Journal
CRYSTAL GROWTH & DESIGN
Volume 8, Issue 10, Pages 3646-3651Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cg800239g
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The crystallization of DL-alanine from water/alcohol supersaturated solutions results in the precipitation of a racemic compound displaying a needlelike hollow morphology, in contrast to the needlelike crystals grown from pure aqueous solutions. This unusual morphology is explained by assuming that the supersaturated solutions crystallized rapidly to create DL-alanine nanocrystals that assemble to give mesoscale crystals. The resulting DL-alanine crystals are characterized by a range of techniques such as X-ray diffraction, scanning electron microscopy, micro-Raman, and differential scanning calorimetry. The kinetics was studied by light scattering and ion-solution conductivity. These measurements revealed that these superstructures Of DL-alanine mesocrystals consist of three-dimensional DL-alanine nanocrystals. Finally, a mechanism for the formation Of DL-alanine mesocrystals with a hollow morphology is proposed.
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