Synthesis, structural, thermal and mechanical properties of 1,10-phenanthrolinium-3-carboxy-4-hydroxy benzene sulphonate crystal: An efficient SHG material with a high laser damage threshold for NLO applications

Abstract

Nonlinear optical material, 1,10-phenanthrolinium-3-carboxy-4-hydroxy benzene sulphonate (PCHBS) has been synthesized and single crystals grown by slow solvent evaporation solution growth technique in methanol as the solvent. The 1H and 13C NMR spectra were recorded to establish the molecular structure. The single crystal XRD analysis reveals that the title salt crystallizes in monoclinic crystal system with non-centrosymmetric space group, P21. The presence of various functional groups was confirmed by FT-IR spectroscopic studies. The UV–vis-NIR was recorded in the range 200–1200nm to find the optical transmittance window, lower cut off wavelength and optical band gap. The thermal and mechanical properties were estimated by TG/DTA analysis and Vickers microhardness study, respectively. The SHG efficiency of title crystal was measured by employing modified Kurtz and Perry powder technique. Further, the laser damage threshold value has been determined using a Q-switched Nd:YAG laser operating at 1064nm.