Effects of chain branching and lateral fluorine substitution on mesomorphism of cholesteryl benzoates
Effects of chain branching and lateral fluorine substitution on mesomorphism of cholesteryl benzoates
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DOI：
10.1080/02678292.2014.882422
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发表时间：
2014-03
期刊：
影响因子：
2.2
通讯作者：
M. Varia;H. T. Srinivasa;Sandeep Kumar
中科院分区：
文献类型：
--
作者：
M. Varia;H. T. Srinivasa;Sandeep Kumar
本文报道了具有侧位邻位/Meta取代的电负性氟原子的端部正链/支链/饱和/不饱和烷基链的胆甾醇4′-烷氧基苯基-4-羧酸酯。所有同系物均表现出各向异性介晶性。在不同的同系物中观察到近晶A相、手性异构体、蓝相（BP）和TGBA相。所有新化合物均通过光谱和元素分析进行了表征。通过DSC、POM和X-射线衍射分析对所有化合物进行了热分析和中间相表征。讨论了各种末端正链/支链/饱和/不饱和烷基链和取代氟原子的位置对其结构相关化合物的影响。
The mesogenic cholesteryl 4′-alkoxyphenyl-4-carboxylates possessing terminal normal/branched/saturated/unsaturated alkyl chains with laterally ortho/meta substituted electronegative fluorine atom are described. All the homologues exhibited enantiotropic mesomorphism. Smectic A phase, chiral nematic, blue phase (BP) and TGBA phases were observed in different homologues. All the novel compounds were characterised by spectroscopic and elemental analysis. Thermal investigations and mesophase characterisations for all the compounds were carried out by the combination of DSC, POM and X-ray analysis. The effects of the various terminal normal/branched/saturated/unsaturated alkyl chains and the position of the substituted fluorine atom with its structurally related compounds have been discussed.