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论文类型： 期刊论文

发表时间： 2010-11-02

发表刊物： CHEMISTRY-A EUROPEAN JOURNAL

收录刊物： SCIE、EI、PubMed、Scopus

卷号： 16

期号： 41

页面范围： 12349-12356

ISSN号： 0947-6539

关键字： affinity; environmental chemistry; fluorescent probes; palladium; rhodamine

摘要： 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.