With the use of Kläui's tripodal ligand, [(Cp)Co(P(O)(OEt)2)3]− (LCoEt, Cp = cyclopentadiene) as the auxiliary ligand to react with different metal salts and tricyanometalate building blocks, five neutral trimetallic hexanuclear complexes: [(Tp)2Fe2(CN)6Cu2(LCoEt)2]·6H2O (1, Tp = hydridotris(pyrazolyl)borate), [(Tp*)2Fe2(CN)6Cu2(LCoEt)2]·2H2O (2, Tp* = hydridotris(3,5-dimethyl-pyrazolyl)borate), [(pzTp)2Fe2(CN)6Cu2(LCoEt)2]·H2O·3MeOH (3, pzTp = tetra(pyrazolyl)borate), [(Tp)2Fe2(CN)6Ni2(LCoEt)2(MeCN)2]·2MeCN·2H2O (4) and [(Tp)2Fe2(CN)6Mn2(LCoEt)2(MeCN)2]·2MeCN (5), have been obtained and structurally characterized. Magnetic measurements confirm that there are ferromagnetic couplings between the cyano-bridged Fe and Cu/or Ni ions and antiferromagnetic interaction between the cyano-bridged Fe and Mn ions. Slow relaxation of the magnetization is observed in complexes 1 and 4, while complex 3 exhibits metamagnetic behavior with a critical field of 17.5 kOe.
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