Crystal Engineering with the Uranyl Cation I. Aliphatic Carboxylate Coordination Polymers: Synthesis, Crystal Structures, and Fluorescent Properties

Four novel U(VI) containing coordination polymers, UO2(C7H10O4) (1), UO2(C8H12O4) (2), UO2(C9H14O4) (3), and
UO2(C10H16O4) (4), were synthesized from UO2(NO3)2·6H2O and aliphatic dicarboxylic acids (pimelic, suberic, azelaic, and sebacic
acids, respectively) using hydrothermal techniques and were characterized by single-crystal diffraction. Compounds 1 and 4 consist
of (UO2)2O8 dimers connected by the acid molecules to form layers, whereas 2 and 3 are constructed of chains of hexagonal bipyramids
connected to form layers. These materials complete the series of aliphatic uranyl carboxylates to C10 (sebacic acid) and may be
considered to be carboxylate “end-members” of a series of dipyridyl/carboxylate structures described in part II of this investigation
(following in this issue).