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 communica tion, synthesis, material purification, and single crystal growth, fol lowed by structural, optical, thermal characterization of LAHBr by X-r ay diffraction, infrared spectroscopy, differential thermal analysis, and thermogravimetric analysis, are demonstrated. The infrared absorpt ion bands indicate the mode of vibrations of different molecular group s present in LAHBr and confirm the protonation of the amino group. The rmogravimetric analysis and differential thermal analysis results rule d out the possibility of structural changes independent of mass change s. (C) 1998 Elsevier Science Ltd.