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Indexed by:期刊论文

Date of Publication:2012-05-15

Journal:TALANTA

Included Journals:SCIE、EI、PubMed

Volume:93

Page Number:55-61

ISSN No.:0039-9140

Key Words:Optical probe; Cu2+; High sensitivity; 8-Hydroxyquinoline; Environmental samples

Abstract:A new fluorescent and calorimetric probe RCu1 with ultra-sensitivity (detection limit is 4.7 nM (3 sigma)) was developed. It is based on a rhodamine B derivative modified with a functionalized 8-hydroxyquinoline group as a copper-binding site which greatly increases the affinity for Cu2+center dot Cu2+ acts not only as a selective recognizing guest but also a hydrolytic promoter. RCu1 showed single-selectively sensing Cu2+ over other cations and much larger fluorescence enhancement (as high as over 1000-fold) than those based on Cu2+-complexation. The detection mechanism was proved by TOF-MS, FT-IR, H-1 NMR and Gaussian calculations. Based on the outstanding recognition ability of RCu1 toward Cu2+, an analytical procedure was developed for Cu2+-determination in natural water samples and soil sample. (C) 2012 Elsevier B.V. All rights reserved.