A series of unprecedented triol-stabilized [H3MW6O24]n−: the missing piece between A- and B-type Anderson–Evans polyoxometalates

Abstract

Several novel triol-ligands functionalized Anderson–Evans type polyoxotungstates, K₃Na₃[{HOCH₂C(CH₂O)₃}AlO₃W₆O₁₈], K₃Na₃[{HOCH₂C(CH₂O)₃}CrO₃W₆O₁₈], K₃Na₃[{HOCH₂C(CH₂O)₃}CoO₃W₆O₁₈], and K₃Na₃[{H₃CC(CH₂O)₃}CoO₃W₆O₁₈], were successfully synthesized and characterized, in which some of the central metal ions have never been found in the Anderson-type polyoxotungstates. The single crystal X-ray diffraction analysis indicated that the clusters were on a status, in which only one-side μ₃-O was protonated. This indicates that the three-protonated cluster is a common type of Anderson cluster aside zero-protonated (A-type) and six-protonated (B-type), which could be named as the T-type.