title: Dodecanuclear manganese(III) phosphonates with cage structures.
abstract: Treatments of Mn(O(2)CR)(2) (R = Me, Ph) with NBu(4)MnO(4) in CH(3)CN or CH(3)CN/CH(2)Cl(2) in the presence of acetic acid, delta(1)-cyclohexenephosphonic acid (C(6)H(9)PO(3)H(2)), and 2,2'-bipyridine or 1,10-phenanthroline result in three novel dodecamanganese(III) clusters [Mn(12)O(8)(O(2)CMe)(6)(O(3)PC(6)H(9))(7)(bipy)(3)] (1), [Mn(12)O(8)(O(2)CPh)(6)(O(3)PC(6)H(9))(7)(bipy)(3)] (2), and [Mn(12)O(8)(O(2)CPh)(6)(O(3)PC(6)H(9))(7)(phen)(3)] (3). They have a similar Mn(12) core of [Mn(III)(12)(mu(4)-O)(3)(mu(3)-O)(5)(mu-O(3)P)(3)] with a new type of topologic structure. Solid-state dc magnetic susceptibility measurements of complexes 1-3 reveal that dominant antiferromagnetic interactions are propagated between the magnetic centers. The ac magnetic measurements suggest an S = 2 ground state for compounds 1 and 3 and an S = 3 ground state for compound 2.
authors.affiliation: State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, Nanjing University, PR China.
authors.forename: Hong-Chang
authors.initials: HC
authors.lastname: Yao
authors.forename: Yi-Zhi
authors.initials: YZ
authors.lastname: Li
authors.forename: You
authors.initials: Y
authors.lastname: Song
authors.forename: Yun-Sheng
authors.initials: YS
authors.lastname: Ma
authors.forename: Li-Min
authors.initials: LM
authors.lastname: Zheng
authors.forename: Xin-Quan
authors.initials: XQ
authors.lastname: Xin