INFRARED-SPECTROSCOPY AND THERMAL STUDIES OF AS-GROWN L-ARGININE PHOSPHATE MONOHYDRATE CRYSTALS

Single crystals of L-arginine phosphate monohydrate (LAP) (C6H14N4O2 . H3PO4 . H2O) were successfully grown from aqueous solution of L-argin ine and phosphoric acid at an ambient temperature of 28.5 degrees C fo r different pH values ranging from 2.1 to 5.04. As-grown single crysta ls were characterized by chemical analysis, density measurement and X- ray powder diffraction studies. Infrared (IR) spectroscopy, thermo-gra vimetric (TG) and differential thermal analyses (DTA) measurements wer e performed to study the molecular vibration and thermal behaviour of LAP crystals.