A Straight Green Fluorescent N,N‐Dimethylbenzamine ‐ Carbazole Probe for Recognition of Explosive Picric Acid
Denzil Britto Christopher Leslee, Shanmuga Bharathi Kuppannan, K. Sekar
Abstract
Abstract The sensor 4‐(9H‐carbazol‐9‐yl)‐N,N‐dimethylbenzenamine, CNDMA a green fluorescent ligand developed for selective sensing of picric acid in DMSO/H 2 O (1 : 9) over different other nitroaromatic compounds. The sensing mechanism involves emission quenching significantly in the presence of picric acid with a color change from green to non‐fluorescent yellow. The sensing process drives through electrostatic and Hydrogen bonding interaction with formation of an Electron Donor‐Acceptor complex. In addition, inner filter effect also play role on the fluorescence quenching. The fluorescence quenching is a mixed‐type of both static and dynamic quenching process. The binding nature was figured out using the 1 H NMR and FTIR titration studies. In addition the sensor showed good quenching efficiency and quenching constant with a lowest detection limit (LOD) of 5.09×10 −8 M (R=0.99964) at 358 nm. Test strip experiment is demonstrated to understand the practical feasibility of the sensor.