title: A new luminescent lanthanide supramolecular network possessing free Lewis base sites for highly selective and sensitive Cu(2+) sensing.
abstract: A series of new lanthanide complexes, formulated as [Ln2(DCSAL)3(H2O)11]·3DCSAL·4H2O [Ln = Eu (1), Gd (2) and Tb (3); DCSAL = 3,5-dichlorosalicylate], have been synthesized and characterized by single crystal X-ray analysis. They are dinuclear clusters and form a 3D supramolecular network viaπ-π stacking and halogen bonding interactions. 3 exhibits strong Tb characteristic emission, whose quantum yield is as high as 38%. Due to binding with Cu(2+) ions via its Lewis acid-base interactions, 3 displayed a high selectivity and sensitivity for Cu(2+) detection based on Tb(3+) emission quenching. The possible quenching mechanism was further proved to be a static quenching mechanism by Stern-Volmer plots and UV-vis spectrum. More importantly, the binding constant between 3 and Cu(2+) is also calculated by the Benesi-Hildebrand method, which is helpful for quantitative analysis.
authors.affiliation: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen, University, Guangzhou, 510275, P. R. China. cesyyy@mail.sysu.edu.cn.
authors.forename: Tianshu
authors.initials: T
authors.lastname: Chu
authors.forename: Yunsong
authors.initials: Y
authors.lastname: Hu
authors.forename: Jinlun
authors.initials: J
authors.lastname: Wu
authors.forename: Chenghui
authors.initials: C
authors.lastname: Zeng
authors.forename: Yangyi
authors.initials: Y
authors.lastname: Yang
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng
mesh_terms: D002413:Cations, Divalent / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D006219:Halogens / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000138:chemical synthesis / Q000737:chemistry*; D049449:Luminescence; D015394:Molecular Structure; D055668:Photochemical Processes; D013057:Spectrum Analysis; D014961:X-Ray Diffraction
chemical_list: D002413:Cations, Divalent; D006219:Halogens; D028581:Lanthanoid Series Elements; D003300:Copper