title: Preparation of 4,4-diaryl-2-(tricyanoethenyl)dithienosiloles and vapor-chromic behavior of the film.
abstract: [reaction: see text] Reactions of 4,4-diphenyl- and 4,4-di(p-tolyl)dithienosilole with tetracyanoethene (TCNE) in DMF gave coupling products 4,4-diphenyl- and 4,4-di(p-tolyl)-2-(tricycanoethenyl)dithienosilole (1a and 1b) in good yield. The films of 1b exhibited vapor-chromism, and the color of the film changed from red to blue-purple upon exposure to the vapor of organic solvents such as ethanol, methanol, acetonitrile, ethyl acetate, acetone, and hexane. The color reverted to the original red upon contact with chloroform vapor, indicating that this process is reversible.
authors.affiliation: Institute for Fundamental Research of Organic Chemistry, Kyushu University, Fukuoka 812-8581, Japan. akunai@hiroshima-u.ac.jp
authors.forename: Joji
authors.initials: J
authors.lastname: Ohshita
authors.forename: Kwang-Hoi
authors.initials: KH
authors.lastname: Lee
authors.forename: Mimi
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Kunugi
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Harima
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yamashita
authors.forename: Atsutaka
authors.initials: A
authors.lastname: Kunai