Isolation of a tetrameric cation-cation complex of pentavalent uranyl

The reaction of {[U[O.sub.2][Py.sub.5][[K].sub.2-][Py.suib.2]}.sub.n] polymer is investigated. The findings expand the scope for the preparation of polymetallic assemblies involving f-elements and a rich chemistry can be anticipated from the reaction of pentavalent uranyl with different metal cations.