6533b7d9fe1ef96bd126c04e

RESEARCH PRODUCT

Cyano-Bridged Bimetallic Assemblies from Hexacyanometalate, [M(CN)6]3- (M = MnIII and FeIII), and [M(N4-macrocycle)]2+ (M = FeIII, NiII and ZnII) Building Blocks. Syntheses, Multidimensional Structures, and Magnetic Properties

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Reactions between [M(N4-macrocycle)]2+ (M = ZnII and NiII; macrocycle ligands are either CTH = d,l-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane or cyclam = 1,4, 8, 11-tetrazaazaciclotetradecane) and [M(CN)6]3- (M = FeIII and MnIII) give rise to cyano-bridged assemblies with 1D linear chain and 2D honeycomblike structures. The magnetic measurements on the 1D linear chain complex [Fe(cyclam)][Fe(CN)6]·6H2O 1 points out its metamagnetic behavior, where the ferromagnetic interaction operates within the chain and the antiferromagnetic one between chains. The Neel temperature, TN, is 5.5 K and the critical field at 2 K is 1 T. The unexpected ferromagnetic intrachain interaction can be rationalized on the basis of the axially elongated octahedral geometry of the low spin FeIII ion of the [Fe(cyclam)]3+ unit. The isostructural substitution of [Fe(CN)6]3- by [Mn(CN)6]3- in the previously reported complex [Ni(cyclam)]3[Fe(CN)6]2·12H2O 2 leads to [Ni(cyclam)]3[Mn(CN)6]2·16 H2O 3, which exhibits a corr...