Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2012-09-01

Journal: CHEMISTRY-A EUROPEAN JOURNAL

Included Journals: Scopus、PubMed、EI、SCIE

Volume: 18

Issue: 39

Page Number: 12242-12250

ISSN: 0947-6539

Key Words: fluorescent probes; lactams; palladium; sensors; spiro compounds

Abstract: The well-known rhodamine spiro-lactam framework offers an ideal model for the development of fluorescence-enhanced chemosensors through simple and convenient syntheses. Herein, we report a new tridentate PNO receptor, which was introduced into a rhodamine spiro-lactam system to develop Pd2+-chemosensor RPd4, that displayed significantly improved sensing properties for palladium. Compound RPd4 shows a very fast response time (about 5 s), high sensitivity (5 nM), and excellent specificity for Pd2+ ions over other PGE ions (Pt2+, Rh3+, and Ru3+). In addition, RPd4 displays quite different responses to different valence states of the Pd ions, that is, very fast response towards Pd2+ ions but slow response towards Pd0, which may provide us with a convenient method for the selective discrimination of Pd species in different valence states. According to proof-of-concept experiments, RPd4 has potential applications in Pd2+-analysis in drug compounds, water, soil, and leaf samples. Owing to its good reversibility, RPd4 can also be used as a sensor material for the selective detection and visual recovery of trace Pd2+ ions in environmental samples.