Homo- and heterodinuclear 2,2′-bipyrimidine-bridged complexes
Tóm tắt
[M′(hfacac)2(bpym)] complexes, where M′ = CoII, NiII or ZnII, hfacac = hexafluoroacetylacetonate and bpym = 2,2′bipyrimidine; and [Cl2M(μbpym)M′(hfacac)2] complexes, where M = CoII, NiII MnII or ZnII M′ = NiII; M = NiII or ZnII and M′ = ZnII; M = NiII and M′ = CoII have been prepared and characterized by chemical analysis, conductance measurements, IR and electronic spectroscopies and magnetic susceptibility measurements (4.2–292 K range). The dinuclear NiII–NiII, CoII–NiII and MnII–NiII complexes are antiferromagnetic, with an intramolecular exchange parameter, J, of −2.3–8.9 cm−1. CoII and MnII are in a high spin state. The low temperature effect observed in monomers and in NiII–ZnII dimers is considered a consequence of either an intermolecular antiferromagnetic interaction or the zero-field splitting in NiII.
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