An Unexpected Ferromagnetic Coupling in a Dinuclear Manganese(II) Linked Trivacant Heteropolymolybdate Derivative

An unexpected ferromagnetically coupled dinuclear manganese(II) linked trivacant heteropolymolybdate [HN(CH3)(3)](10)-[Mn-2((VMo9O33)-Mo-V)(2)]center dot 10H(2)O (1) has been synthesized in aqueous solution and characterized by elemental analysis, IR spectroscopy, thermal gravimetric analysis, and single-crystal X-ray diffraction. A new kind of heteropolymolybdate [VMo9O33](7-) anion is shown. The magnetic properties of 1 indicate typical ferromagnetic interactions through the Mn-II-O-Mn-II bridge unit. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)