K. Boopathi

Crystal growth, structural, optical, thermal and dielectric studies of non-linear optical 2-amino-5-nitropyridinium nitrate (2A5NPN) single crystals

Abstract Single crystals of 2-amino-5-nitropyridinium nitrate (2A5NPN), semiorganic non-linear optical crystals have been grown by conventional slow evaporation solution technique using water as solvent. Optically good quality crystal having dimension up to 10 × 10 × 10 mm3 was grown. The single-crystal X-ray diffraction (XRD) studies confirm that 2A5NPN crystallises in monoclinic crystal system with the space group P21/n and the morphology of the grown crystal was identified. The powder XRD pattern of the grown crystal was recorded. Fourier transform infrared (FTIR) measurement was carried out to identify the various functional groups present in the compound. The optical property of the grown crystal was analysed using UV–Visible Near Infrared analysis. The thermal stability of the compound was ascertained using thermogravimetric and differential scanning calorimetric analysis. The etch pit density of the grown crystal was calculated by chemical etching analysis using dimethyl sulphoxide as an etchant. The frequency and temperature dependent dielectric constant and dielectric loss of the grown crystal was analysed. The photoluminescence analysis was carried out.

Growth and optical characterizations on 3-aminophenol perchlorate (3-AMPP) crystal

A single crystal of organic nonlinear optical material 3-aminophenol perchlorate (3-AMP) was successfully grown by the slow evaporation solution method. Single-crystal X-ray diffractrometer was utilized to measure unit cell parameters and to confirm lattice parameter. 3-aminophenol perchlorate belongs to monoclinic space group P21. The optical transparency window in the UV-vis-NIR region is found to be good for nonlinear optical applications second harmonic studies were carried out. The second harmonic output intensity was tested using the Kurtz and Perry powder method and was found to be 1.1 times that of potassium dihydrogen phosphate (KDP).