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Anais da Academia Brasileira de Ciências

versão impressa ISSN 0001-3765versão On-line ISSN 1678-2690

Resumo

GIMENEZ, Iara F.  e  ALVES, Oswaldo L.. Thermal properties of metal-metal bonded Pd(I) complexes supported onto porous Vycor glass. An. Acad. Bras. Ciênc. [online]. 2008, vol.80, n.2, pp.263-269. ISSN 0001-3765.  http://dx.doi.org/10.1590/S0001-37652008000200004.

Thermal behavior of the complexes Pd2(dppm)2Cl2, Pd2(dppm)2(SnCl3)Cl and Pd2(dppm)2(SnCl3)2 (dppm = bis[diphenylphosphino(methane)], ((C6H5)2PCH2P(C6H5)2) in the solid state and immobilized onto porous Vycor glass was studied. Similar decomposition mechanisms were observed for the solid and immobilized complexes, with a small thermal stabilization upon immobilization. The decomposition products were characterized by X-ray diffractometry, Raman and diffuse reflectance infrared spectroscopy, which indicated the presence of a mixture of metallic palladium and oxidized species such as PdO,condensed phosphates, SnO2 and SnP2O7. According to X-ray diffractometry, the decomposition products of the immobilized complexes presented higher amounts of PdO than the solid-state residues, probably as an effect of interactions with silanol groups present in the glass surface.

Palavras-chave : palladium(I) complex; porous Vycor glass; bis[diphenylphosphino(methane)]; thermogravimetric analysis.

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