title: A new tridentate sulfur receptor as a highly sensitive and selective fluorescent sensor for Cu2+ ions.
abstract: 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 nM), 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.
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116025 (P. R. China).
authors.forename: Haiying
authors.initials: H
authors.lastname: She
authors.forename: Fengling
authors.initials: F
authors.lastname: Song
authors.forename: Juan
authors.initials: J
authors.lastname: Xu
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Xiong
authors.forename: Gengwen
authors.initials: G
authors.lastname: Chen
authors.forename: Jiangli
authors.initials: J
authors.lastname: Fan
authors.forename: Shiguo
authors.initials: S
authors.lastname: Sun
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Peng
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry; D003300:Copper / Q000032:analysis*; D005452:Fluoresceins / Q000138:chemical synthesis / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008968:Molecular Conformation; D009946:Organothiophosphorus Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010084:Oxidation-Reduction; D012235:Rhodamines / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013455:Sulfur / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D005452:Fluoresceins; D005456:Fluorescent Dyes; D007477:Ions; D009946:Organothiophosphorus Compounds; D012235:Rhodamines; D013455:Sulfur; D003300:Copper
keywords: copper; fluorescence; reduction; sensors; spiro compounds