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.

Keywords:

• Crystal growth
• X-ray diffraction
• chemical etching
• thermal property
• photoluminescence

Acknowledgements

The authors thank Dr. S. Brahadeeswaran and Mr. K. Tirupugalmani, Department of Physics, BIT Campus, Anna University, Tiruchirappalli for their support in Optical Microscope facility.