Crystal structures of new uranyl glutarate coordination polymers (NH4)2[(UO2)2(glt)3]·nH2O (n = 3 or 6) and R[UO2(glt)(Hglt)]·H2O (R = Na, K, Rb or Cs)

Six novel uranyl compounds with glutarate anions, (NH4)2[(UO2)2(glt)3]·6H2O (1), (NH4)2[(UO2)2(glt)3]·3H2O (2) and R[UO2(glt)(Hglt)]·H2O, where R = Na (3), K (4), Rb (5) or Cs (6), were synthesized and characterized by single crystal X-ray diffraction. The uranyl cations in 1 and 2 form complexes with an A2Q023 crystallochemical formula, whereas the uranyl complexes in 3–6 correspond to an AQ02B01 crystallochemical formula (A = UO22+, Q02 = glt2−, B01 = Hglt−). The structures of 1 and 2 are 2D coordination polymers. In 3–6, the main structural units are [UO2(glt)(Hglt)]− chains united by hydrogen bonds into sheets (3 and 4) or interpenetrating frameworks (5 and 6). The crystal structures of more than 30 uranyl compounds with anions of glutaric, thiodiglycolic, iminodiacetic and oxidiacetic acids were used to analyze the coordination abilities of dicarboxylate anions with uranium.

Graphical abstractSix new 2D and 1D uranium glutarate coordination polymers were obtained in the form of single crystals and their structures were studied by XRD. The influence of outer sphere alkaline cations on the characteristics of the uranium sublattice is considered. The features of the coordination of some dicarboxylate anions in uranium(VI) compounds are discussed.Figure optionsDownload full-size imageDownload as PowerPoint slide