Estudo das propriedades estruturais e desenvolvimento de eletrodos modificados de novas porfirinas polimetaladas

• Ano de defesa: 2003
• Autor(a) principal: Dinelli, Luís Rogério
• Orientador(a): Batista, Alzir Azevedo
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Carlos
• Programa de Pós-Graduação: Programa de Pós-Graduação em Química - PPGQ
• País: BR
• Palavras-chave em Português: Complexos metálicos; Sensores eletroquímicos; Macromoléculas; Metaloporfirinas; Biofosfina
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA::QUIMICA
• Link de acesso: https://repositorio.ufscar.br/handle/20.500.14289/6366

In this work we synthetisized and characterized different polymetallated pophyrins, using as precursors 5,10,15,20-piridilporphyrin and [RuCl2(CO(DMF)(PPh3)2], cis-[RuCl2(bipy)(dppb)] and mer-[RuCl3(dppb)(H2O)] as peripherical componds. The internal metals into de macrocyclic porphyrin were Co(II), Ni(II), Cu(II) and Zn(II). These complexes were characterized by several techciques such as, absorptional spectroscopy in the visible, utraviole and near infrared region, vibracional spectroscopy, cyclic voltammetry, X-ray crystallography and elemental analyses of carbon, hydrogen and nitrogen. Modified electrode was obtained using the porphyrin {Co(II)-[RuCl2(dppb)]4} by cyclic voltammetry. The modified electrode was obtained in carbon vitreos and the proposed mechanism for the formation of the film was consolidated with the existence of the intervalence transition in the near infrared, which one was attributed to intervalence transition Ru(II) → Ru(III). Such modified electrode was used for the determination, using the technique of cyclic voltammetry, of hydroquinone, 1,4-benzoquinone, dopamine, catecol, ascorbic acid and paracetamol. Dopamine and paracetamol were also analyzed in commercial medicines. Dopamine was determined in the µmol concentrations range usin squere wave voltammetry technique. The X-ray structure of to the porphyrin {Ni(II)-[RuCl3(dppb)]4} was determined. Modified electrode, obtained with the pophyron {H2-TPyP[RuCl3(dppb)]4} using the same procedure, was used as potenciometric sensor for pH measures. Langmuir-Blodgett films were obtained with the porphyrin {H2-TPyP[RuCl3(dppb)]4.