New Monoiodoacetate Complexes of Uranyl: Synthesis and Structure

Synthesis, IR spectroscopic, and X-ray diffraction study of crystals of two new iodoacetate complexes of uranyl: [UO2(mia)(2)(H2O)(2)](2)center dot 2(C3H6N2O) (I) and (CN3H6)(2)[UO2(mia)(3)](2)center dot(C2N4H4) (II) were performed, where mia is the CH2ICOO- iodoacetate ion, C3H6N2O is ethylene urea, and C2N4H4 is cyanoguanidine. In crystals of I, each U(VI) atom of the uranyl group coordinates two water molecules and two bidentate cyclic anions mia, forming a hexagonal bipyramidal complex with the crystal chemical formula A(B-01)(2)(\M-1)(2), where A = UO22+, B-01 = mia. M-1 = H2O. The uranium-containing structural units of II crystals are mononuclear [UO2(mia)(3)](-) complexes with the crystal chemical formula A(B-01)(3), where A = UO22+, B-01 = mia. Using the parameters of the Voronoi-Dirichlet polyhedra of iodine atoms, it was found that in structure II, halogen bonds U=O center dot center dot center dot I-C are involved in the binding of neighboring [UO2(mia)(3)](-) complexes.

Automated summary

Crystals of two new iodoacetate complexes of uranyl have been synthesized and characterized using IR spectroscopy and X-ray diffraction.