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Synthesis and characterization of the thermal and the solvatochromic properties...
Raposo, M. Manuela M.; Ferreira, Ana M. P. F.; Amaro, Mariana; Belsley, M.; Moura, João C. V. P.A series of heterocyclic azo dyes was synthesized by diazotation of several substituted anilines and coupling with 5-N,N-dialkylamino-2,2´-bithiophenes to give 4-phenylazo-5-N,N-dialkylamino-2,2´-bithiophenes 4-7. This reaction contrasts with the behavior of 5-alkoxy-2,2´-bithiophenes towards aryldiazonium salts which gave 5-phenylazo-5-alkoxy-2,2´-bithiophenes. The thermal stability of the derivatives was eval...
5-Arylazo-2,2´-bithiophenes : a novel promising series of NLO chromophores
Raposo, M. Manuela M.; Ferreira, Ana M. P. F.; Belsley, M.; Gomes, E. Matos; Moura, João C. V. P.The synthesis of 5-arylazo- substituted bithiophenes and their UV-visible, solvatochromic and nonlinear optical properties (NLO) are described. In agreement with the solvatochromic data and also with the second-order molecular NLO characterization, the new donor-acceptor systems could find application as suitable solvatochromic probes and also as new NLO materials.
5´-alkoxy-2,2´-bithiophene azo dyes : a novel promising series of NLO chromophores
Raposo, M. Manuela M.; Ferreira, Ana M. P. F.; Belsley, M.; Moura, João C. V. P.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 nonlin...
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