title: A benzo-15-crown-5-modifying ratiometric-absorption and fluorescent OFF-ON chemosensor for Cu(2.).
abstract: One new benzo-15-crown-5-modifying fluorene Schiff base (FBC), together with the CN-linked fluorene-3,4-dimethoxybenzene (FBDMO) and fluorene-benzene (FB) references, has been designed and facilely synthesized. The binding of Cu(2+) with nitrogen atom of CN moiety in these three compounds can inhibit the photo-induced electronic transition process and induce the ratiometric-absorption and fluorescent OFF-ON response to Cu(2+). Whereas the employment of benzo-15-crown-5 moiety in FBC as additional binding platform for Cu(2+) not only amplifies the fluorescent enhancement of FBCvia preventing the isomerization of CN moiety, but also endows this compound high selectivity and rapid response towards Cu(2+) over the references FB and FBDMO. These results render FBC highly sensitive ratiometric-absorption and fluorescent OFF-ON detecting potential for Cu(2+) with the detection limit of 3.91 × 10(-6) M.
authors.affiliation: Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, Department of Chemistry Dezhou University, Dezhou 253023, China. Electronic address: ch_yt@126.com.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, Department of Chemistry Dezhou University, Dezhou 253023, China.
authors.forename: Xinxin
authors.initials: X
authors.lastname: Wang
authors.affiliation: Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China. Electronic address: wangkaili@cee.cn.
authors.forename: Kaili
authors.initials: K
authors.lastname: Wang
authors.affiliation: Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, Department of Chemistry Dezhou University, Dezhou 253023, China.
authors.forename: Xiuling
authors.initials: X
authors.lastname: Zhang
keywords: Benzo-15-crown-5; Chemosensor; Fluorescence enhancement; Isomerization; Ratiometric-absorption