
handle: 10773/3209
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
Hidróxidos duplos laminares, Química, Complexos metálicos, Argilas
Hidróxidos duplos laminares, Química, Complexos metálicos, Argilas
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