title: Tetramanganese(II) cluster with centered trigonal topology: structure and magnetic properties.
abstract: A new tetranuclear manganese(II) compound, [Mn4L6](ClO4)2 (L is the Schiff base derived from 2-pyridylaldehyde and 2-aminophenolate), has been synthesized and characterized structurally and magnetically. The compound is the first example of tetramanganese clusters with centered planar trigonal topology in which a central Mn(II) ion is connected with three peripheral Mn(II) ions by double phenoxo bridges, generating a trigonal Mn[(mu-phenoxo)2Mn]3 core. Magnetic studies have demonstrated a very weak ferromagnetic interaction between the central and peripheral Mn(II) ions, which leads to a high-spin ground state (S = 10). The ferromagnetic interaction has been tentatively related to distortion of the metal coordination environments after comparing the magnetic and structural data of the known Mn(II) complexes with similar bridging moieties.
authors.affiliation: State Key Lab of Rare Earth Materials Chemistry and Applications & PKU-HKU Joint Lab in Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, China.
authors.forename: En-Qing
authors.initials: EQ
authors.lastname: Gao
authors.forename: Shi-Qiang
authors.initials: SQ
authors.lastname: Bai
authors.forename: Zheng
authors.initials: Z
authors.lastname: He
authors.forename: Chun-Hua
authors.initials: CH
authors.lastname: Yan