A new oxovanadium(IV)-cucurbit[6]uril complex: Properties and potential for confined heterogeneous catalytic oxidation reactions
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Data
2010-10-14
Autores
de Lima, Silvania Marilene
Gomez, Jorge Antonio
Barros, Valeria P.
Vertuan, Greice de S.
Assis, Marilda das Dores
Graeff, Carlos Frederico de Oliveira [UNESP]
Demets, Gregoire Jean-Francois
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Editor
Pergamon-Elsevier B.V. Ltd
Resumo
This work presents a new oxovanadium(IV)-cucurbit[6]uril complex, which combines the catalytic properties of the metal ion with the size-excluding properties of the macrocycle cavity. In this coordination compound, the VO(2-) ions are coordinated to the oxygen atoms located at the rim of the macrocycle in slightly distorted square-pyramidal configurations, which are in fact C(2v) symmetries. This combination results in a size-selective heterogeneous catalyst, which is able to oxidize linear alkanes like n-pentane at room temperature, but not styrene, cyclohexane or z-cyclooctene, which are too big to enter the cucurbit[6]uril cavity. The results presented here contribute to understanding the mechanism of alkane catalytic oxidation by oxovanadium(IV) complexes. (C) 2010 Elsevier Ltd. All rights reserved.
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Palavras-chave
Cucurbit[6]uril, Oxovanadium(IV), Coordination compound, Size-selective catalysis
Como citar
Polyhedron. Oxford: Pergamon-Elsevier B.V. Ltd, v. 29, n. 15, p. 3008-3013, 2010.