Synthesis, characterizations of new Schiff base heterocyclic derivatives and their optoelectronic, computational studies with level II & III features of LFPs

Organic Schiff base compounds with luminous characteristics are receiving attention and increasing demand for the imaging of latent fingerprints (LFPs) at crime scenes. Sb1 and Sb2 novel Schiff base heterocyclic compounds were synthesized and confirmed by using analytical and spectroscopic methods. The existence of both donating and accepting groups influenced the appearance of absorption bands at longer wavelength and was recorded using UV-absorption and emission spectrum in solvent media. Compounds Sbl and Sb2 emit at 576 nm and 646 nm in bathochromic shift respectively. The electrochemical properties were investigated using cyclic voltammetry. Quantum chemical parameters with vibrational frequency have been estimated in density functional theory (DFT), using TD-DFT/CAM (B3LYP) approach employing 6-311++ G (d, p) basis set in the ground state. Theoretical vibrational frequency values were specifically agreed to obtained experimental values. Furthermore, FMOs, MEPs, RDG analyses and Mulliken atomic charges have been calculated. In addition, LFPs images were developed by powder dusting approach on specified materials using synthetic compounds and visualized under Visible and UV light. The level II and III properties of LFPs on the substrate were observed under light-medium with no background interference, therefore these compounds are potential materials for electroluminescent, OLEDs and forensic science applications. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

Organic Schiff base compounds with luminous characteristics have attracted attention and increased demand for latent fingerprint imaging at crime scenes. Two novel Schiff base heterocyclic compounds, Sb1 and Sb2, were synthesized and confirmed using analytical and spectroscopic methods. The compounds exhibited absorption bands at longer wavelengths and emitted light at specific wavelengths. Their electrochemical properties and theoretical calculations were investigated, and the compounds showed potential applications in electroluminescent, OLED, and forensic science fields.