title: Synthesis of dithienosilole-based highly photoluminescent donor-acceptor type compounds.
abstract: Highly photoluminescent acceptor-donor-acceptor (A-D-A) and donor-acceptor (D-A) type compounds with a dithienosilole unit as the donor and perfluorotolyl or dimesitylboryl group(s) as the acceptor were prepared by the reaction of lithiated dithienosilole derivatives with perfluorotoluene or fluorodimesitylborane, respectively. The resulting A-D-A and D-A type compounds showed red-shifted UV absorption and PL bands compared to those of simple dithienosiloles having no acceptor units, reported previously, and were highly photoluminescent in the solid state as well as in solution. Solvatochromic behaviour that would arise from the intramolecular donor-acceptor interaction were observed for the D-A type compounds with respect to the UV absorption and PL spectra. In addition, it was found that bis(dimesitylboryl)dithienosilole and (dimesitylboryl)(methylthio)dithienosilole responded to coexisting fluoride anions, leading to clear UV absorption and PL spectral changes in solutions.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan. jo@hiroshima-u.ac.jp
authors.forename: Joji
authors.initials: J
authors.lastname: Ohshita
authors.forename: Yuta
authors.initials: Y
authors.lastname: Tominaga
authors.forename: Daiki
authors.initials: D
authors.lastname: Tanaka
authors.forename: Yousuke
authors.initials: Y
authors.lastname: Ooyama
authors.forename: Tomonobu
authors.initials: T
authors.lastname: Mizumo
authors.forename: Norifumi
authors.initials: N
authors.lastname: Kobayashi
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Higashimura