title: A novel chemosensor based on rhodamine derivative for colorimetric and fluorometric detection of Cu2+ in aqueous solution.
abstract: A new rhodamine-based reversible chemosensor (2) was synthesized, which exhibits high sensitivity and selectivity for Cu(2+) but no significant response toward other competitive metal ions in aqueous solution. Upon the addition of Cu(2+), the spirolactam ring of 2 was opened and the solution color changed from colorless to red. Strangely, an unexpected fluorescence quenching was observed, which is contrary to the fluorescence turn-on of the most rhodamine-based chemosensors. The likely novel sensing mechanism has been proposed.
authors.affiliation: School of Chemical and Material Engineering, Jiangnan University, Wuxi, People's Republic of China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.forename: Hai-qiang
authors.initials: HQ
authors.lastname: Wu
authors.forename: Jian-hua
authors.initials: JH
authors.lastname: Sun
authors.forename: Xiao-ya
authors.initials: XY
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Luo
authors.forename: Ming-qing
authors.initials: MQ
authors.lastname: Chen
mesh_terms: D003124:Colorimetry; D003300:Copper / Q000032:analysis*; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D005470:Fluorometry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D012235:Rhodamines / Q000138:chemical synthesis / Q000737:chemistry*; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry
chemical_list: D005456:Fluorescent Dyes; D012235:Rhodamines; D012996:Solutions; D014867:Water; D003300:Copper