Uranium(VI) Tetraoxido Core Coordinated by Bidentate Nitrate

The synthesis and structural characterization of the compounds K[(UO2)2(UO4)(OH)(NO3)2]H2O (1) and Ba[(UO2)4(UO4)2(OH)2(NO3)4]H2O (2) have revealed that each contains sheets that are based upon the β-U3O8-type topology and that these sheets are linked through low-valence interlayer cations. Consistent with other uranium(VI) compounds that have topologically identical sheets, one of the uranium(VI) sites exhibits a highly unusual (UO4)2− tetraoxido core that is further coordinated by two bidentate (NO3)− groups.