Structural and thermal characterization of L-arginine dihydrate - a nonlinear optical material by Tapati Mallik, Tanusree Kar, Gabriele Bocelli, and Amos Musatti

Crystal Research and Technology

Cryst. Res. Technol. 41, 280 (2006) - Abstract -

Structural and thermal characterization of L-arginine dihydrate - a nonlinear optical material

Tapati Mallik, Tanusree Kar, Gabriele Bocelli*, and Amos Musatti*

Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
*IMEM- CNR,Parco Area delle Scienze 37a,I-43010 Fontanini Parma, Italy

Keywords	optical materials, crystal growth, thermogravimetric analysis, X-ray diffraction, crystal structure
PACS	42.70.Mp, 61.66.Hq, 81.70.Pg, 61.10.Nz
DOI	10.1002/crat.200510574

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.

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