Abstract

A new heptanuclear compound [{Co(TPA)CN}6Fe][PF6]8 (1) (TPA=tris(2-pyridylmethyl)amine) was constructed by the reaction of [Co(TPA)]2+ cations and K3Fe(CN)6. The cyanometalate core is capped by six mono-nuclear cobalt units via the cyanides. 1 crystallizes in triclinic space group C2 with a=19.5720Å, b=26.2450Å, c=16.3820Å, β=118.500° and Z=2. Variable temperature magnetic measurements have demonstrated that very weak antiferromagnetic interaction between the nearest paramagnetic CoII centers is exhibited. Thus weak antiferromagnetic coupling might be transferred by NCFeCN bridging units.

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