Spectroscopic study, theoretical calculations, and optical nonlinear properties of amino acid (glycine)-4-nitro benzaldeyhyde-derived Schiff base

Abstract

Schiff base of amino acid salt: potassium 2-((4-nitrobenzylidene)amino)acetate 4 (C 9 H 7 KN 2 O 4 ), derived from the condensation reaction of amino acid (glycine) 1 and 4-nitro benzaldeyhyde 3 is synthesized and fully characterized by magnetic nuclear resonance ( 1 H and 13 C NMR), infrared (IR), mass, UV–visible spectroscopies and melting point. The optical nonlinear (ONL) properties of amino acid Schiff base salt 4 are studied using continuous wave (cw), visible, single transverse fundamental mode, low power, 473 nm laser beam. Ring diffraction patterns (RDPs) and Z-scan techniques are adopted to calculate the nonlinear index of refraction (NIR) together with testing the sample property of optical limiting (OLg). RDPs are simulated numerically using the integral of Fresnel-Kirchhoff and compared with experimental findings. • The Schiff base compound was synthesized and characterized by magnetic nuclear resonance ( 1 H and 13 C NMR). • We studied the nonlinear optical properties of Schiff base compound. • The nonlinear refractive index of this sample is determined using diffraction ring patterns and Z-scan techniques. . • Optical limiting threshold of Schiff base compound is found to be 9 mW.