A novel organic non-linear optical material 4-chloro -N- methyl 4-stilbazolium tosylate, a new derivative of the stilbazolium tosylate family has been synthesized and good optical quality single crystals of size 10 mm x 6 mm x 2 mm were grown by slow evaporation technique. The grown crystals were subjected to different instrumentation methods for characterization. The diffraction planes were identified and indexed by powder X-ray diffraction analysis. The crystal system and lattice parameters were found from single crystal X-ray diffraction. Fourier transform infrared was recorded to confirm the functional groups. In order to study the optical quality of the grown crystal, the UV-VIS spectrum was recorded in the solution state and cut off wavelength was determined. Vickers Microhardness test was carried out and Meyer’s index ‘n’ was calculated. Being nonlinear optical material, second harmonic efficiency was determined in comparison with urea.
