EPR of γ-irradiated single crystals of 2-amino-5-nitro pyridinium l-tartrate: A NLO material

Single crystals of a non-linear optical (NLO) material 2-amino-5-nitropyridinum l-tartrate (ANPLT) were grown by solvent evaporation technique and characterized by the measurement of density, FT-IR, FT-Raman and X-ray diffraction techniques. Microhardness study and SHG test were also carried out. The EPR spectra were recorded for γ-irradiated single crystal of ANPLT. The angular variation studies of the spectra were carried out and the principal values of g- and A-tensors were determined. The site symmetry of the radical formed is axial.