Acetate-Functionalized Zirconium-Substituted Tungstogermanate, [Zr4O2(OH)2(CH3COO)2(α-GeW10O37)2]12−

The two acetate-functionalized zirconium(IV)-substituted tungstogermanates, Na8K4[Zr4O2(OH)2(CH3COO)2(α-GeW10O37)2] · 33H2O and Na8Cs4[Zr4O2(OH)2(CH3COO)2(α-GeW10O37)2] · 32H2O, were synthesized by the reaction of ZrOCl2 with [A-α-GeW9O34]10− in pH = 4.8 buffer and their structures were determined by single-crystal X-ray analysis. Both of them contain a centrosymmetric polyanion [Zr4O2(OH)2(CH3COO)2(α-GeW10O37)2]12− consisting of two {α-GeW10O37} units sandwiching an inorganic–organic hybrid {Zr4O2(OH)2(CH3COO)2} cluster. The polyanion contains a mixing of seven- and eight-coordinate Zr centres. The two compounds were also characterized by elemental analysis, IR spectroscopy, UV–vis and TG–DSC analysis.