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Liquid crystalline amides: Linear arrangement of rod-like molecules by lateral intermolecular hydrogen bonding and molecular shape effect
Kajitani, Takashi,Kohmoto, Shigeo,Yamamoto, Makoto,Kishikawa, Keiki
, p. 3449 - 3456 (2004)
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 C x, 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.
