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Oxalate ligands in NbV oxalate complexes are labile, making the latter convenient niobium source for preparation of new mixed W/Nb polyoxometalates under mild conditions. Reactions of [NbO(C2O4)2(H2O)2]– with [α‐B‐XW9O33]9– (X = As, Sb) result in formation of sandwich‐type anions. For X = As, [(α‐B‐AsW9O33)2(NbO)3(H2O)]9– and [(α‐B‐AsW9O33)2(NbO)2(H2O)]12– were the products. In the case of antimony,...
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