Abstract
Abstract For the purpose of construction of the hydrogen-bonded and coordination-bonded supramolecular network, MnII complex bridged by squarate molecules was synthesized, and their structural and magnetic properties were studied. X-ray structure determination revealed that MnII complex, [MnII4(C4O4)4(C4H4N2)(H2O)8], had a three-dimensional network structure bridged by squarates with cavities which trap pyrazine molecules. Pyrazine molecules have an orientational disorder even at 10 K in the cavities. They are stabilized by weak hydrogen bonds with a network formed by squarates. A weak antiferromagnetic exchange interaction is observed between magnetic moments on Mn2+ ions through squarate. In the case of one-dimensional polymer chain complexes, MII(C4O4)(C4H4N2)(H2O)4 (where MII = FeII, NiII, CuII), which are bridged by pyrazine molecules, the temperature dependence of magnetic susceptibility follows Bonner–Fischer’s one dimensional chain model. The antiferromagnetic exchange parameter for CuII complex is slightly larger than those for FeII and NiII complexes. This difference is considered to be caused by the difference of the metal to metal distances. In the case of [CoII(C4O4)(C4H4N2)(H2O)4], clear anisotropy of the magnetic properties was observed, which was caused by large zero-field splitting.
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