Abstract Mixedvalence U(VI)/U(IV) compound with organic anionic ligand bridging uranium atoms in different oxidation states was synthesized at room temperature. Coordination polyhedron of U(VI) atom is a pentagonal bipyramide whose equatorial positions are occupied by nitrogen and two oxygen atoms of one DPA 2− anion, oxygen atom of another DPA 2− anion and a water molecule. Second uranium atom U(IV)