1-((4-methylpiperazin-1-yl)(phenyl)methyl)naphthalen-2-ol: A novel Mannich base organic NLO crystal for the analysis of electro-optic applications

Organic 2-naphthol derived 1-((4-methylpiperazin-1-yl)(phenyl)methyl)naphthalen-2-ol Mannich base non linear optical single crystal was synthesized and crystallized successfully to investigate the suitability of the material for electro-optic device applications. Acetonitrile was used as a solvent to develop optically good quality single crystal. Slow evaporation technique was employed at room temperature. Single crystal X-ray diffraction confirms the existence of non-centrosymmetric nature of the grown crystal. The nonlinear optical property was tested by Kurtz and Perry powder technique and the SHG efficiency of MPN was found to be 1.03 times than standard KDP. The PL spectrum of MPN shows blue light emission which confirms the material as potential candidate for the opto-electronic applications. The load dependent hardness was measured by Vickers’ microhardness test and various parameters such as yield strength, stiffness constant were calculated and reported. The dielectric constant and dielectric loss were measured as a function of frequency for different temperatures. The low dielectric constant and dielectric loss confirms the lesser defects and quality of the grown crystal. A fraction amount of activation energy obtained from ac conductivity measurement is an added advantage for electro-optic device fabrication. The dark current of MPN that leads the photo current shows the negative photo conducting nature of the material which may be due to the reduction of charge carriers.