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

Abstract

2,3-Dimethylquinoxaline-4-chlorobenzenesulphonate (DMQPCS) was synthesized successfully and grown as single crystals from 1:1 MeOH and water solvent mixture using slow evaporation method. Single crystal XRD analysis confirms that the molecular salt crystallizes in orthorhombic system with non-centrosymmetric space group, Pca21 and the crystal is stabilized by N+-H…O, O–H…O, N–H…O and C–H…O hydrogen bonding interactions. The presence of expected functional groups and the molecular structure were identified by FT-IR and NMR spectroscopic studies. Lower cut-off wavelength, % transmittance and optical band-gap value were determined by UV-Vis-NIR spectral analysis. The photoluminescence studies confirm green emission radiation. The thermal and mechanical behaviour were analyzed by TG-DTA analyses and Vickers microhardness tester, respectively. The SHG efficiency and laser damage threshold were measured using an Nd:YAG laser of wavelength 1064 nm. Variation of the dielectric response of the grown crystal was studied at different temperatures.