Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-11-01

Journal: CHEMISTRY-AN ASIAN JOURNAL

Included Journals: Scopus、PubMed、EI、SCIE

Volume: 8

Issue: 11

Page Number: 2762-2767

ISSN: 1861-4728

Key Words: copper; fluorescence; reduction; sensors; spiro compounds

Abstract: The introduction of Lawessons reagent into a bis-rhodamine spirolactam system afforded a new fluorescent sensor for Cu2+ ions, SRR, which contained a new tridentate sulfur ligand. SRR showed excellent specificity for Cu2+ ions over other cations (including Cu+, Hg2+, and Fe3+), very high sensitivity (10nM), and a rapid response time (3min). The detection mechanism was investigated by (HNMR)-H-1, (CNMR)-C-13, (PNMR)-P-31, and ESR spectroscopy, MS, and Gaussian calculations. Coordination of a Cu2+ ion to the tridentate sulfur ligand, which promotes ring-opening of the rhodamine groups, followed by a spontaneous reduction reaction (Cu2+ into Cu+), has been proposed as the sensing mechanism.