Two WV–MnIII bimetallic compounds, [Mn(Cl-salmen)(H2O)2]([Mn(5-Clsalmen)(H2O)]2[W(CN)8]·2H2O (1·2H2O) [5-Clsalmen = N, N′-(1-methylethylene)bis(5-chlorosalicylideneiminato) dianion], which contains trinuclear Mn2W and isolated MnIII moieties, and [Mn(3-MeOsalcy)(H2O)2]3[W(CN)8]·2H2O (2·2H2O) [3-MeOsalcy = N, N′-(trans-1,2-cyclohexanediylethylene)bis(3-methoxysalicylideneiminato) dianion] molecules were prepared in redox processes and characterized using X-ray analysis and magnetic measurements. Compound 1 is composed of the ([Mn(5-Clsalmen)(H2O)]2[W(CN)8])− trimer, in which two CN groups among eight in [W(CN)8]3− bridge W5+ and two Mn3+ ions and the remaining CN ligands are hydrogen-bonded to water molecules or unbound, and the [Mn(Cl-salmen)(H2O)2]+ cation. Subsequently, two water molecules of the isolated cation are subject to hydrogen bonds. For 2, there are no covalent bonds among the subunits and six serial stacks of [Mn(3-MeOsalcy)(H2O)2]+ units are all hydrogen-bonded. The many hydrogen bonds found in both complexes eventually lead to three-dimensional networks. The magnetic studies for 1 reveal that antiferromagnetic interactions (J = −5.4 cm−1) between WV and MnIII centers within the trimer are transmitted via the bridging CN groups. Intermolecular antiferromagnetic couplings (zJ′ = −0.2 cm−1) are also observed. The static and dynamic magnetic data of 1 demonstrate the existence of a field-induced spin-flop transition occurring among the clusters and monomeric molecules.
|Number of pages||7|
|Journal||Journal of the Chemical Society. Dalton Transactions|
|Publication status||Published - 2007 Mar 30|
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