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

• Author(s): Raposo, M. Manuela M. ; Ferreira, Ana M. P. F. ; Belsley, M. ; Moura, João C. V. P.
• Date: 2008
• Persistent ID: http://hdl.handle.net/1822/7841
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): 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
• Document Type: Article
• Language: English

Description

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.