Work

Hybrid dansyl-triazine based mono and bidentate ligands for the selective sensing of fluoride anion through fluorescence enhancement

Year: 2025

Type: article

Abstract: H NMR, LC-MS, IR, UV-vis absorption and emission and corroborated with theoretical methods. Studies showed that the bidendate ligand (DTD) exhibits intra-molecular charge transfer (ICT) from the donor dansyl fluorophore (HOMO) to the triazine acceptor (LUMO). On the other hand, electron density of the HOMO and LUMO of the mono ligand is localised on the dansyl group. Interestingly, these ligands showed selective detection of fluoride anions with a limit of detection (LOD) of 1.31 μM and 294 nM for the DTM and DTD ligands respectively. The electrostatic potential surface mapping suggests that the hydrogen bonding between NH of the ligand and fluoride ion as the underlying mechanism for sensing. Time-correlated single photon counting (TCSPC) analyses further validate this rationale, where DTM showed a lifetime of 3.56 ns and DTD 1.65 ns. Upon binding, the lifetime increases, this may be attributed to the restricted molecular rotation upon hydrogen bonding.

Source: RSC Advances

DOI: 10.1039/d5ra01092f

Authors: Ajay Jayaprakash, Rakhi Mol K. M., Mintu Porel

Institution: Indian Institute of Technology Palakkad

Language: English

Topic: Molecular Sensors and Ion Detection

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,042

Funder: Indian Institute of Technology Palakkad