A second order nonlinear optical material 1-ethyl-2, 6-dimethyl-4 hydroxy pyridinium zinc sulphate (EDMPZS) was designed and synthesized. The molecular structure was confirmed by FTIR and NMR techniques. Thermal stability was recorded by TG/DTA and DSC. The lower cutoff wavelength (263 nm) and a wide optical transmittance window covering the UV-Visible region were determined by UV-Vis spectra. Single crystals (10 x 2 x 2 mm3) were grown by solvent evaporation technique at 298 K. Dielectric measurements were carried out using a LCR meter and the electrical parameters viz, dielectric constant (ε’) and loss (ε”), real (Z’) and imaginary (Z”) part of impedance, relaxation time (τ) were evaluated. The powder second harmonic generation (SHG) efficiency was found to be 6.2 times that of KDP and the phase matching property was established.
