Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2010-11-02

Journal: CHEMISTRY-A EUROPEAN JOURNAL

Included Journals: Scopus、PubMed、EI、SCIE

Volume: 16

Issue: 41

Page Number: 12349-12356

ISSN: 0947-6539

Key Words: affinity; environmental chemistry; fluorescent probes; palladium; rhodamine

Abstract: Because palladium is widely used in various catalysts and converters, which results in a high level of contamination of water systems and the soil by residual palladium, there is an urgent need for Pd2+-sensitive and -selective probes. Based on the special affinity of Pd2+ to conjugated double-bond ligands, two fluorescence probes (RPd2 and RPd3) that contain conjugated allylidene-hydrazone ligands that link to colorless rhodamine-spirolactam have been developed. The results show that conjugated allylidene-hydrazones have a much better affinity toward Pd2+, and consequently provide the probes with more acute color change and fluorescence enhancement (approximate to 170-fold), and better selectivity over other metal ions (especially platinum-group elements, or PGEs) than the unconjugated allyl-hydrazine. With richer electron density and a more suitable stereo effect in the allylidene-hydrazone group, RPd2 displays the best specificity toward Pd2+ and affords convenient detection by the naked eye. Its potential application for Pd2+-contaminated water and soil-sample analysis is revealed by proof-of-concept experiments.