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This work studied the self-assembling (crystallizing) behaviour of amino acids in the absence of solvent and additives (by sublimation and deposition in vacuum), instead of from aqueous solution. It is found that the hydrophilicity/hydrophobicity of side-chains can significantly affect the crystallization of amino acids in the absence of solvent. Crystal structures of amino acids having hydrophobic...
It is found that β glycine, the metastable polymorph of glycine, can be rapidly formed from gas phase via the sublimation of its stable α or γ form in vacuum. The transformation process was monitored by infrared spectroscopy and the crystal structure of the sublimate was identified by X-ray diffraction techniques. It is the first report about the transformation of stable α or γ glycine into metastable...
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