Reinvestigation of Dilacunary 19-Tungsto-2-Arsenate(III) [AsIII2W19O67(H2O)]14- Including 183W NMR Solution Study

We have reinvestigated the dilacunary 19-tungsto-2-arsenate(III) [AsIII2W19O67(H2O)]14- (1), resulting in the mixed potassium-sodium salt K8Na6[AsIII2W19O67(H2O)]·28H2O (KNa-1), which was structurally characterized in the solid state by single-crystal XRD, IR, TGA, and elemental analysis, as well as in aqueous solution by 183W NMR for the first time.