5´-alkoxy-2,2´-bithiophene azo dyes: a novel promising series of NLO chromophores

• Autor(a) principal: Raposo, M. Manuela M.
• Data de Publicação: 2008
• Outros Autores: Ferreira, Ana M. P. F., Belsley, M., Moura, João C. V. P.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/7841
• topic: Synthesis; Azo coupling; 5-alkoxy-2,2´-bithiophene couplers; Heterocyclic azo dyes; Solvatochromic probes; UV-visible spectroscopy; Thermal stability; Nonlinear optics (NLO) applications; Donor-acceptor conjugated systems; First hyperpolarizability; nonlinear optics (NLO); Science & Technology

A series of bithienyl azo dyes has been prepared from their corresponding coupling components, 5-alkoxy-2,2´-bithiophenes. The solvatochromic behavior of the compounds was investigated. The hyperpolarizabilities β of derivatives 3-5 were measured using hyper-Rayleigh scattering and thermogravimetric analysis (TGA) was used to evaluate their thermal stability. The experimental results indicate that, good nonlinearity-thermal stability is well balanced for azo-bithiophene NLO-chromophores 3-5 making them good candidates for NLO applications.