Synthesis and crystal structure of (C3N5H6S)2[UO2(C2O4)2(H2O)] · C2N4H4

Abstract

The formation of the thioammelinium cation in an aqueous solution in the presence of uranyl ions is demonstrated. Single crystal X-ray diffraction study of (C3N5H6S)2[UO2(C2O4)2(H2O)] · C2N4H4 was carried out and the geometric characteristics of thioammelinium were determined for the first time. The crystals are triclinc, space group \(P\bar 1\), Z = 2, a = 8.5201(11) A, b = 11.4027(14) A, c = 14.329(2) A, α = 103.182(5)°, β = 99.607(6)°, γ = 109.698(4)°, R = 0.0526. The main structural units in the crystal are mononuclear complex groups [UO2(C2O4)2(H2O)]2− corresponding to the crystal chemical group AB201M1 (A = UO22+, B01 = C2O42−, M1 = H2O) of uranyl complexes. Uranium-containing mononuclear complexes are connected into a three-dimensional framework through electrostatic interactions and hydrogen bonds involving thioammelinium ions, water molecules, and cyanoguanidine.