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Indexed by:期刊论文

Date of Publication:2011-01-25

Journal:CHEMICAL RESEARCH IN CHINESE UNIVERSITIES

Included Journals:Scopus、SCIE、ISTIC、CSCD

Volume:27

Issue:1

Page Number:127-131

ISSN No.:1005-9040

Key Words:Terpyridine; Fluorescence sensor; Ratiometric fluoroionophoric behavior; Time-correlated single photon counting

Abstract:A sensitive and selective zinc ion ratiometric fluorescence sensor has been synthesized and characterized. This material displays dual fluorescence. After the material was bonded to a closed-shell metal ion, such as Zn2+, the recovery of the local excited fluorescence of the material-Zn2+ complex, largely at the expense of the intramolecular charge transfer fluorescence, is consistent with the difference between selected orbital transitions of the free dye and the metal-chelated complex. For instance, the contribution of the pi(tpy)->pi(tpy), transition becomes more prominent. This is also consistent with the results of the fluorescence decay behavior, measured via a time-correlated single photon counting setup. In contrast, the corresponding open shell Ni2+-bound complex quenches both kinds of photoluminescence, due to spin-orbit coupling.