Development and visualization of level II, III features of latent fingerprints using some new 4-(4-substitutedphenyl)-6-(4-substitutedphenyl)-2-oxo-1, 2-dihydropyridine-3-carbonitrile derivatives: Synthesis, characterization, optoelectronic and DFT studies

Organic dye compounds with luminescent properties are in demand to use in visualizing the latent fingerprints (LFPs) at crime spot investigation. Here, we synthesized some new 4-(4-substitutedphenyl)-6-(4-substitutedphenyl)-2-oxo-1,2-dihydropyridine-3-carbonitrile 4(a-d) and were confirmed using spectroscopic approaches. Optical properties were recorded in solvent media, where peaks were absorbed in similar to 300-400 nm of longer wavelength and emitted at similar to 467-574 nm in the blue region. Dual redox peak current was observed in Cyclic voltammetry at different scan rate and estimated redox onset potential, and energy molecules have been experimentally calculated. DFT studies have been carried out using Gaussian 09 software at the gaseous phase. From the results of theoretical investigations, compounds 4(a-d) showed higher photostability, chemical reactivity and good reactive sites. Also, synthesized compounds were used to determine the latent fingerprints with the help of powder dusting method. Level II and III features of LFPs are observed on porous/non-porous surfaces without optical hindrance and images were taken in normal and 365 nm UV light. From the above results, the synthesized compounds are efficient materials for forensic science applications.

Automated summary

The study synthesized a new class of luminescent organic dye compounds for visualizing latent fingerprints, and confirmed their optical properties, cyclic voltammetry, and molecular energy calculations. The synthesized compounds were found to be efficient for forensic science applications.