Syntheses, Structures, and Magnetic Properties of Three Manganese(II)-Octacyanotungstate(V) Bimetallic Compounds with Linear Ligands
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Three manganese(II)-octacyanotungstate(V) bimetallic compounds, [Mn(H2O)2(dpe)]3[W(CN)8]2·2dpe·7H2O (dpe = trans-1,2-di(4-pyridyl)ethene) (1), [Mn(H2O)2(azpy)]3[W(CN)8]2·3azpy·4H2O (azpy = 4,4′-azopyridine) (2), and [Mn(H2O)3(azpy)]2[Mn(CH3CN)2(azpy)][W(CN)8]2·5azpy·2H2O (3) were prepared by in situ or secondary assembly methods. Compounds 1 and 2 show three-dimensional (3D) networks through the cross-link of one-dimensional (1D) infinite 3,2-chains or rope-ladder chains with linear ligands (dpe, azpy), while compound 3 adopts a 1D ribbon-like structure by the connection of pentanuclear repeating units with azpy linkers. Magnetic studies reveal that compounds 1–3 show intramolecular antiferromagnetic coupling between Mn(II) and W(V) centers, which produce the typical ferrimagnetic chain behaviors for compounds 1 and 2 but paramagnetic properties for compound 3. Notably, field-induced metamagnetic behavior was detected for compound 2, indicating it undergoes a transition from the antiferromagnetic ground state to ferrimagnetic phase above critical dc field.
