Tetra-μ2-acetato-tetraaquadi-μ3-oxido- octaoxidotetrauranium(VI) methanol disolvate tetrahydrate

Abstract

The centrosymmetric title tetra-mer, [U4(C2H 3O2)4O10(H2O) 4]·2CH4O, has a near planar core [maximum deviation from the least squares plane of 0.294 (6) Å]. It consists of two hexa-gonal-bipyramidally coordinated UVI atoms connected via 2-O (acetate) and 3-O (oxide) bridges in the equatorial plane to two penta-gonal-bipyramidally coordinated UVI atoms. The equatorial plane of each UVI atom is completed by a bound water molecule, while the axial positions are occupied by uranyl (UO2)2+ O atoms. Multiple O - H⋯O hydrogen bonds are present, including a lattice methanol molecule bound to one of the penta-gonal bipyramidal uranyl O atoms, as well as two different C 1 1(6) chains orginating from a donor water molecule, via a uranyl oxygen acceptor and an acetate acceptor on different, adjacent tetra-mers. Finally, the unit cell contains four UVI tetra-mers, all connected by hydrogen bonding, forming a supra-molecular R 44(24) ring.