Studies on Electro Chemical Activity and Third Order Non Linear Optical Properties of Novel (E)-4-Chloro-2-((Phenylimino)Methyl)Phenol, (4C2PMP) Covalent Molecular Coloured Single Crystal : A Potential Organic Crystalline Material for Optical and Electro Chemical Biosensor Applications

In this research, we developed and characterized a novel Schiff base compound, 4-Chloro-2-((Phenylimino)methyl)phenol, (4C2PMP) , focusing on its nonlinear optical and electrochemical properties. Crystals were synthesized using the slow evaporation technique. We employed both powder X-ray diffraction and single- crystal X-ray diffraction to verify the crystal structures. Our optical characterization revealed a lower cut-off wavelength of 563 nm in UV-Visible spectroscopy. The compound exhibited second harmonic generation with emission at 532 nm, while photoluminescence measurements showed a violet shift with a peak at 384 nm and a band gap of 3.21 eV. Laser damage threshold measurements yielded an energy value of 75 mJ, with the crystal demonstrating a power density of 3.98 GW/cm2, exceeding the performance of standard reference materials. Infrared spectroscopy confirmed the successful formation of the schiff base ligand, particularly highlighting the-NH2 nitrogen and-OH oxygen atom bonds. Through Z-scan analysis, we determined the third order non linear optical parameters: nonlinear refractive index (n2) of 3.84x10-8 cm2/W, absorption coefficient (beta) of 2.11x10-4 cm/W, and third-order susceptibility (chi 3) of 4.07x10-6 esu. Electrochemical characterization through impedance spectroscopy revealed reaction kinetics, while cyclic voltametry provided insights into electron transfer mechanisms and redox properties critical for biological signal transduction.