Stereocontrolled Synthesis and Optical Properties of All-cis Poly(phenylene vinylenes) (PPVs): A Method for Direct Patterning of PPVs
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- 作者：Hiroyuki Katayama ; Masato Nagao ; Tatsuro Nishimura ; Yukio Matsui ; Kazutoshi Umeda ; Kensuke Akamatsu ; Takaaki Tsuruoka ; Hidemi Nawafune ; and Fumiyuki Ozawa
- 刊名：Journal of the American Chemical Society
- 出版年：2005
- 出版时间：March 30, 2005
- 年：2005
- 卷：127
- 期：12
- 页码：4350 - 4353
- 全文大小：241K
- 年卷期：v.127,no.12(March 30, 2005)
- ISSN：1520-5126
文摘
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 bothin solution and in the solid. This phenomenon is applied to direct microscale patterning of PPVs onto aquartz substrate.