title: Luminescent ultrathin film of anionic styrylbiphenyl derivative-layered double hydroxide and its reversible sensing for heavy metal ions.
abstract: Ordered ultrathin films (UTFs) with blue luminescence based on a styrylbiphenyl derivative (BTBS) and Mg-Al-layered double hydroxide (LDH) nanosheets have been constructed employing the layer-by-layer assembly technique. UV-visible absorption and fluorescence spectroscopy showed a stepwise and regular growth of the films upon increasing the number of deposition cycles. XRD, AFM and SEM indicated that the films possess a periodic layered structure with a period of ca. 1.5 nm, and uniform surface morphology. The film thickness can be precisely controlled in the range ca. 15-53 nm. The BTBS-LDH UTFs exhibit improved UV-light resistance capability compared with the pristine BTBS and show well-defined polarized photoemission, with anisotropy of ca. 0.24. The UTFs show a fast, selective and reversible luminescent response to aqueous solutions containing different heavy metal ions, with the most significant luminescent quenching occurring for the Hg(2+) solution, shedding light on the fact that these films can serve as a new type of selective solid luminescent metal-ion sensor.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China. lujun@mail.buct.edu.cn weimin@mail.buct.edu.cn.
authors.forename: Dongpeng
authors.initials: D
authors.lastname: Yan
authors.forename: Jun
authors.initials: J
authors.lastname: Lu
authors.forename: Min
authors.initials: M
authors.lastname: Wei
authors.forename: Shuangde
authors.initials: S
authors.lastname: Li
authors.forename: David G
authors.initials: DG
authors.lastname: Evans
authors.forename: Xue
authors.initials: X
authors.lastname: Duan
mesh_terms: D000535:Aluminum / Q000737:chemistry; D001713:Biphenyl Compounds / Q000737:chemistry*; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D006878:Hydroxides / Q000737:chemistry*; D008274:Magnesium / Q000737:chemistry; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry
chemical_list: D001713:Biphenyl Compounds; D006878:Hydroxides; D019216:Metals, Heavy; D014867:Water; C031356:hydroxide ion; D000535:Aluminum; D008274:Magnesium