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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Síntese e Análise Estrutural de Clusters Derivados de Bis(fenilseleneto) de Cádmio Cd(SePh)2 / Synthesis and Structural Analysis of Clusters Derivative from Cadmium Bis(phenylselenolate) - Cd(SePh)2

Stieler, Rafael 31 July 2009 (has links)
Conselho Nacional de Desenvolvimento Científico e Tecnológico / This work deals with the synthesis and structural analysis of clusters derivative from cadmium bis(phenylselenolate) - Cd(SePh)2. The methodology for the synthesis was based on the use of Cd(SePh)2 as a starting material, as well as in the in situ generation of the chemical intermediary PhSeCdX (X = Cl, Br, I). These compounds are considered basic building blocks for the synthesized clusters. Through solvothermal conditions and the use of different kinds of phosphine ligands, five new cadmium clusters were obtained. The compounds synthesized were: [Cd4(SePh)7(PPh3)Cl]n (1), [Cd4(SePh)7(PPh3)Br]n (2), [Cd(SePh)(PCy3)Br]2 (3), [Cd(SePh)(PCy3)I]2 (4) and [Cd4(SePh)7(PCy3)Br]n (5). A structural study in the solid state of these compounds was carried out using the X-ray diffraction on single crystal method. All compounds were characterized by elemental analysis, infrared spectroscopy and energy dispersive X-ray spectroscopy. / Este trabalho apresenta o estudo relacionado à síntese e a análise estrutural de clusters derivados de bis(fenilseleneto) de cádmio - Cd(SePh)2. A metodologia de síntese baseou-se na utilização do Cd(SePh)2 como material de partida e na geração in situ do intermediário químico PhSeCdX (X = Cl, Br, I). Estes são considerados blocos de montagem básicos dos clusters sintetizados. Através de condições solvotermais e do uso de diferentes ligantes do tipo fosfina, cinco novos clusters de cádmio foram obtidos. Os compostos sintetizados foram: [Cd4(SePh)7(PPh3)Cl]n (1), [Cd4(SePh)7(PPh3)Br]n (2), [Cd(SePh)(PCy3)Br]2 (3), [Cd(SePh)(PCy3)I]2 (4) e [Cd4(SePh)7(PCy3)Br]n (5). Efetuou-se um estudo estrutural desses compostos no estado sólido, utilizando como ferramenta principal a difração de raios-X em monocristal. Todos os compostos foram caracterizados por análise elementar, espectroscopia no infravermelho e espectroscopia de energia dispersiva de raios-X.

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