Jiang S, Zhou H, Tian Y
Key Laboratory for Supramolecular Structure and Spectroscopy, Jilin University, 130023 Changchun.
Guang Pu Xue Yu Guang Pu Fen Xi. 2000 Dec;20(6):758-60.
Hydrogen bonding is one of the principal intermolecular forces to enable the construction of supramolecular structures. By choosing an appropriate proton acceptor and a proton donor, stable intermolecular hydrogen bonds can form and affect or change the phase behavior of the donor and acceptor. We have obtained two intermolecular hydrogen bonded liquid crystals using the stilbazoles as the proton acceptor. In this paper we will research the molecular structure and the arrangement changes during the phase transition process of the stilbazoles by temperature variable FTIR spectroscopy. The results show that the number of the gauche conformation is increasing as the temperature increasing. When it is coming to the isotropic phase, the alkyl chain is in disorder. The frequency shift of carbonyl stretching bands has been found to be sensitive to the change of molecular conformation, inter and intramolecular interactions.
氢键是促使超分子结构形成的主要分子间作用力之一。通过选择合适的质子受体和质子供体，能够形成稳定的分子间氢键，并影响或改变供体和受体的相行为。我们以均二苯乙烯唑作为质子受体，得到了两种分子间氢键型液晶。在本文中，我们将通过变温傅里叶变换红外光谱研究均二苯乙烯唑在相变过程中的分子结构及排列变化。结果表明，随着温度升高，gauche构象的数量增加。当进入各向同性相时，烷基链处于无序状态。已发现羰基伸缩带的频移对分子构象、分子间和分子内相互作用的变化敏感。
