title: Contrasting magnetism of [Mn(III)(4)] and [Mn(II)(2)Mn(III)(2)] squares.
abstract: Two tetranuclear manganese distorted square-shaped clusters, [Mn(III)(4)(L1)(4)(mu(2)-OMe)(4)].2.5H(2)O (1) and [Mn(II)(2)Mn(III)(2)(L2)(4)(H(2)O)(2)](PF(6))(2).CHCl(3).CH(3)OH.1.5H(2)O (2) (H(2)L1 = 2-[3-(2-hydroxyphenyl)-1H-pyrazol-5-yl]-6-pyridinecarboxylic acid methyl ester; H(2)L2 = 2-[3-(2-hydroxyphenyl)-1H-pyrazol-5-yl]-6-pyridinecarboxylic acid ethyl ester), exhibit antiferromagnetic and ferromagnetic interactions between neighboring manganese ions, respectively.
authors.affiliation: Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8571, Japan.
authors.forename: Takuto
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Takuya
authors.initials: T
authors.lastname: Shiga
authors.forename: Mao
authors.initials: M
authors.lastname: Noguchi
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Onuki
authors.forename: Graham N
authors.initials: GN
authors.lastname: Newton
authors.forename: Norihisa
authors.initials: N
authors.lastname: Hoshino
authors.forename: Motohiro
authors.initials: M
authors.lastname: Nakano
authors.forename: Hiroki
authors.initials: H
authors.lastname: Oshio