Synthesis, structural, photoluminescence, thermal, mechanical, dielectric, nonlinear optical and laser damage threshold studies of 2,3-dimethylquinoxalinium-4-chlorobenzenesulphonate

•An organic DMQPCS crystal was grown by the slow evaporation method.•The title crystal system is orthorhombic with space group of Pna21.•SHG efficiency of crystal is 1.42 times that of KDP crystal.•Laser damage threshold energy is found to be 1.24 GW/cm2.•The grown crystal belongs to soft material category.