Chalconas como material de partida para pirazóis e compósitos fluorescentes: reveladores de impressões digitais latentes

Abstract

Fingerprints are known as an important matrix for human identification in forensic science. Over the years, the technology in developing and evaluating latent fingerprints has been improving. In view of this, fluorescent chalcones were prepared by means of Claisen Schmitd condensation. These compounds were mixed separately with rice husk lignin and silicon dioxide; zinc oxide. A series of pyrazoles derived from chalcones and thiosemicarbazide were also prepared in microwaves. The products were characterized by Infrared Spectroscopy; Gas Chromatography coupled with Mass Spectrometry; Nuclear Magnetic Resonance Spectroscopy; Energy Dispersive X-ray Fluorescence Spectroscopy; Scanning Electron Microscopy. The prepared materials were tested on fingerprints deposited on different surfaces showing all papillary ridge details demonstrating identifiable fingerprints. Thiocarbamoylpyrazole 2c and the composites 5c/SiO2/ZnO and 5c/lignin were the compounds that obtained the image quality being promising compounds for fingerprint development. The obtaining of these composites provides important tools that can be used in forensic sciences.