Abstract
Crystal structure and thermal stability of the hydrated crystals of the basic amino acid L-arginine named as L-arginine dihydrate (LAD), a nonlinear optical material have been reported here. The title compound crystallized in the space group P212121 with Z=4 and unit cell dimensions a=11.856(2)Å, b=15.694(2)Å, c=5.664(3)Å. The arginine molecule is a zwitterion with the guanidyl group accepting an extra proton from the carboxylate group. DTA-TG analysis gives an idea about the thermal behaviour of LAD and ruled out the possibility of structural changes independent of mass changes. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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