Synthesis and properties of mono-substituted liquid crystalline polyacetylene derivatives - doping, magnetic orientation, and photo-isomerization
Synthesis and properties of mono-substituted liquid crystalline polyacetylene derivatives - doping, magnetic orientation, and photo-isomerization
复制标题
DOI：
10.1016/j.synthmet.2005.09.044
复制
发表时间：
2005-12-15
期刊：
影响因子：
4.4
通讯作者：
Akagi, K
中科院分区：
文献类型：
--
作者：
Goto, H;Nimori, S;Akagi, K
具有液晶(LC)基团的单取代乙炔单体在铑、铁或钼的络合催化剂上聚合。以5-92%的产率得到了数均相对分子质量为4,000-330000的LC聚乙炔衍生物。用X射线衍射仪、差示扫描量热法和偏光显微镜对其液晶行为进行了研究。用Rh或Fe催化剂制备的聚合物被证实为顺式，并在加热时发生不可逆的反式异构化。通过在侧链中引入偶氮苯部分作为介晶核，成功地合成了具有光响应性的聚乙炔衍生物，这些形式显示了偶氮苯部分的可逆光化学顺反异构化。(C)2005 Elsevier B.V.保留所有权利。
Mono-substituted acetylene monomers with a liquid crystalline (LC) group are polymerized using rhodium, iron or molybdenum complex catalysts. LC polyacetylene derivatives with number-averaged molecular weights of 4000-330000 were obtained in 5-92% yield. The LC behavior is examined by X-ray diffraction, differential scanning calorimetry, and polarizing optical microscopy. The polymers prepared using rhodium or iron catalyst are confirmed to assume a cis form and to undergo an irreversible isomerization to the trans form upon heating. Photo-responsive polyacetylene derivatives are successfully synthesized through the introduction of an azobenzene moiety as a mesogenic core into the side-chain, and these forms exhibit a reversible photochemical cis-to-trans isomerization of the azobenzene moiety. (C) 2005 Elsevier B.V. All rights reserved.