863643-48-5Relevant articles and documents
Effect of alkoxy terminal chain length on mesomorphism of 1,6-disubstituted pyrene-based hexacatenar liquid crystals: Columnar phase control
Hirose, Takuji,Takai, Hiroaki,Watabe, Mizuki,Minamikawa, Hiroyuki,Tachikawa, Tatsuya,Kodama, Koichi,Yasutake, Mikio
, p. 5100 - 5108 (2014/07/08)
Synthesis and mesophase-transition behaviors of six 1,6-disubstituted pyrene-based hexacatenar liquid crystals 1n (n=8-18) are reported here. They were synthesized by the Sonogashira coupling between 1,6-diethynylpyrene and 2-bromothiophene bearing a trialkoxybenzoyl group. The phase-transition behavior was studied by differential scanning calorimetry and polarized optical microscopy; a few mesophase progressions, I-Col/I-X-Col and Col-Sm, were observed, where X was an optically isotropic but unidentified phase. The structures of Colr, Colh, and Sm phases were analyzed by the X-ray crystallography, and the effect of the terminal alkoxy chain length on the mesomorphism was evaluated.
Effect of alkoxy terminal chain length on mesomorphism of 1,6-disubstituted pyrene-based hexacatenar liquid crystals: Columnar phase control
Hirose, Takuji,Takai, Hiroaki,Watabe, Mizuki,Minamikawa, Hiroyuki,Tachikawa, Tatsuya,Kodama, Koichi,Yasutake, Mikio
, p. 5100 - 5108 (2014/12/10)
Synthesis and mesophase-transition behaviors of six 1,6-disubstituted pyrene-based hexacatenar liquid crystals 1n(n=8-18) are reported here. They were synthesized by the Sonogashira coupling between 1,6-diethynylpyrene and 2-bromothiophene bearing a trialkoxybenzoyl group. The phase-transition behavior was studied by differential scanning calorimetry and polarized optical microscopy; a few mesophase progressions, I-Col/I-X-Col and Col-Sm, were observed, where X was an optically isotropic but unidentified phase. The structures of Colr, Colh, and Sm phases were analyzed by the X-ray crystallography, and the effect of the terminal alkoxy chain length on the mesomorphism was evaluated.
Synthesis and property studies of linear and kinked poly(pyreneethynylene)s
Gupta, Jhinuk,Vadukumpully, Sajini,Valiyaveettil, Suresh
scheme or table, p. 5078 - 5086 (2011/11/28)
A series of fluorescent conjugated polymers, poly(pyreneethynylene)s, have been designed and synthesized to investigate the effect of shape of polymer backbone on physical properties. Polymers with linear and kinked backbone were synthesized using 1,6- and 1,8-disubstituted pyrene. The target copolymers were designed to incorporate various spacer units, such as, alkoxyphenyl, carbazole and fluorene on the polymer backbone. Characterization of the target compounds was achieved by NMR, IR, GPC and MALDI-TOF mass spectrometry. Detailed investigation on their optical, electrochemical and thermal properties revealed significant contribution of the geometry of polymer backbone towards physical properties. Kinked backbone of cisoid-polymers was found to result in lower optical band gap, less negative EHOMO and higher thermal stability as compared to their linear analogues, most probably due to the coiling of polymer chains. Comparison of the physical properties of the polymers with those of the model compounds suggested similar extent of conjugation through 1,6- and 1,8-position of pyrene.
