Abstract
New iodoacetate complexes of uranyl with imidazoles have been synthesized: (C3H5N2)[UO2(mia)3] (I) and (C4H7N2)[UO2(mia)3] (II), where mia is the iodoacetate ion CH2ICOOˉ, C3H5N \(_{2}^{ + }\) is the imidazolium cation, and C4H7N \(_{2}^{ + }\) is the 2-methylimidazolium cation. The complexes were studied by IR spectroscopy, thermography, and X-ray diffractometry. In crystals I and II, each uranium(VI) atom coordinates three cyclic bidentate mia anions, forming a hexagonal bipyramidal complex [UO2(mia)3]ˉ with the crystal chemical formula A(B01)3, where A = UO \(_{2}^{{2 + }}\) and B01 = mia. The nonvalence interactions in the structures of crystals I and II were analyzed by the Voronoi–Dirichlet polyhedra method. It was established that, in addition to hydrogen bonds, the U=O⋅⋅⋅I−C halogen bonds also contribute to the formation of the supramolecular structure of crystals II.
