(C3H12N2)(2)[UO2(H2O)(2)(SO4)(2)](2)center dot 2H(2)O: an organically templated uranium sulfate with a novel dimer type

The title compound, bis(propane-1,2-diaminium) tetraaquadi-μ 2-sulfato-disulfatotetraoxodiuranate(VI) dihydrate, (C 3H12N2)2[U2O 4(SO4)4(H2O) 4]·2H2O, contains discrete centrosymmetric anionic {[UO2(H2O)2(SO4)2] 2}4- dimers with C3H12N 22+ cations balancing the charge. The dimers form hydrogen-bonded layers. The cations and occluded water molecules participate in an extensive hydrogen-bonding network. Each UVI centre is seven-coordinate with a pentagonal-bipyramidal geometry. Both pendent and bridging sulfate tetrahedra are observed, as well as bound and occluded water molecules. © 2005 International Union of Crystallography Printed in Great Britain - all rights reserved