| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1165159 | Analytica Chimica Acta | 2012 | 5 Pages |
An efficient fluorescent chemosensor for Hg2+ ion, based on 5-(dimethylamino)-N-(2-mercaptophenyl)naphthalene-1-sulfonamide, has been developed. It exhibits Hg2+-selective on–off fluorescence quenching behavior via twisted intramolecular charge transfer (TICT) mechanism, which is rationalized by time dependent density functional theory (TD-DFT) calculations. The system exhibits visible color change from colorless to gray upon Hg2+ binding with very high selectivity and sensitivity (as low as 5.0 × 10−10 mol L−1) over other metal ions such as K+, Na+, Ag+, Mn2+, Ca2+, Ba2+, Fe2+, Zn2+, Pb2+, Cu2+, Sn2+, Cd2+, Ni2+ and Co2+. The present sensing system is also successfully applied for the detection of Hg2+ ion in real samples.
Graphical abstractA highly selective, simple, acyclic, dansyl based bipodal on–off fluorescence chemosensor for Hg2+ ion is reported. The system exhibits visible color change from colorless to gray upon Hg2+ binding via TICT mechanism. Hg2+-ion detection limit (as low as 5.0 × 10−10 mol L−1) is reported. This system can also be applied in real samples.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A highly selective, simple, acyclic, dansyl based bipodal on–off fluorescence chemosensor for Hg2+ ion is reported. ► The system exhibits visible color change from colorless to gray upon Hg2+ binding via TICT mechanism. ► Hg2+-ion detection limit (as low as 5.0 × 10−10 mol L−1) is reported. ► This system can also be applied in real samples.
