摘要
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.
Growth habits of polar organic crystals are mainly determined by: (1) the internal structures of the crystals; and (2) the interactions of solvent molecules with the growth interfaces, particularly with two polar faces. Since polar organic crystals have noncentric structures, the existence of polar axis (axes) in the crystals has a significant effect on the molecular arrangement and on the crystal growth. On the other hand, different interface structures of two polar faces have different interaction with solvent molecules, solvent absorption on these faces are different. Therefore, the relative growth rates of these faces are different and thus lead to the habit modification. Based on these points, the molecular packing, interface structure and interface - solvent interactions of several polar organic crystals with a structure A- C6H4 - D such as 4 - amino - 4' - nitrodiphenyl sulfide (ANDS), o - dicyanovinyl anisole (DIVA) , N - 4 - nitrophenyl - (L) - prolinol (NPP) and 4 - nitro - 4' - methyl - benzilidine aniline (NMBA) have been investigated from the standpoint of crystal chemistry and structural perspectives. It is possible that growth habits of polar organic crystals can be controlled based on the interface - solvent interactions by choosing a suitable solvent or tailor - made additive.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1998年第4期320-327,共8页
Acta Chimica Sinica
基金
国家攀登计划
山东大学晶体材料国家重点实验室的部分资助
关键词
极性有机晶体
有机晶体
晶体
NMBA
习性
生长
polar organic crystals
molecular packing
interface structure
molecular interaction
habit modifications.
