Helically π-Stacked Conjugated Polymers Bearing Photoresponsive and Chiral Moieties in Side Chains: Reversible Photoisomerization-Enforced Switching Between Emission and Quenching of Circularly Polarized Fluorescence
Helically π-Stacked Conjugated Polymers Bearing Photoresponsive and Chiral Moieties in Side Chains: Reversible Photoisomerization-Enforced Switching Between Emission and Quenching of Circularly Polarized Fluorescence
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DOI：
10.1002/adfm.200902059
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发表时间：
2010-04-23
影响因子：
19
通讯作者：
Akagi, Kazuo
中科院分区：
文献类型：
--
作者：
Hayasaka, Hiroyuki;Miyashita, Tatsuaki;Akagi, Kazuo
设计并合成了具有荧光、手性和光响应性的新型多功能共轭聚合物聚对苯撑和聚联噻吩-苯撑。该聚合物由π-共轭主链组成，其中聚（对亚苯基）和聚（亚联噻吩基-亚苯基）是荧光部分，并且光致变色二噻吩基乙烯部分的侧链与手性烷基连接。该聚合物薄膜表现出右或左手的圆偏振荧光（CPF），也显示可逆的猝灭和发射行为的二噻吩基乙烯部分的光化学异构化的结果时，用紫外线和可见光照射。这是首次报道利用手性和光响应特性实现CPF的可逆开关。
Novel multifunctional conjugated polymers, [poly( p-phenylene)s and poly(bithienylene-phenylene)s with (R)- and (S)-configurations], which have fluorescence, chirality, and photoresponsive properties, have been designed and synthesized. The polymers are composed of pi-conjugated main chains, where poly(p-phenylene) and poly(bithienylene-phenylene) are fluorescence moieties, and the side chains of the photochromic dithienylethene moiety are linked with chiral alkyl groups. The polymer films exhibit right- or left-handed circularly polarized fluorescence (CPF) and also show reversible quenching and emitting behaviors as a result of photochemical isomerization of the dithienylethene moiety upon irradiation with ultraviolet and visible light. This is the first report realizing the reversible switching of CPF using chirality and photoresponsive properties.