Abstract
Single crystal X-ray diffraction has been applied to determine the structures of two new uranyl coordination polymers: K2[(UO2)2(C4H4O4)3] (1) and [Mg(H2O)6] [(UO2)2(C4H4O4)3]·2H2O (2), where C4H4O42- is succinate anion. Crystals of 1 and 2 contain polymeric complex anions [(UO2)2(C4H4O4)3]2- with the same A2Q023 crystallochemical formula (A=UO22+, Q02=C4O4H42-), and have layered (1) or chain (2) structure. It has been found, that conformation of succinate ions is one of the factors, which affects the structure of [(UO2)2(C4H4O4)3]2- anions. IR spectra of these new compounds are in good agreement with crystallographic data. Topological analysis of the uranium dicarboxylates with A2Q023 crystallochemical formula has shown the presence of five isomers which differ from each other in coordination sequences and / or dimensionality.
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