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极性有机晶体在不同的溶剂中具有明显不同的生长习性,主要有两个方面的原因:一是极性有机晶体属非中心对称性晶类,晶体具有极轴,极轴的存在对分子堆积和晶体生长具有重要影响;另一是极性有机晶体的界面结构不同,溶剂与晶体界面的相互作用不同,使得晶体同一面族的生长速率不同,从而导致了晶体习性的改变.本文从几种典型极性有机晶体的分子排列和结构特征出发,着重探讨了极性有机晶体的界面结构的差异对晶体习性的影响;结合晶体生长界面与溶剂分子的相互作用进一步理解了晶体生长的溶剂效应;通过理解极性有机晶体的习性机制,探讨了晶体实际形态的控制.
Polar organic crystals have different growth habit in different solvents, there are two main reasons: First, the polar organic crystals are non-centrosymmetric crystal, the crystal has a polar axis, the presence of polar axis on the molecular accumulation And the crystal growth has an important impact; the other is the polar organic crystal interface structure is different, the interaction between the solvent and the crystal interface is different, making the crystal growth rate of the same surface group is different, resulting in changes in the habit of crystal.In this paper, Based on the molecular arrangement and structural characteristics of typical polar organic crystals, the effect of the difference of interface structure of polar organic crystals on the habit of crystals was discussed. The solvent effect of crystal growth was further understood by the interaction of crystal growth interface and solvent molecules. By understanding the habit mechanism of polar organic crystals, the control of the actual morphology of the crystal was discussed.