title: Highly sensitive and fast-responsive fluorescent chemosensor for palladium: reversible sensing and visible recovery.
abstract: The well-known rhodamine spiro-lactam framework offers an ideal model for the development of fluorescence-enhanced chemosensors through simple and convenient syntheses. Herein, we report a new tridentate PNO receptor, which was introduced into a rhodamine spiro-lactam system to develop Pd(2+)-chemosensor RPd4, that displayed significantly improved sensing properties for palladium. Compound RPd4 shows a very fast response time (about 5 s), high sensitivity (5 nM), and excellent specificity for Pd(2+) ions over other PGE ions (Pt(2+), Rh(3+), and Ru(3+)). In addition, RPd4 displays quite different responses to different valence states of the Pd ions, that is, very fast response towards Pd(2+) ions but slow response towards Pd(0), which may provide us with a convenient method for the selective discrimination of Pd species in different valence states. According to proof-of-concept experiments, RPd4 has potential applications in Pd(2+)-analysis in drug compounds, water, soil, and leaf samples. Owing to its good reversibility, RPd4 can also be used as a sensor material for the selective detection and visual recovery of trace Pd(2+) ions in environmental samples.
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, No. 2 Linggong Road, High-tech District, Dalian 116024, P. R. China.
authors.forename: Honglin
authors.initials: H
authors.lastname: Li
authors.forename: Jiangli
authors.initials: J
authors.lastname: Fan
authors.forename: Mingming
authors.initials: M
authors.lastname: Hu
authors.forename: Guanghui
authors.initials: G
authors.lastname: Cheng
authors.forename: Danhong
authors.initials: D
authors.lastname: Zhou
authors.forename: Tong
authors.initials: T
authors.lastname: Wu
authors.forename: Fengling
authors.initials: F
authors.lastname: Song
authors.forename: Shiguo
authors.initials: S
authors.lastname: Sun
authors.forename: Chunying
authors.initials: C
authors.lastname: Duan
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Peng