Multiresponsive luminescent dicyanodistyrylbenzenes and their photochemistry in solution and in bulk
Multiresponsive luminescent dicyanodistyrylbenzenes and their photochemistry in solution and in bulk
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DOI：
10.1039/c5tc02852c
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发表时间：
2016-03
影响因子：
6.4
通讯作者：
Marta Martínez‐Abadía;S. Varghese;R. Giménez;M. Ros
中科院分区：
文献类型：
--
作者：
Marta Martínez‐Abadía;S. Varghese;R. Giménez;M. Ros
制备并表征了以二氰二苯基苯为发色团的弯曲核和棒状分子的多响应发光材料。棒状化合物表现为向列或近晶液晶相，而弯核化合物在高温下直接熔化为各向同性液体。荧光特性对外界刺激如热、光、压力和溶剂蒸气非常敏感。所有化合物在紫外照射下在溶液中发生Z/E光异构化。此外，还研究了其光化学活性。在紫外照射下，晶体相稳定，而液晶相不稳定，产生Z/E光异构和[2+2]-光环加成产物。因此，可以观察到光致相变。本研究显示了二氰二乙烯基液晶作为新型光反应材料的多功能性。
Multiresponsive luminescent materials with dicyanodistyrylbenzene chromophores incorporated into bent-core and rod-like molecules have been prepared and characterized. Rod-like compounds exhibit nematic or smectic liquid crystal phases, whereas bent-core compounds melt directly to the isotropic liquid at high temperatures. Fluorescence properties are very sensitive to external stimuli such as heat, light, pressure and solvent vapors. All compounds undergo Z/E photoisomerization in solution under UV irradiation. In addition, photochemical activity in bulk has been investigated. Whereas the crystal phases are stable under UV irradiation, the liquid crystal phases are unstable giving rise to Z/E photoisomerization and [2+2]-photocycloaddition products. As a consequence, photoinduced phase changes are observed. This study shows the versatilty of dicyanodistyrylbenzene-based liquid crystals as novel types of photoreactive materials.