2-Amino-4-Picolinium-Nitrophenolate-Nitrophenol—An Efficient Organic Material for Frequency Conversion Applications

Organic nonlinear optical (NLO) material, 2-amino-4-picolinium-nitrophenolate-nitrophenol (2A4PNN), was synthesized and bulk single crystals were grown by slow evaporation solution growth technique (SEST) using ethanol as a solvent. The 2A4PNN crystallizes in orthorhombic crystal system with the non-centrosymmetric space group of Pna2₁. The thermal properties (such as thermal stability, decomposition and specific heat capacity) of 2A4PNN were investigated by using thermogravimetric/differential thermal analysis (TG-DTA), differential scanning calorimetric (DSC) and modulated differential scanning calorimetric (MDSC) analysis respectively. Pulsed Nd:YAG laser (1064 nm) were used to investigate the laser damage threshold of 2A4PNN single crystal of (100) crystallographic plane. The photoconductivity and micro-hardness studies were also performed for (100) crystallographic plane of 2A4PNN single crystal.