Electrochemical and spectroscopic studies of pyridazine derivatives

• Autor(a) principal: Vieira, L. M .C.
• Data de Publicação: 2004
• Outros Autores: Fonseca, A. M., Raposo, M. Manuela M., Kirsch, G
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/64867
• topic: Synthesis; Pyridazines; Electrochemistry; push-pull pi-congugated molecules; UV-Vis spectroscopy; Ciências Naturais::Ciências Químicas

This work reports on cyclic voltammetry and spectroscopic UV-Vis investigations of some pyridazine derivatives 1-8 in dimethylformamide. In the electrochemical study, monochlorinated pyridazines 2-8 exhibit two reductions but in the case of dichlorinated derivative 1 an additional wave is seen for the reduction of the second carbon-chloride bond. The electronic absorption spectra display an intramolecular charge transfer band π-π* in the UV region of which depend substantially on the nature of both donor and acceptor moieties. These results indicate the π-electron delocalization in the conjugated system.