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A New Tridentate Sulfur Receptor as a Highly Sensitive and Selective Fluorescent Sensor for Cu 2+ Ions
Author(s) -
She Haiying,
Song Fengling,
Xu Juan,
Xiong Xiaoqing,
Chen Gengwen,
Fan Jiangli,
Sun Shiguo,
Peng Xiaojun
Publication year - 2013
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201300534
Subject(s) - chemistry , reagent , sulfur , fluorescence , ligand (biochemistry) , ion , rhodamine , proton nmr , rhodamine b , metal ions in aqueous solution , inorganic chemistry , photochemistry , stereochemistry , organic chemistry , catalysis , receptor , biochemistry , physics , quantum mechanics , photocatalysis
The introduction of Lawesson′s reagent into a bis‐rhodamine spirolactam system afforded a new fluorescent sensor for Cu 2+ ions, SRR , which contained a new tridentate sulfur ligand. SRR showed excellent specificity for Cu 2+ ions over other cations (including Cu + , Hg 2+ , and Fe 3+ ), very high sensitivity (10 n M ), and a rapid response time (3 min). The detection mechanism was investigated by 1 H NMR, 13 C NMR, 31 P NMR, and ESR spectroscopy, MS, and Gaussian calculations. Coordination of a Cu 2+ ion to the tridentate sulfur ligand, which promotes ring‐opening of the rhodamine groups, followed by a spontaneous reduction reaction (Cu 2+ into Cu + ), has been proposed as the sensing mechanism.
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