Structural, linear and nonlinear optical, electrical and NBO reports on 4-aminopyridine-1-ium 4-aminobenzoate single crystal for SHG, optoelectronics and violet laser emission applications

Good quality NLO single crystal 4-aminopyridine-1-ium 4-aminobenzoate (4AP4AB) were grown by slow evaporation method. The Single crystal XRD analysis shows that the 4AP4AB compound belongs to the monoclinic system with non-centrosymmetric group C. Further, the molecular structure and vibrational assignments of the grown crystal were analysed by NMR and Fourier transform infrared (FT-IR) analysis. NBO analysis analysed inter and intramolecular interactions. Optical and thermal stabilities have been characterized by UV–Visible and DSC analysis. Linear optical parameters of the 4AP4AB crystal were quantified and listed by UV–visible study. Vicker's microhardness test at room temperature shows that the hardness number increases with increasing the load. The laser damage threshold (LDT) energy has been measured using an Nd:YAG laser. The impedance analysis recorded the dielectric response of the grown 4AP4AB crystal. The appearance of semicircle in Cole–Cole plot represents the dielectric relaxation and resistivity of the 4AP4AB crystal. Solid-state parameters of 4AP4AB were quantified and listed for the theoretical approaches.