A semiorganic crystal of 2- amino-5-nitropyridinium sulfamate was grown from slow evaporation method. Bulk crystals of 2-amino-5-nitropyridinium sulfamate (2A5NPS) was grown using assembled temperature reduction (ATR) apparatus. The as grown crystal was irradiated using Au³⁺ metallic ion. Morphology of pristine and irradiated crystal was studied. Surface of irradiated crystals were damaged heavily and it decreased the degree of crystallinity. Nonlinear optical properties of as grown pristine and irradiated were determined using Kurtz powder technique. A nonlinear optical property of irradiated crystal has decreased. The decrease of second harmonic generation (SHG) is due to higher ion fluence, which almost affected the noncentro symmetric packing of the molecular crystal. Complex impedance was studied using Princeton Applied Research (2 channels) with frequency range 1Hz to 1MHz and the bulk resistance and grain boundary resistance were calculated.