Disorder and twinning in molecular crystals: impurity-induced effects in adipic acid.

摘要: The variation in physical properties of crystals grown the presence additives or impurities have previously been attributed to lattice disorder developed during crystallization. Adipic acid crystallized a variety stereochemically related typifies such behavior with manifest variations dissolution rates and enthalpies solution fusion. In this case most extreme habit, produced by added monoalkanoic acids, is rounded dumbbell that was suggested be twinned crystal. contribution are fully characterized both through their external morphology means single crystal X-ray diffraction. These techniques show these particles not but rather disordered comprising small number slightly misaligned domains. interaction between additive substrate modeled new selected induce formation true mechanical twins adipic acid.