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Argilas aniónicas multifuncionais

Authors: Monteiro, Bernardo Ramos Batista;

Argilas aniónicas multifuncionais

Abstract

O presente trabalho aborda a imobilização de vários complexos do tipo dioxomolibdénio(VI), dioxotungsténio(VI) e de cobre(II) em suportes do tipo hidróxidos duplos lamelares (LDHs). Numa primeira parte descrevem-se os suportes LDHs e a síntese e caracterização em solução e estado sólido de complexos catecolato cis-MoO2 e cis-WO2. Investigou-se depois a química de intercalação deste tipo de complexos, nomeadamente a influência dos LDHs percursores, temperatura de intercalação, excesso de anião e mudança de metal no complexo intercalado (M=Mo, W). De seguida foi estudada a imobilização de oxocomplexos de molibdénio(VI) num LDH com pilares de bipiridina dicarboxilato e procedeu-se à avaliação da sua aplicabilidade em reacções catalíticas de oxidação de álcoois e olefinas. Com o objectivo de desenvolver as aplicações dos LDHs com pilares foi estudada a imobilização de um complexo de cobre(II) neste material e avaliada a sua aplicação como catalizador na oxidação de substratos orgânicos.

The present work concerns the immobilization of dioxomolybdenum(VI), dioxotungsten(VI) and copper(II) complexes in Layered Double Hydroxide (LDH) supports. Firstly, the LDH supports and the synthesis and characterisation (in solution and in the solid state) of catecholato complexes of cis-MoO2 and cis- WO2 are described. The intercalation chemistry of this type of complexes was then investigated, namely with respect to the influence of the LDH precursor, intercalation temperature, anion excess and the change of the metal in the complex (M=Mo, W). Following this study, an oxomolybdenum(VI) complex was immobilized in an LDH pillared with bipyridinedicarboxylate anions and the application of the resultant material in catalytic reactions of olefin and alcohol oxidation was evaluated. With the aim of developing the applications of the pillared LDH, a copper(II) complex was immobilized and examined as a catalyst in the oxidation of several organic substrates.

Doutoramento em Química

Country
Portugal
Related Organizations
Keywords

Hidróxidos duplos laminares, Química, Complexos metálicos, Argilas

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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