title: Cyano-bridged hexanuclear Fe4M2 (M = Ni, Co, Mn) clusters: spin-canted antiferromagnetic ordering of Fe4Ni2 cluster.
abstract: Heterobimetallic hexanuclear cyano-bridged complexes, [{Fe(Tp)(CN)3}4{M(MeCN)(H2O)2}(2)].10H2O.2MeCN [M = Ni (1), Co (2), Mn (3); Tp = hydrotris(1-pyrazolyl)borate], have been synthesized in H2O-MeCN solution. Complexes 1-3 are isostructural and hexanuclear with [{Fe(Tp)(CN)3}4{M(MeCN)(H2O)2}2] units linked by hydrogen bonds to form a 2D-structure in the solid state. Complex 1 is a canted antiferromagnet that undergoes a field-induced spin-flop-like transition at approximately 1 T and 2 K. At 4.45 K 1 has a transition to paramagnetic state of noninteracting S = 4 magnetic clusters. However, 2 and 3 show antiferromagnetic intracluster coupling. Facile loss of solvent from 2 alters the local symmetry resulting in changing the intracluster interaction from antiferro- to ferromagnetic.
authors.affiliation: Department of Chemistry, Kongju National University, Chungnam, Korea. jkim@kongju.ac.kr
authors.forename: Jinkwon
authors.initials: J
authors.lastname: Kim
authors.forename: Sujin
authors.initials: S
authors.lastname: Han
authors.forename: Konstantin I
authors.initials: KI
authors.lastname: Pokhodnya
authors.forename: Jesse M
authors.initials: JM
authors.lastname: Migliori
authors.forename: Joel S
authors.initials: JS
authors.lastname: Miller