Alkoxy substituted (E,E)-3,6-bis(styryl)pyridazine—a photosensitive mesogen for liquid crystals
作者:Thorsten Lifka、Georg Zerban、Peter Seus、Annette Oehlhof、Herbert Meier
DOI:10.1016/j.tet.2008.04.033
日期:2008.6
(E,E)-3,6-Bis(styryl)pyridazines (3a-t) bearing 2, 4 or 6 alkoxy chains were prepared by applying the Siegrist reaction of 3,6-dimethylpyridazine (13) and the corresponding azomethines 10a-t. The transversal dipole moment of these calamitic compounds effects an extremely high tendency for self-organization in thermotropic LC phases (N, S-A, S-B, S-C, S-E, S-1/F and Cub). The conjugated core structure represents moreover a chromophore with a high photosensitivity for (E,E) reversible arrow (E,Z) isomerization reactions: this property makes the compounds interesting for optical imaging and switching techniques. (c) 2008 Published by Elsevier Ltd.
(E,E)-3,6-二联苯基吡喃系物(3a-t类)通过应用西格里反应制备,使用的底物是3,6-二甲基吡啶(13)和对应的亚胺4a-t或10a-t。这些变形色液态晶体相(N, S-A, S-B, S-C, S-E, S-1/F和 Cub)的交叉偶极矩导致它们展现出极强的自组织倾向,尤其是高热力学稳定性和极性。这些共轭中心结构也具有高感光性,尤其是对于(E,E)可逆逆向的(E,Z)异构转变反应,这种特性使其成为光学成像和转态切换技术中很有兴趣的研究对象。
(c) 2008 版权所有,Elsevier Ltd.