Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5009568 | Sensors and Actuators B: Chemical | 2017 | 8 Pages |
â¢A new type of coumarin derivative has been designed and easily prepared.â¢The fluorescence sensor exhibits excellent sensitivity and selectivity for Pd2+.â¢The sensing process is based on the ICT fluorescence quenching mechanism.â¢The detection can also be performed in a visualized manner.
Based on the intramolecular charge transfer (ICT) fluorescence quenching mechanism, a ready-to-use colorimetric coumarin coordinative probe has been designed and successfully achieved for the efficient detection of Pd2+ in aqueous buffer media (pH 7.0), which promisingly meets real-world challenges through a facile synthetic route, fast response, by-eye visualization, regenerative-action, high selectivity and sensitivity. The UV-vis spectra, mass spectra and density function theory studies have indicated that a 1:1 complex is formed between the probe and Pd2+. The detection limit of Pd2+ is up to 2.9Â ÃÂ 10â7Â M. This reagent could even be used for estimation of Pd2+ in samples with its known concentrations with considerable accuracy (ca. 4.1-4.8% error). Moreover, the binding affinity and fluorescence quenching degree of 1 with Pd2+ are superior to those of 2. It has been demonstrated that the sensitive property of the chemosensors for Pd2+ is highly dependent on the fine structure of the conjugated compounds.
Graphical abstractBased on the ICT fluorescence quenching mechanism, a new type of coumarin derivative has been successfully achieved as an efficient colorimetric and fluorescent sensor for Pd2+ in aqueous solutions.Download high-res image (65KB)Download full-size image