New efficient and thermally stable NLO-chromophores 4-5 based on a thienylpyrrolyl donor πconjugated bridge and a benzimidazolyl acceptor moieties were developed by a one step Na 2 S 2 O 4 reduction of substituted o-nitroanilines in the presence of formyl-thienylpyrroles. Abstract -A new series of thermally stable benzimidazole-based nonlinear optical (NLO)chromophores 4-5 has been developed. These chromophores possess a thienylpyrrolyl πconjugated system attached to functionalized benzimidazole heterocycles. This feature leads to robust chromophores with excellent solvatochromic properties, high thermal stabilities and good molecular optical nonlinearities.

The synthesis and full characterization of new chromophores with secondorder nonlinearities containing thienylpyrrolyl and benzothiazolyl moieties are reported. The solvatochromic behavior of the compounds was investigated. The hyperpolarizabilities β of derivatives 4-6 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 specially for chromophores 6b-c, making them good candidates for NLO applications.

New thermally stable heterocyclic chromophores 3-6 based on a (oligo)thiophene πconjugated bridge and a imidazo-phenanthroline moiety were synthesized in moderate to excellent yields by condensation of 5,6-phenanthroline-dione with formyl (oligo)thiophenes 1-2 in the presence of ammonium acetate in glacial acetic acid.

Novel colorimetric receptors for fluoride ion sensing containing anthraquinone as a chromogenic signaling unit and imidazo-2,2'-bithiophene binding sites are reported. Well-defined color change was observed upon addition of fluoride ions to acetonitrile solutions of receptors 2. Compounds 2a-c, deprotonated after fluoride ion addition, were studied as metal ion chemosensors in the presence of Zn(II), Hg(II), and Cu(II) in acetonitrile solutions, especially compound 2a which displayed a marked change from pink to yellow-gold colors upon complexation.