title: Stereocontrolled synthesis and optical properties of all-cis poly(phenylene vinylenes) (PPVs): a method for direct patterning of PPVs.
abstract: Geometrically pure, all-cis poly(phenylene vinylenes) (PPVs) are synthesized by Suzuki-Miyaura-type polycondensation of 2,5-dioctyloxy-1,4-benzenediboronic acid with (Z,Z)-bis(2-bromoethenyl)benzenes, which are prepared by ruthenium-catalyzed (Z)-selective double hydrosilylation of diethynylbenzenes, followed by bromodesilylation of the resulting (Z,Z)-bis(2-silylethenyl)benzenes with N-bromosuccinimide. The all-cis PPVs thus obtained undergo one-way photoisomerization to the corresponding trans-PPVs both in solution and in the solid. This phenomenon is applied to direct microscale patterning of PPVs onto a quartz substrate.
authors.affiliation: International Research Center for Elements Science (IRCELS), Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan. hiroyuki@scl.kyoto-u.ac.jp
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Katayama
authors.forename: Masato
authors.initials: M
authors.lastname: Nagao
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Nishimura
authors.forename: Yukio
authors.initials: Y
authors.lastname: Matsui
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Umeda
authors.forename: Kensuke
authors.initials: K
authors.lastname: Akamatsu
authors.forename: Takaaki
authors.initials: T
authors.lastname: Tsuruoka
authors.forename: Hidemi
authors.initials: H
authors.lastname: Nawafune
authors.forename: Fumiyuki
authors.initials: F
authors.lastname: Ozawa