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- W2134933386 abstract "We report the synthesis of the five-coordinate Schiff-base complexes, (cyc)salenGaCl, (cyc)salenGa(N3), (et)salenGaCl, and (et)salenGa(N3) ((cyc)salenH2 = N,N′-bis-(3,5-di-tert-butylsalicylidene)-1,2-cyclohexyldiimine and (et)salenH2 = N,N'-bis-(3,5-di-tert-butylsalicylidene)-1,2-ethylenediimine). The four complexes exhibit distorted square pyramidal geometry with the salen ligand forming the basal plane and the chloride or azide in the apical position. Copolymerization studies were conducted with cyclohexene oxide and carbon dioxide utilizing these derivatives as potential catalysts. In the presence of a Lewis-base co-catalyst, N-methylimidazole or phosphine, formation of polymer is not observed. In the absence of N-methylimidiazole, low molecular weight homopolymer is observed when the chloride species is the catalyst. This is in contrast to studies conducted with (cyc)salenCr(III)Cl, (et)salenCr(III)Cl, or azide derivatives thereof, which produced high-molecular-weight polycyclohexylcarbonate with CO2 incorporation >99% in the presence of N-methylimidazole or phosphines. To cite this article: D.J. Darensbourg, D.R. Billodeaux, C. R. Chimie 7 (2004). Nous décrivons la synthèse des complexes pentacoordinés suivants, possédant des ligands bases de Schiff, (cyc)salenGaCl, (cyc)salenGaN3, (et)salenGaCl, (et)salenGaN3, ∑. Ces quatre complexes possèdent une géométrie pyramidale à base carrée déformée, le ligand salen forme la base carrée et les ligands chlorure ou nitrure occupent les positions apicales. Des études de copolymérisation ont été menées avec l'oxyde de cyclohexène et le dioxyde de carbone en utilisant les dérivés du gallium comme catalyseurs potentiels. En présence d'un co-catalyseur tel qu'une base de Lewis (la N-méthylimidazole ou une phosphine), aucune formation de polymère n'est observée. En l'absence de co-catalyseur, des homopolymères de bas poids moléculaires sont formés. Ces résultats se démarquent de ceux obtenus en utilisant le complexe (cyc)salenCr(III)Cl, qui produit des polycyclohéxylcarbonate à haut poids moléculaire, avec une incorporation de CO2 supérieure à 99% en présence de N-méthylimidazole. Pour citer cet article : D.J. Darensbourg, D.R. Billodeaux, C. R. Chimie 7 (2004)." @default.
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- W2134933386 date "2004-08-01" @default.
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- W2134933386 title "Five-coordinate Schiff base complexes of gallium. Potential catalysts for the copolymerization of carbon dioxide and epoxides" @default.
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- W2134933386 doi "https://doi.org/10.1016/j.crci.2003.11.013" @default.
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