Binuclear and polynuclear cymantrenecarboxylate complexes of heavy lanthanides

New binuclear cymantrenecarboxylate complexes of rare-earth metals, [Ln(2)(mu-O,eta(2)-O(2)CCym)(2)(mu(2)-O,O'-O(2)CCym)(2)(eta(2)-O(2)CCym)(2)(DMSO)(4)] (Ln = Tb (I), Dy (II); Cym = (eta(5)-C5H4)Mn(CO)(3)) and [Ln(2)(mu(2)-O,O'-O(2)CCym)(4)(eta(2)-NO3)(2)(DMSO)(4)] (Ln = Tb (III), Dy (IV)), are synthesized and characterized by X-ray diffraction analysis. The carboxylate clusters containing the Mn2+ ion, which is formed due to the destruction of the cymantrenenecarboxylate anion, [Tb-4(mu(3)-OH)(4)(mu(2)-O,O'-O(2)CCym)(6)(H2O)(3)(THF)(4)][MnCl4] center dot 4CH(2)Cl(2) center dot 6THF (V) with the cubane-like structure, and [Er2Mn(mu(2)-O(2)CCym)(6)(eta(2)-O(2)CCym)(2)((MeO)(3)PO)(4)] center dot 2MePh (VI) with linear structure, are also obtained. The magnetism of complexes I, II, V, and VI is studied in a direct magnetic field. The magnetic properties of complexes II and VI are studied in direct and alternating magnetic fields. Complex II exhibits the properties of a single-molecule magnet. The thermal decomposition of complexes I-IV is studied by differential scanning calorimetry and thermogravimetric analysis. According to the X-ray diffraction analysis data, the final thermolysis products of complexes III and IV in air are multiferroics LnMn(2)O(5).