals distinct peaks corresponding to different atomic environments, including protons attached to sp3 hybridized C-atoms, nitrogen atoms, and protons involved in aromatic rings, as well as signals from deuterated chloroform and water. The 13C NMR spectrum displays peaks for saturated carbon atoms in methyl and isopropyl groups at lower, and aromatic carbons at higher chemical shifts. The structure of the complex was optimized at B3LYP/6-31+G(d,p)(H,C,N,Cl)/LanL2DZ level of theory and intramolecular interactions were analyzed through the Natural Bond Orbital approach.

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Relatórios de organizações sobre o assunto "Metal carbonyl compounds"

Kanner, Joseph, Mark Richards, Ron Kohen e Reed Jess. Improvement of quality and nutritional value of muscle foods. United States Department of Agriculture, dezembro de 2008. http://dx.doi.org/10.32747/2008.7591735.bard.

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Food is an essential to our existence but under certain conditions it could become the origin to the accumulative health damages. Technological processes as heating, chopping, mincing, grounding, promote the lipid oxidation process in muscle tissues and meat foodstuffs. Lipid oxidation occurred rapidly in turkey muscle, intermediate in duck, and slowest in chicken during frozen storage. Depletion of tocopherol during frozen storage was more rapid in turkey and duck compared to chicken. These processes developed from lipid peroxides produce many cytotoxic compounds including malondialdehyde (MDA). The muscle tissue is further oxidized in stomach conditions producing additional cytotoxic compounds. Oxidized lipids that are formed during digestion of a meal possess the potential to promote reactions that incur vascular diseases. A grape seed extract (1% of the meat weight) and butylated hydroxytoluene (0.2% of the lipid weight) were each effective at preventing formation of lipid oxidation products for 3 hours during co-incubation with cooked turkey meat in simulated gastric fluid (SGF). Polyphenols in the human diet, as an integral part of the meal prevent the generation and absorption of cytotoxic compounds and the destruction of essential nutrients, eg. antioxidants vitamins during the meal. Polyphenols act as antioxidants in the gastrointestinal tract; they scavenge free radicals and may interact with reactive carbonyls, enzymes and proteins. These all reactions results in decreasing the absorption of reactive carbonyls and possible other cytotoxic compounds into the plasma. Consumptions of diet high in fat and red meat are contributory risk factors partly due to an increase production of cytotoxic oxidized lipid products eg. MDA. However, the simultaneously consumption of polyphenols rich foods reduce these factors. Locating the biological site of action of polyphenols in the in the gastrointestinal tract may explain the paradox between the protective effect of a highly polyphenols rich diet and the low bioavailability of these molecules in human plasma. It may also explain the "French paradox" and the beneficial effect of Mediterranean and Japanese diets, in which food products with high antioxidants content such as polyphenols are consumed during the meal.

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Jayatissa, Kuruppu. A Metal-Free Approach to Biaryl Compounds: Carbon-Carbon Bond Formation from Diaryliodonium Salts and Aryl Triolborates. Portland State University Library, janeiro de 2000. http://dx.doi.org/10.15760/etd.2226.

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Banin, Amos, Joseph Stucki e Joel Kostka. Redox Processes in Soils Irrigated with Reclaimed Sewage Effluents: Field Cycles and Basic Mechanism. United States Department of Agriculture, julho de 2004. http://dx.doi.org/10.32747/2004.7695870.bard.

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The overall objectives of the project were: (a) To measure and study in situ the effect of irrigation with reclaimed sewage effluents on redox processes and related chemical dynamics in soil profiles of agricultural fields. (b) To study under controlled conditions the kinetics and equilibrium states of selected processes that affect redox conditions in field soils or that are effected by them. Specifically, these include the effects on heavy metals sorption and desorption, and the effect on pesticide degradation. On the basis of the initial results from the field study, increased effort was devoted to clarifying and quantifying the effects of plants and water regime on the soil's redox potential while the study of heavy metals sorption was limited. The use of reclaimed sewage effluents as agricultural irrigation water is increasing at a significant rate. The relatively high levels of suspended and, especially, dissolved organic matter and nitrogen in effluents may affect the redox regime in field soils irrigated with them. In turn, the changes in redox regime may affect, among other parameters, the organic matter and nitrogen dynamics of the root zone and trace organic decomposition processes. Detailed data of the redox potential regime in field plots is lacking, and the detailed mechanisms of its control are obscure and not quantified. The study established the feasibility of long-term, non-disturbing monitoring of redox potential regime in field soils. This may enable to manage soil redox under conditions of continued inputs of wastewater. The importance of controlling the degree of wastewater treatment, particularly of adding ultrafiltration steps and/or tertiary treatment, may be assessed based on these and similar results. Low redox potential was measured in a field site (Site A, KibutzGivat Brenner), that has been irrigated with effluents for 30 years and was used for 15 years for continuous commercial sod production. A permanently reduced horizon (Time weighted averaged pe= 0.33±3.0) was found in this site at the 15 cm depth throughout the measurement period of 10 months. A drastic cultivation intervention, involving prolonged drying and deep plowing operations may be required to reclaim such soils. Site B, characterized by a loamy texture, irrigated with tap water for about 20 years was oxidized (Time weighted average pe=8.1±1.0) throughout the measurement period. Iron in the solid phases of the Givat Brenner soils is chemically-reduced by irrigation. Reduced Fe in these soils causes a change in reactivity toward the pesticide oxamyl, which has been determined to be both cytotoxic and genotoxic to mammalian cells. Reaction of oxamyl with reduced-Fe clay minerals dramatically decreases its cytotoxicity and genotoxicity to mammalian cells. Some other pesticides are affected in the same manner, whereas others are affected in the opposite direction (become more cyto- and genotoxic). Iron-reducing bacteria (FeRB) are abundant in the Givat Brenner soils. FeRB are capable of coupling the oxidation of small molecular weight carbon compounds (fermentation products) to the respiration of iron under anoxic conditions, such as those that occur under flooded soil conditions. FeRB from these soils utilize a variety of Fe forms, including Fe-containing clay minerals, as the sole electron acceptor. Daily cycles of the soil redox potential were discovered and documented in controlled-conditions lysimeter experiments. In the oxic range (pe=12-8) soil redox potential cycling is attributed to the effect of the daily temperature cycle on the equilibrium constant of the oxygenation reaction of H⁺ to form H₂O, and is observed under both effluent and freshwater irrigation. The presence of plants affects considerably the redox potential regime of soils. Redox potential cycling coupled to the irrigation cycles is observed when the soil becomes anoxic and the redox potential is controlled by the Fe(III)/Fe(II) redox couple. This is particularly seen when plants are grown. Re-oxidation of the soil after soil drying at the end of an irrigation cycle is affected to some degree by the water quality. Surprisingly, the results suggest that under certain conditions recovery is less pronounced in the freshwater irrigated soils.

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