Polyoxotungstates containing uranyl group: Germanotungstates with Keggin sandwich structure

Two new polygermanotungstates containing uranyl group A-α-Na14[Na2(UO2)2(GeW9O34)2] · 48H2O (1) and A-β-Na14[Na2(UO2)2(GeW9O34)2] · 42H2O (2) have been synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction. Both the two polyanions consist of two [GeW9O34]10− units which sandwich two UO22+ cations and two Na+ cations. The two uranium atoms are similar to each other, that is, each uranium is pentagonal–bipyramidal coordination achieved by three equatorial U–O bonds to one GeW9O34 and two U–O bonds to the other.

Two new sandwich structure of polygermanotungstates containing uranyl groups A-α-Na14[Na2(UO2)2(GeW9O34)2] · 48H2O and A-β-Na14[Na2(UO2)2(GeW9O34)2] · 42H2O were synthesized and their structures investigated by elemental analysis, IR and single-crystal X-ray diffraction.Figure optionsDownload as PowerPoint slide