Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-01-25

Journal: CHEMICAL RESEARCH IN CHINESE UNIVERSITIES

Included Journals: CSCD、ISTIC、SCIE、Scopus

Volume: 27

Issue: 1

Page Number: 127-131

ISSN: 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.