The organic nonlinear optical (NLO) material 4-chloroanilinium 2-carboxy acetate (CACA) was grown by slow evaporation solution technique using ethanol as solvent. The crystallinity and crystal structure of the grown crystal were characterized by powder and single x-ray diffraction (XRD) studies. The CACA crystal was found to crystallize in monoclinic structure of centrosymmetric space group P21/C. The presence of functional groups of the grown crystal was confirmed by Fourier transform infrared spectroscopy (FTIR) analysis. Thermo gravimetric analysis (TG) and differential thermal analysis (DTA) were carried out to find the thermal stability of the CACA crystal. The optical absorption study was examined by UV-vis-NIR spectrum which indicates a wider optical transmission window for the grown crystal. The Second Harmonic Generation (SHG) was investigated to explore nonlinear optical characteristics of the grown material using by Kurtz and Perry powder technique.
