title: Syntheses, structures and magnetic properties of a family of heterometallic [Mn(II)2Mn(III)2Ln(III)2] clusters.
abstract: A new family of isostructural Mn-Ln heterometallic clusters, [Mn(II)(2)Mn(III)(2)Ln(III)(2)(Piv)(8)(thme)(2)(H(2)tea)(2)] (H(3)thme = 1,1,1-tris(hydroxymethyl)ethane, Hpiv = pivalic acid, H(3)tea = triethanolamine, and Ln = Pr, Nd, Sm, Eu, Gd, Tb, and Dy) have been prepared by reaction of the hexanuclear manganese precursor, [Mn(6)O(2)(Piv)(10)(4-Me-Py)(2.5)(Hpiv)(1.5)], with H(3)thme, H(3)tea, and Ln(NO(3))(3)·6H(2)O under the solvothermal conditions. Complexes 1Pr-7Dy were characterized by single-crystal X-ray diffraction and their core [Mn(2)(III)Mn(2)(II)Ln(2)(III)(μ(3)-OR)(4)(μ(2)-OR)(6)](6+) composed of four face-sharing defected cubane units. Antiferromagnetic (AF) exchange interactions were suggested for all of the complexes by solid-state dc magnetic susceptibility measurements. Complexes 6Tb and 7Dy, show frequency-dependent ac susceptibility signals suggestive of slow magnetic relaxation.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
authors.forename: Jinying
authors.initials: J
authors.lastname: Liu
authors.forename: Chengbing
authors.initials: C
authors.lastname: Ma
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.forename: Mingqiang
authors.initials: M
authors.lastname: Hu
authors.forename: Huimin
authors.initials: H
authors.lastname: Wen
authors.forename: Honghua
authors.initials: H
authors.lastname: Cui
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Song
authors.forename: Changneng
authors.initials: C
authors.lastname: Chen