The formation of [{Co-II(teta)(2)}{Co-2(II)(tren)-(teta)(2)}(VISSb6O42)-Sb-IV-O-III(H2O)]center dot ca.9H(2)O [teta = triethylenetetra-amine; tren = tris(2-aminoethyl)amine] illustrates a strategy toward reducing the molecular charge of polyoxovanadates, a key challenge in their use as components in single-molecule electronics. Here, a V-O-Co bond to a binuclear Co2+- centered complex and a Sb-N bond to the terminal N atom of a teta ligand of a mononuclear Co2+ complex allow for full charge compensation of the archetypal molecular magnet [V15Sb6O42(H2O)](6-). Density functional theory based electron localization function analysis demonstrates that the Sb-N bond has an electron density similar to that of a Sb-O bond. Magnetic exchange coupling between the V-IV and Co-II spin centers mediated via the Sb-N bridge is comparably weakly antiferromagnetic.