title: Structures and magnetism of two novel heptanuclear lanthanide-centered trigonal prismatic clusters: [LnCu6(mu 3-OH)3(HL)2(L)4](ClO4)2.25H2O (Ln = La, Tb; H2L = iminodiacetic acid).
abstract: The new heteronuclear iminodiacetic acid (H2L) complexes [LnCu6(mu 3-OH)3(HL)2(L)4](ClO4)(2).25H2O with Ln = La (1) and Tb (2) have been prepared in aqueous solution and characterized by single-crystal X-ray diffraction to be isomorphous (crystallographic data for 1 and 2: hexagonal, P63/m; a = b = 12.6425(14) A, c = 24.541(5) A, Z = 2 (1); a = b = 12.5802(9) A, c = 24.285(4) A, Z = 2 (2)). Ln3+ was found to be located in the center of the trigonal prismatic cage formed by six Cu2+ ions, with a tricapped trigonal prismatic coordination environment of nine O atoms. The magnetic properties of complexes 1 and 2 have been studied. The results indicate the presence of ferromagnetic couplings between Tb3+ and Cu2+ in compound 2.
authors.affiliation: State Key Laboratory of Rare Earth Materials Chemistry and Applications & PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Q D
authors.initials: QD
authors.lastname: Liu
authors.forename: S
authors.initials: S
authors.lastname: Gao
authors.forename: J R
authors.initials: JR
authors.lastname: Li
authors.forename: Q Z
authors.initials: QZ
authors.lastname: Zhou
authors.forename: K B
authors.initials: KB
authors.lastname: Yu
authors.forename: B Q
authors.initials: BQ
authors.lastname: Ma
authors.forename: S W
authors.initials: SW
authors.lastname: Zhang
authors.forename: X X
authors.initials: XX
authors.lastname: Zhang
authors.forename: T Z
authors.initials: TZ
authors.lastname: Jin