Experimental and theoretical study of the regiospecific coordination of [Ru.sup.II] and [Os.sup.II] fragments on the lacunary polyoxometalate [[alpha-P[W.sub.11][O.sub.39]].sub.7-]

The investigation of the bidentate coordination of ruthenium and osmium fragments toward the lacunary heteropolyoxoanion, [[alpha-P[W.sub.11][O.sub.39]].sub.7-] was performed. The findings underscores the versatility of the [[alpha-P[W.sub.11][O.sub.39]].sub.7-] ligand, which experimentally allows both bi and pentadentate coordination modes.