Available online at www.scholarsresearchlibrary.com Scholars Research Library Archives of Physics Research, 2011, 2 (4):137-142 (http://scholarsresearchlibrary.com/archive.html) ISSN : 0976-0970 CODEN (USA): APRRC7 137 Scholars Research Library Synthesis, Growth and Characterization of a novel Organic crystal Glycine Potassium Iodide (GPI) P.S. Kannan a , A. Ramadoss b , G. Ganesh a , and A. SubbiahPandi c* a Department of Physics, S M K Fomra Institute of Technology, OMR, Thaiyur, Chennai, India b Department of Physics, Anand Institute of Higher Technology, Kalasalingam Nagar, OMR, Kazhipattur, Chennai, India c Department of Physics, Presidency College(autonomous), Chennai, India ______________________________________________________________________________ ABSTRACT Glycine Potassium Iodide (GPI) is a new organic crystal has been synthesized and single crystals have been grown from its aqueous solution by Slow Evaporation Solution Technique(SEST). The solubility of the material was measured at various temperatures in de- ionized water. Good quality of crystal of size 32x18x15 mm 3 has been harvested over a period of 48days. The grown crystals were characterized by Single crystal X-ray diffraction studies shows that GPI belongs to hexagonal system and identify the crystalline nature. The grown crystals have been subjected to powder X-ray diffraction to identify the intense peaks on various planes. The UV –VIS- NIR Spectrum of the grown GPI crystals shows less optical absorption and good transmittance in the entire visible region enabling its use in optical applications. Key Words: SEST, solubility, Single crystal X-ray diffraction, Powder X-ray diffraction and UV - VIS - NIR Spectroscopy. ______________________________________________________________________________ INTRODUCTION Organic materials attract much interest to chemists, material scientists and optical physics because of their superior performance with respect to NLO properties such as the large NLO efficient, ultrafast nonlinear response time, and high optical damage threshold [1-5]. Amino acids and their complexes belong to a family of organic materials that have been considered for photonic applications [6]. Out of 20 amino acids glycine is the simplest of all. Glycine family crystals have been subjected to extensive research by several researches for their efficient NLO properties [7-10]. In the present work, a systematic investigation has been carried out on Glycine Potassium Iodide (GPI) single crystal by slow evaporation solution growth technique. The grown crystal were