Design of liquid crystals with 'de Vries-like' properties: structural variants of carbosilane-terminated 5-phenylpyrimidine mesogens.
Design of liquid crystals with 'de Vries-like' properties: structural variants of carbosilane-terminated 5-phenylpyrimidine mesogens.
复制标题
具有“德弗里斯样”特性的液晶设计：碳硅烷封端的 5-苯基嘧啶介晶的结构变体。
作者：
C. Schubert;Carsten Müller;A. Bogner;F. Giesselmann;R. Lemieux
合成了两个具有支化异三碳硅烷端基的介孔分子5-[4-(12，12，14，14，16，16-hexamethyl-12，14，16-trisilaheptadecyloxy)phenyl]-2-hexyloxypyrimidine(QL16-6)的结构变体，并用偏光显微镜、差示扫描量热法、小角和二维X射线散射技术表征了它们的介晶性和类De Vries性质。对具有线状和支化三碳硅烷端基的异构体的比较分析表明，它们表现出类似的介晶性和类似德弗里斯的性质。此外，由二维X射线散射实验得出的SMA和SMC相中线形和支链异构体之间的有效分子长度的差异(约4-5ä)表明，线形三碳硅烷端基在时间平均上是半球形的，正如在B3LYP/6-31G*水平上的DFT构象分析所预测的那样。
Structural variants of the 'de Vries-like' mesogen 5-[4-(12,12,14,14,16,16-hexamethyl-12,14,16-trisilaheptadecyloxy)phenyl]-2-hexyloxypyrimidine (QL16-6), including two isomers with branched iso-tricarbosilane end-groups, were synthesized and their mesomorphic and 'de Vries-like' properties were characterized by polarized optical microscopy, differential scanning calorimetry, small angle and 2D X-ray scattering techniques. A comparative analysis of isomers with linear and branched tricarbosilane end-groups shows that they exhibit comparable mesomorphic and 'de Vries-like' properties. Furthermore, the difference in effective molecular length Leff between the linear and branched isomers in the SmA and SmC phases (ca. 4-5 Å), which was derived from 2D X-ray scattering experiments, suggests that the linear tricarbosilane end-group is hemispherical in shape on the time-average, as predicted by a DFT conformational analysis at the B3LYP/6-31G* level.
具有类似“de Vries”特性的液晶设计：适合无 V 形 FLC 配方的碳硅烷封端 5-苯基嘧啶介晶
影响因子：
6.4
作者：
C. P. J. Schubert;A. Bogner;J. H. Porada;K. Ayub;T. Andrea;F. Giesselmann;R. P. Lemieux
通讯作者：
R. P. Lemieux