title: Determination of trace amount of Cu2+ with a multi-responsive colorimetric and reversible chemosensor.
abstract: A multi-responsive sensor 1 was constructed by combining a ferrocene unit and a rhodamine block via a carbohydrazone bond. The sensor showed high selectivity toward Cu(2+) over other common metal ions in a wide pH range with excellent reversibility and rapid response. The obvious color change from colorless to pink upon the addition of Cu(2+) could make it a suitable 'naked-eye' indicator for Cu(2+). The detection limit (LOD) obtained was down to 2.0 nM and the association constant (Ka) was evaluated as 4.65 × 10(7) M(-1). The accuracy for detecting Cu(2+) in environmental river water was compared favorably with the traditional atomic absorption spectroscopy method (AAS). Finally, we proposed a reversible ring-opening mechanism (Off-On) of the rhodamine spirolactam induced by Cu(2+) binding and a 2 : 1 stoichiometric structure between 1 and Cu(2+).
authors.affiliation: State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P.R. China.
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Mi
authors.forename: Zhong
authors.initials: Z
authors.lastname: Cao
authors.forename: Ya-Ting
authors.initials: YT
authors.lastname: Chen
authors.forename: Qiu-Fen
authors.initials: QF
authors.lastname: Xie
authors.forename: Ying-Ying
authors.initials: YY
authors.lastname: Xu
authors.forename: Yong-Feng
authors.initials: YF
authors.lastname: Luo
authors.forename: Jian-Jian
authors.initials: JJ
authors.lastname: Shi
authors.forename: Jian-Nan
authors.initials: JN
authors.lastname: Xiang
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D003124:Colorimetry; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D013050:Spectrometry, Fluorescence; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D003300:Copper