Síntese e Análise Estrutural de Novos Dihaloorganoteluratos(II) Monoaniônicos. / Synthesis and structural analysis of new monoanionic dihaloorganyltellurates(II).

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

In this dissertation the synthesis and structural characterization of the new series of monoanionic dihaloorganyltellurates(II) compounds with a general formula (C5H6N)[mesTeX2] is presented. Dimesitylditelluride (mesTe)2 reacts with resublimed iodine in toluene and then with (C5H6N)+X- (X = I, Br e Cl), to give the compounds: (C5H6N)[mesTeI2] (1), (C5H6N)[mesTeIBr] (2) and (C5H6N)[mesTeICl] (3). The synthesis of (C5H6N)[mesTeBr2] (4) and (C5H6N)[mesTeBrCl] (5) occurred by the reaction of dimesitylditelluride (mesTe)2, bromine and pyridinium halides (C5H6N)+X-, X = Br (4) and Cl (5), in toluene. The compound (C5H6N)[mesTeCl2] (6) was obtained by the reaction of dimesitylditelluride, chlorine e pyridinium chloride (C5H6N)+Cl-, in toluene. The compounds 1 and 2 belong to the monoclinic space group P21/n, 3 to the orthorhombic, space group P212121. The compounds 4, 5 and 6 crystallizes in the space group P21/c, monoclinic system. The compounds show general structural characteristic and are very similar because they present a relationship tellurium-halide secondary bond and hydrogen bonds with the halides. The anionic fragments [mesTeI2]- and [mesTeIBr]- of 1 and 2 are assembled as dimers by reciprocal, secondary Te...X interactions, linked also to the pyridinium cations through μ-NH...X bonding. The compounds 3, 4, 5 and 6 do not presents secondary bonds Te...X, only (NH...X) hydrogen bonds, between the anionic fragments [mesTeX2]- and the pyridinium cations (C5H6N)+.

ASSUNTO(S)

aspectos estruturais química química orgânica compostos de telúrio quimica

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