title: Red and Near-Infrared Photoluminescence of D-π-A-Type Compounds Based on a 1,4-Diaryl-1-thio-1,3-butadiene Conjugated System in a Dibenzobarrelene Skeleton.
abstract: 1,4-Diaryl-1-thio-1,3-butadiene derivatives having a π-donor dimethylamino group and several π-acceptor substituents at both terminals of the conjugated system were synthesized by intramolecular [4 + 2] cycloaddition of 1-thio-enynes and subsequent chemical transformations. They displayed largely red-shifted absorption and emission spectra in solution, the powder state, and in polymer films. The derivatives with a 2,2-dicyanoethenyl group as the π-acceptor exhibited inverted solvatochromism in both optical absorption and fluorescence spectroscopies.
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Saitama University , 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Ishii
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Saitama University , 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan.
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Makishima
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Saitama University , 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan.
authors.forename: Norio
authors.initials: N
authors.lastname: Nakata