Abstract

The structure and thermal properties of mesomorphic phenyl benzoate CH₃–C(O)–C₆H₄–OC(O)–C₆H₄–OC₉H₁₉ (I) were studied by differential scanning calorimetry (DSC) and X-ray diffraction. The crystal packing of I is typical of mesomorphic crystals. It consists of alternating loosely packed aliphatic and closely packed aromatic regions, the latter regions being stabilized by weak directional C–H···π interactions. According to the DSC data, compound I does not form a mesophase upon melting. The latter was observed only upon cooling of the isotropic melt. The lack of enantiotropic mesomorphism in the crystal of I is attributed to the fact that C–H···π non-covalent interactions, which could ensure the structuring of the melt, are broken at the melting point.

中文翻译：

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介晶型4-酰基苯基4'-壬氧基苯甲酸酯CH 3 C（O）C 6 H 4 –OC（O）–C 6 H 4 –OC 9 H 19的X射线衍射和热成像研究

摘要

用差示扫描量热法（DSC）和X射线研究了亚型苯甲酸苯酯CH ₃ –C（O）–C ₆ H ₄ –OC（O）–C ₆ H ₄ –OC ₉ H ₁₉（I）的结构和热性能。射线衍射。I的晶体堆积是介晶晶体的典型特征。它由松散填充的脂族区域和紧密填充的芳族区域组成，后者区域通过弱的C–H···π方向相互作用而稳定。根据DSC数据，化合物I在熔化时不形成中间相。仅在各向同性熔体冷却时才观察到后者。I晶体中缺乏对映体的同构性是由于这样的事实，即CHH·· π非共价相互作用可以确保熔体的结构，在熔点处被破坏。