Structural, thermal and spectroscopic investigation of nonlinear optical crystal L-arginine hydrobromide monohydrate

L-Arginine hydrobromide monohydrate (LAHBr) has been found to be a new semiorganic material for nonlinear optical devices. In this communication, synthesis, material purification, and single crystal growth, followed by structural, optical, thermal characterization of LAHBr by X-ray diffraction, infrared spectroscopy, differential thermal analysis, and thermogravimetric analysis, are demonstrated. The infrared absorption bands indicate the mode of vibrations of different molecular groups present in LAHBr and confirm the protonation of the amino group. Thermogravimetric analysis and differential thermal analysis results ruled out the possibility of structural changes independent of mass changes. (C) 1998 Elsevier Science Ltd.