Sandwich-type tungstoantimonates decorated by the heterometallic 3d–5p clusters

A new sandwich-type tungstoantimonate (NH4)9{Cu3Sb(H2O)3(SbW9O33)2}·22H2O (1) was synthesized by reaction of the preformed large cluster [NaSb9W21O86]18 − ({Sb9W21}) and transition-metal cations. Compound 1 is a 3d–5p heterometallic cluster-containing sandwich-type tungstoantimonate, which was further connected by the H-bonding interactions into a (4, 4)-connected two dimensional (2D) supramolecular framework. Further, the introduction of the alkali metal cations into the reaction system leads to a 2D framework based on the sandwich-type tungstoantimonate by water substitution: Na(NH4)9{SbCu3Cl(SbW9O33)2}·14H2O (2).