Relevant bibliographies by topics / Metal zerovalent complexe

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Academic literature on the topic 'Metal zerovalent complexe'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Metal zerovalent complexe"

1

Doong, R. A., C. C. Lee, K. T. Chen, and S. F. Wu. "Coupled reduction of chlorinated hydrocarbons and heavy metals by zerovalent silicon." Water Science and Technology 50, no. 8 (October 1, 2004): 89–96. http://dx.doi.org/10.2166/wst.2004.0495.

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The feasibility of using zerovalent silicon (Si0) as a novel reductant to remove chlorinated ompounds and heavy metals in contaminated sites was investigated. The kinetics and degradation mechanism of carbon tetrachloride (CT) by Si0 were also examined. Results showed that zerovalent silicon could effectively dechlorinate the chlorinated compounds. A nearly complete dechlorination of CT by Si0 was obtained within 14 h. The produced concentrations of chloroform (CF) accounted for 71-88% loss of CT, showing that reductive dechlorination is the major degradation pathway for the degradation of chlorinated hydrocarbons by Si0. The degradation followed pseudo first-order kinetics and the normalized surface reaction rate constant (ksa) for CT dechlorination ranged between 0.0342 and 0.0454 L m-2 h-1 when CT concentrations were in the range of 3-20 μM. A linear relationship between the ksa and pH value was also established. In addition, zerovalent silicon has a high capability in the removal of heavy metals. 83% of Cr(VI) was removed by 0.5g Si0 within 5 h, which is higher than that by Fe0. The removal efficiency of divalent metal ions by Si0 followed the order of Cu(II) > Pb(II) > Ni(II). This indicates that zerovalent silicon is an alternative reductant and can undergo coupled reduction of heavy metals and chlorinated hydrocarbons in contaminated groundwater.
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2

Bennett, Martin A. "Aryne Complexes of Zerovalent Metals of the Nickel Triad." Australian Journal of Chemistry 63, no. 7 (2010): 1066. http://dx.doi.org/10.1071/ch10198.

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The chemistry of dihapto-aryne complexes of the zerovalent Group 10 metals of general formula [M(η2-aryne)L2] (M = Ni, Pd, Pt; L = various tertiary phosphines) is reviewed, with emphasis on the highly reactive nickel(0) compounds (aryne = benzyne, C6H4; 4,5-difluorobenzyne, 4,5-C6H2F2; 2,3-naphthalyne, 2,3-C10H6; L2 = 2 PEt3, 2 PiPr3, 2 PCy3, dcpe). These can be generated by alkali metal reduction of the appropriate (2-halogenoaryl)nickel(ii) halide precursors, such as [NiX(2-XC6H4)L2], which in turn are accessible by oxidative addition of the 1,2-dihaloarene to nickel(0) precursors such as [Ni(1,5-COD)2]. The X-ray structure of [Ni(η2-C6H4)(dcpe)] shows that this compound is a typical 16-electron Ni(0) (3d10) species in which benzyne acts as a 2π-electron donor. Several unusual organonickel compounds derived from [Ni(η2-4,5-C6H2F2)(PEt3)2] have been isolated recently, including [Ni2(μ-η2:η2-4,5-C6H2F2)(PEt3)4], in which a 4π-electron donor 4,5-difluorobenzyne is located at right-angles to a pair of nickel atoms. Free benzyne can be intercepted by both [Ni(η2-C2H4)(dcpe)] and [Pt(η2-C2H4)(PPh3)2], but the resulting benzyne complexes rapidly insert benzyne to give the appropriate η1:η1-2,2′-biphenylyl complexes. [Pt(η2-C6H4)(PPh3)2] also undergoes rapid ortho-metallation to give [PtPh(2-C6H4PPh2)(PPh3)]. However, a trapping reaction has been used to make the first 1,4-benzdiyne complex, [{Ni(dcpe)2}2(μ-η2:η2-1,4-C6H2)] by treatment of the 4-fluorobenzyne complex [Ni(η2-4-FC6H3)(dcpe)] with LiTMP. The use of alkali metals in the preparation of the η2-benzyne complexes is avoided in a more recently developed procedure, which starts from (2-bromophenyl)boronic acid, and is based on Suzuki–Miyaura coupling. This procedure has made accessible for the first time an aryne complex of palladium(0), [Pd(η2-C6H4)(PCy3)2], and the labile nickel(0) complex [Ni(η2-C6H4)(PPh3)2]. The aryne-nickel(0) complexes Ni(η2-aryne)L2 (L2 = 2 PEt3, dcpe) undergo sequential insertions into the aryne-metal bond with unsaturated molecules, such as CO, C2F4, substituted alkynes, substituted diynes, alkynylphosphines, and alkynyl thioethers, often with considerable regioselectivity. After the reductive elimination of two nickel-carbon σ-bonds, a variety of interesting polycyclic compounds can be obtained.
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Braunschweig, Holger, Carina Brunecker, Rian D. Dewhurst, and Christoph Schneider. "Does Lewis basicity correlate with catalytic performance in zerovalent group 8 complexes?" Zeitschrift für Naturforschung B 73, no. 3-4 (April 25, 2018): 149–53. http://dx.doi.org/10.1515/znb-2017-0193.

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AbstractA set of 18 zerovalent group 8 metal complexes of the form [MLn(CO)5−n] (M=Fe, Ru, Os; L=neutral donor;n=0–2) were screened for their catalytic performance in aldehyde hydrosilylation and olefin hydroboration reactions. Although none of the untested catalysts were found to perform better than the previously-published complex [Fe(CO)4(IMes)] (IMes=1,3-Dimesityliidazol-2-ylidene), the results suggest that the Lewis basicity of the metal complex does not play a critical role in the catalysis of these two reactions.
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4

Kovbasyuk, Larisa A., Olga Yu Vassilyeva, Vladimir N. Kokozay, Wolfgang Linert, and Paul R. Raithby. "A Mixed-metal Mixed-halide Complex Prepared from Zerovalent Copper and Lead Salts: Solution and Solid-state Chemistry." Journal of Chemical Research 23, no. 11 (November 1999): 670–71. http://dx.doi.org/10.1177/174751989902301117.

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The mixed-metal mixed-halide complex [CuPbBrlL2]2 has been prepared by the direct interaction of zerovalent copper with lead halides and 2-dimethylaminoethanol (HL) in dmso and has been characterized by X-ray crystallography; the structure shows a layer arrangement of the tetranuclear metal units through the μ3-halogen bridging.
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Branzan, Ramona M. C., Jutta Kösters, Mareike C. Jahnke, and F. Ekkehardt Hahn. "Oxidative addition of N-ether-functionalized 2-chlorobenzimidazole to d10 metals." Zeitschrift für Naturforschung B 71, no. 10 (October 1, 2016): 1077–85. http://dx.doi.org/10.1515/znb-2016-0137.

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AbstractReaction of 2-chloro-N-(methoxymethyl)benzimidazole 1 with zerovalent group 10 metal complexes in the presence of an additional proton source yielded, via an oxidative addition of the C2–Cl bond, complexes with a protic NH,NR-substituted (R=methoxymethyl) benzimidazolin-2-ylidene ligand. The oxidative addition of 1 to Ni0 and Pd0 complexes proceeded with the exclusive formation of the trans-configured complexes trans-[2]BF4 and trans-[3]BF4, respectively. Contrary to this observation, the reaction of 1 with a more substitution inert Pt0 complex leads, depending on the reaction temperature, to a mixture of cis-/trans-[4]BF4 or exclusively to trans-[4]BF4. The molecular structures of all three trans-configured complexes were determined.
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6

Cavell, Ronald G., and Ian G. Phillips. "Reactions of Cyclopolyphosphines with Zerovalent Platinum Group Metal Complexes." Phosphorous and Sulfur and the Related Elements 30, no. 1-2 (March 1987): 117–20. http://dx.doi.org/10.1080/03086648708080536.

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7

Fischer, Paul J., Shuruthi Senthil, Jeremy T. Stephan, McKinley L. Swift, Meghan D. Storlie, Emily T. Chan, Matthew V. Vollmer, and Victor G. Young. "Inductive modulation of tris(phosphinomethyl)phenylborate donation at group VI metals via borate phenyl substituent modification." Dalton Transactions 47, no. 17 (2018): 6166–76. http://dx.doi.org/10.1039/c8dt00703a.

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New tris(phosphinomethyl)phenylborate ligands were synthesized to examine tuning of PhBPPh3 donation via inductive modulation of the borate charge. Cyclic voltammetry suggests that rational tuning of this type occurs in complexes of zerovalent metals.
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8

Braunschweig, Holger, Rian D. Dewhurst, Florian Hupp, Christina Kaufmann, Ashwini K. Phukan, Christoph Schneider, and Qing Ye. "Gauging metal Lewis basicity of zerovalent iron complexes via metal-only Lewis pairs." Chemical Science 5, no. 10 (July 15, 2014): 4099. http://dx.doi.org/10.1039/c4sc01539h.

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9

Barrera, Gabriele, Paola Tiberto, Paolo Allia, Barbara Bonelli, Serena Esposito, Antonello Marocco, Michele Pansini, and Yves Leterrier. "Magnetic Properties of Nanocomposites." Applied Sciences 9, no. 2 (January 9, 2019): 212. http://dx.doi.org/10.3390/app9020212.

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The magnetic properties of various families of nanocomposite materials containing nanoparticles of transition metals or transition-metal compounds are reviewed here. The investigated magnetic nanocomposites include materials produced either by dissolving a ferrofluid containing pre-formed nanoparticles of desired composition and size in a fluid resin submitted to subsequent curing treatment, or by generating the nanoparticles during the very synthesis of the embedding matrix. Two typical examples of these production methods are polymer nanocomposites and ceramic nanocomposites. The resulting magnetic properties turn out to be markedly different in these two classes of nanomaterials. The control of nanoparticle size, distribution, and aggregation degree is easier in polymer nanocomposites, where the interparticle interactions can either be minimized or exploited to create magnetic mesostructures characterized by anisotropic magnetic properties; the ensuing applications of polymer nanocomposites as sensors and in devices for Information and Communication Technologies (ICT) are highlighted. On the other hand, ceramic nanocomposites obtained from transition-metal loaded zeolite precursors exhibit a remarkably complex magnetic behavior originating from the simultaneous presence of zerovalent transition-metal nanoparticles and transition-metal ions dissolved in the matrix; the applications of these nanocomposites in biomedicine and for pollutant remediation are briefly discussed.
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10

Stufkens, Derk J. "Spectroscopy, photophysics and photochemistry of zerovalent transition metal α-diimine complexes." Coordination Chemistry Reviews 104, no. 1 (July 1990): 39–112. http://dx.doi.org/10.1016/0010-8545(90)80040-z.

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Dissertations / Theses on the topic "Metal zerovalent complexe"

1

Tahiri, Mohamed. "Phtalocyanines de fer(i) et de fer(0) : synthese, structure et reactivite." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13043.

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Synthese et caracterisation d'une serie de complexes monoreduits de phtalocyanine de fer de type (fe pc r::(8))**(-) ou r=och::(3), ch::(3), h, cl et cn. On donne les structures par rx de composes monoanioniques et dianionique fe pc**(-) et fe pc**(2-). Proprietes chimiques de fe pc**(2-). De tels especes peuvent etre des modeles d'intermediaires formes dans la reaction de la phenylhydrazine sur la metmyoglobine ou dans le metabolisme de substrats suicides par cytochrome p450
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2

Ruiz-Montes, José. "Alkylations asymetriques de bases de schiff derives de la glycine : application a la synthese d'alpha -amino acides." Paris 6, 1988. http://www.theses.fr/1988PA066518.

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Achi, Sabah Samira. "Nouvelle voie d'acces aux acides alpha -amines, par catalyse homogene a l'aide de complexes de metaux de transition, synthese de nouveaux complexes phosphores chiraux du tungstene pentacarbonyle." Paris 6, 1987. http://www.theses.fr/1987PA066227.

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Wang, Dan Li. "Reaction des metalloporphyrines reduites avec les monohalogenoalcanes et les dihalogenoalcanes vicinaux." Paris 7, 1988. http://www.theses.fr/1988PA077166.

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Huser, Marc. "Carbonylations catalytiques du chlorobenzene et du dichloromethane." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13196.

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Grisoni, Serge. "Synthese biomimetique du cycle c des alcaloides de l'ergot : application, premiere synthese enantioselective de la (-) chanoclavine i." Paris 6, 1987. http://www.theses.fr/1987PA066408.

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Synthese de benzo (cd) indoles a partir de l'indolecarbaldehyde-4 par cyclisation intramoleculaire en presence de pd(o); l'utilisation de bases solides (alumine-kf ou k::(2)co::(3)) permet des conditions operationnelles douces
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7

Alvarez, Gonzalez Eleuterio. "Substitution d'ethers et d'alcools allyliques par differents nucleophiles en presence de complexes de nickel(0) : synthese stereoselective des dienes-1,4 a partir des sulfones dieniques avec le chlorure d'isopropylmagnesium en presence de sels de." Paris 6, 1987. http://www.theses.fr/1987PA066064.

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8

Gaudin, Jean-Marc. "Synthèses sélectives à l'aide de complexes du Palladium(0) : élaboration de chaine latérale de stéroïde (glaucastérol), phéromones et alpha-amino esters d'intérêts biologiques." Paris 6, 1986. http://www.theses.fr/1986PA066536.

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Ce travail porte sur l'utilisation de complexe du palladium (0) en catalyse homogène pour la synthèse de molécules d'intérêts biologiques. Trois applications y sont décrites: - la synthèse d'une phéromone secrétée par la reine des abeilles et d'une hormone végétale : l'acide traumatique. La construction du squelette carbone de ces molécules est basée sur une double alkylation d'une bis (aryl sulfonyl) méthane, l'une d'entre elles faisant intervenir un complexe eta (3) allyl palladien fonctionnalisé ; - la synthèse d'alpha-amino esters susceptibles d'être utilisés comme inhibiteur d'enzyme. Ceci est réalisé par l'alkylation catalysée d'une base de Schiff dérivée de la glycine. Quelques facteurs pouvant influencer l'énantiosélectivité de cette réaction ont été étudiés; - la synthèse de la chaine latérale du glaucasterol. Ce stéroïde marin isolé très récemment à la particularité de posséder dans sa structure un cyclopropane vinylique. La réaction clef est une cyclisation sn' catalysée. Elle s'effectue avec un transfert complet de la chiralité d'un benzoate allylique sur un des carbones cyclopropaniques et permet d'autre part le contrôle de la stéréochimie de la double liaison.
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