Liquid crystalline amides: linear arrangement of rod-like molecules by lateral intermolecular hydrogen bonding and molecular shape effect
作者:Takashi Kajitani、Shigeo Kohmoto、Makoto Yamamoto、Keiki Kishikawa
DOI:10.1039/b408672d
日期:——
Bent- and straight-rod shaped liquid crystalline amides 1–3 were designed and synthesized, and their thermodynamic behaviors were investigated by polarized optical microscopy and differential scanning calorimetry, and their layer distances were measured by X-ray diffraction. Weak or strong hydrogen bonds were observed in variable-temperature FT-IR spectra for bent-rod shaped compounds 1 possessing a long alkoxy chain (OR2), straight-rod shaped compounds 2, and straight-rod shaped 3 in their smectic C, smectic Cx, and smectic A phases, respectively. Thus, these liquid crystalline amides could generate linear molecular aggregates in their smectic layers by the lateral intermolecular hydrogen bonds.
设计并合成了弯棒状和直棒状液晶酰胺1-3,通过偏光光学显微镜和差示扫描量热法研究了它们的热力学行为,并通过X射线衍射测量了它们的层距。在具有长烷氧基链 (OR2) 的弯棒状化合物 1、直棒状化合物 2 和直棒状化合物 3 的近晶 C、近晶相中,在变温 FT-IR 光谱中观察到弱或强氢键分别为 Cx 相和近晶 A 相。因此,这些液晶酰胺可以通过横向分子间氢键在其近晶层中生成线性分子聚集体。