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A Medium‐Controlled Fluorescence Dual‐Responsive Probe for Cu 2+ and Hg 2+ in Aqueous Solutions
Author(s) -
Ma LiJun,
Chen Liping,
Chen Guirong,
Li HongWei,
Yang Liting,
Wu Yuqing,
Wang Dan,
Xie Jiewan
Publication year - 2012
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2012.01159.x
Subject(s) - fluorescence , chemistry , aqueous solution , solvent , methanol , histidine , ion , analytical chemistry (journal) , photochemistry , amino acid , chromatography , organic chemistry , quantum mechanics , biochemistry , physics
Abstract In this study, we report a histidine‐based fluorescence probe for Cu 2+ and Hg 2+ , in which the amino group and imino group were modified by two common protective groups, 9‐fluorenylmethoxycarbonyl and trityl group, respectively. In a water/methanol mixed solution, the probe displayed a selective fluorescence “turn‐off” response to Cu 2+ when the ratio of CH 3 OH/H 2 O was higher than 1:1. Specifically, when the solvent is changed to 1:1 methanol/water, the 304 nm fluorescence peak is enhanced, while the 317 nm peak is weakened, upon addition of either Cu 2+ or Hg 2+ ions. The mechanism for such distinct responses of the probe to Cu 2+ and Hg 2+ was further clarified by using NMR and molecular simulation. The experiment results indicated that the polarity of solvent could influence the coordination mode of 1 with Cu 2+ and Hg 2+ , and control the fluorescence response as a “turn‐off” or ratiometric probe.