Synthesis of Isothianaphthene (ITN) and 3,4-Ethylenedioxy-Thiophene (EDOT)-Based Low-Bandgap Liquid Crystalline Conjugated Polymers

Aohan Wang; Kohsuke Kawabata; Hiromasa Goto

doi:10.3390/ma6062218

Synthesis of Isothianaphthene (ITN) and 3,4-Ethylenedioxy-Thiophene (EDOT)-Based Low-Bandgap Liquid Crystalline Conjugated Polymers

Materials (Basel). 2013 May 30;6(6):2218-2228. doi: 10.3390/ma6062218.

Authors

Aohan Wang¹, Kohsuke Kawabata², Hiromasa Goto³

Affiliations

¹ Faculty of Pure and Applied Sciences, Division of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan. s-awang@ims.tsukuba.ac.jp.
² Faculty of Pure and Applied Sciences, Division of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan. barbapapa.610@gmail.com.
³ Faculty of Pure and Applied Sciences, Division of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan. gotoh@ims.tsukuba.ac.jp.

Abstract

Copolymers, consisting of isothianaphthene and phenylene derivatives with liquid crystal groups, were synthesized via Migita-Kosugi-Stille polycondensation reaction. IR absorption, UV-vis optical absorption, and PL spectroscopy measurements were carried out. Thermotropic liquid crystallinity of the polymers with bandgap of ~2.5 eV was confirmed.

Keywords: Migita-Kosugi-Stille coupling; isothianaphthene; liquid crystals; pyrimidine; π-conjugated polymers.