title: Seven phenoxido-bridged complexes encapsulated by 8-hydroxyquinoline Schiff base derivatives and β-diketone ligands: single-molecule magnet, magnetic refrigeration and luminescence properties.
abstract: Seven dinuclear complexes based on 8-hydroxyquinoline Schiff base derivatives and β-diketone ligands, [RE2(hfac)4L2] (RE = Y (1), Gd (2), Tb (3), Dy (4), Ho (5), Er (6) and Lu (7); hfac(-) = hexafluoroacetylacetonate; HL = 2-[(4-chloro-phenylimino)-methyl]-8-hydroxyquinoline), have been synthesized, and structurally and magnetically characterized. Complexes 1-7 have similar dinuclear structures, in which each RE(III) ion is eight coordinated by two L(-) and two hfac(-) ligands in a distorted dodecahedron geometry. The luminescence spectra indicate that complex 3 exhibits characteristic Tb(III) ion luminescence, while 1 and 7 show HL ligand luminescence. The magnetic studies reveal that 2 features a magnetocaloric effect with the magnetic entropy change of -ΔSm = 16.83 J kg(-1) K(-1) at 2 K for ΔH = 8 T, and 4 displays slow magnetic relaxation behavior with the anisotropic barrier of 6.7 K and pre-exponential factor τ0 = 5.3 × 10(-6) s.
authors.affiliation: Department of Chemistry, Tianjin University, Tianjin 300072, P. R. China. cuijianzhong@tju.edu.cn ghl@tju.edu.cn.
authors.forename: Shi-Yu
authors.initials: SY
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Tianjin University, Tianjin 300072, P. R. China. cuijianzhong@tju.edu.cn ghl@tju.edu.cn.
authors.forename: Wen-Min
authors.initials: WM
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Tianjin University, Tianjin 300072, P. R. China. cuijianzhong@tju.edu.cn ghl@tju.edu.cn.
authors.forename: Hong-Xia
authors.initials: HX
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Tianjin University, Tianjin 300072, P. R. China. cuijianzhong@tju.edu.cn ghl@tju.edu.cn.
authors.forename: Hai-Yun
authors.initials: HY
authors.lastname: Shen
authors.affiliation: Department of Chemistry, Tianjin University, Tianjin 300072, P. R. China. cuijianzhong@tju.edu.cn ghl@tju.edu.cn.
authors.forename: Li
authors.initials: L
authors.lastname: Jiang
authors.affiliation: Department of Chemistry, Tianjin University, Tianjin 300072, P. R. China. cuijianzhong@tju.edu.cn ghl@tju.edu.cn.
authors.forename: Jian-Zhong
authors.initials: JZ
authors.lastname: Cui
authors.affiliation: Department of Chemistry, Tianjin University, Tianjin 300072, P. R. China. cuijianzhong@tju.edu.cn ghl@tju.edu.cn.
authors.forename: Hong-Ling
authors.initials: HL
authors.lastname: Gao