title: Optical Cu2+ probe bearing an 8-hydroxyquinoline subunit: high sensitivity and large fluorescence enhancement.
abstract: A new fluorescent and colorimetric probe RCu1 with ultra-sensitivity (detection limit is 4.7 nM (3σ)) was developed. It is based on a rhodamine B derivative modified with a functionalized 8-hydroxyquinoline group as a copper-binding site which greatly increases the affinity for Cu(2+). Cu(2+) acts not only as a selective recognizing guest but also a hydrolytic promoter. RCu1 showed single-selectively sensing Cu(2+) over other cations and much larger fluorescence enhancement (as high as over 1000-fold) than those based on Cu(2+)-complexation. The detection mechanism was proved by TOF-MS, FT-IR, (1)H NMR and Gaussian calculations. Based on the outstanding recognition ability of RCu1 toward Cu(2+), an analytical procedure was developed for Cu(2+)-determination in natural water samples and soil sample.
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, No. 2 Linggong Road, High-tech District, Dalian 116024, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Zhu
authors.forename: Jiangli
authors.initials: J
authors.lastname: Fan
authors.forename: Jing
authors.initials: J
authors.lastname: Lu
authors.forename: Mingming
authors.initials: M
authors.lastname: Hu
authors.forename: Jianfang
authors.initials: J
authors.lastname: Cao
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Honglin
authors.initials: H
authors.lastname: Li
authors.forename: Xiaojian
authors.initials: X
authors.lastname: Liu
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Peng
mesh_terms: D003124:Colorimetry; D003300:Copper / Q000032:analysis / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006912:Hydroxyquinolines / Q000138:chemical synthesis / Q000737:chemistry*; D057230:Limit of Detection; D008958:Models, Molecular; D008968:Molecular Conformation; D055620:Optical Phenomena; D015125:Oxyquinoline / Q000138:chemical synthesis / Q000737:chemistry*; D012235:Rhodamines / Q000138:chemical synthesis / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D005456:Fluorescent Dyes; D006912:Hydroxyquinolines; D012235:Rhodamines; D015125:Oxyquinoline; D003300:Copper