title: Self-assembly of five 8-hydroxyquinolinate-based complexes: tunable core, supramolecular structure, and photoluminescence properties.
abstract: Five new Zn(II) complexes, namely [Zn(3)(L)(6)] (1), [Zn(2)(Cl)(2)(L)(2) (py)(2)] (2), [Zn(2)(Br)(2) (L)(2)(py)(2)] (3), [Zn(L)(2)(py)] (4), and [Zn(2)(OAc)(2)(L)(2)(py)(2)] (5), were prepared by the solvothermal reaction of ZnX(2) (X(-) =Cl(-), Br(-), F(-), and OAc(-)) salts with a 8-hydroxyquinolinate ligand (HL) that contained a trifluorophenyl group. All of the complexes were characterized by elemental analysis, IR spectroscopy, and powder and single-crystal X-ray crystallography. The building blocks exhibited unprecedented structural diversification and their self-assembly afforded one mononuclear, three binuclear, and one trinuclear Zn(II) structures in response to different anions and solvent systems. Complexes 1-5 featured four types of supramolecular network controlled by non-covalent interactions, such as π⋅⋅⋅π-stacking, C-H⋅⋅⋅π, hydrogen-bonding, and halogen-related interactions. Investigation of their photoluminescence properties exhibited disparate emission wavelengths, lifetimes, and quantum yields in the solid state.
authors.affiliation: School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002 (P. R. China), Fax: (+86) 555-2311552; State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter Institution, Chinese Academy of Sciences, Fuzhou, Fujian 350002 (P. R. China). yuanguozan@163.com.
authors.forename: Guozan
authors.initials: G
authors.lastname: Yuan
authors.forename: Weilong
authors.initials: W
authors.lastname: Shan
authors.forename: Xuelong
authors.initials: X
authors.lastname: Qiao
authors.forename: Li
authors.initials: L
authors.lastname: Ma
authors.forename: Yanping
authors.initials: Y
authors.lastname: Huo
keywords: 8-hydroxyquinolinates; photoluminescence; self-assembly; supramolecular chemistry; zinc