One-dimensional uranyl-2,2'-bipyridine coordination polymer with cation-cation interactions: (UO2)2(2,2'-bpy)(CH3CO2)(O)(OH).

A uranyl-2,2'-bipyridine coordination polymer, (UO(2))(2)(2,2'-bpy)(CH(3)CO(2))(O)(OH) (1; 2,2'-bpy = 2,2'-bipyridine) has been synthesized hydrothermally at 165 °C and characterized via single-crystal X-ray diffraction and UV-vis-near-IR, fluorescence, and IR spectroscopies. The structure consists of two uranyl pentagonal bipyramids that are linked through cation-cation interactions (CCIs) to form chains that are truncated in the second and third dimensions by 2,2'-bpy. These chains of uranyl polyhedra consist of a rare case of CCIs through the edge-sharing polyhedral connection mode instead of the more common corner-sharing connection mode. 1 is the first uranium(VI) compound reported that contains CCIs in which the structural unit is one-dimensional, although lower-dimensional structural units with CCIs are known for pentavalent actinides.