Heteropolyanions, [GaNb18O54](15-) and [AlNb18O54](15-), have been synthesized and characterized. These represent the first examples of introducing group III elements into the heteropolyniobate family; achieved via compatible alkaline aqueous chemistry of group IIIA monomers and Nb-polyoxoanions. The open structure of the polyniobate results in expanded coordination of the tetrahedral Ga in aqueous medium.
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