A second polymorph of catena-poly[[aquadioxidouranium(VI)]bis(mu-methanesulfonato-kappa O-2 : O ')]

The monoclinic (space group P2(1)/c) title compound, [UO2(CH3O3S)(2)(H2O)](n), is a polymorphic modification of the known orthorhombic ( space group Pbcn) variant of this stoichiometry [Wilson (1978). Acta Cryst. B34, 2302 - 2303]. The crystal structure consists of infinite [UO2(CH3SO3)(2)(H2O)] chains along the a axis. The coordination polyhedron of the U atom is a pentagonal bipyramid, whose equatorial plane consists of the O atoms of four methanesulfonate anions and one water molecule. The axial positions are occupied by O atoms of a nearly linear and symmetrical uranyl group. The methanesulfonate anions function as bidentate bridging ligands. The crystal structure involves intermolecular O H center dot center dot center dot O hydrogen bonds.