Synthesis and X-ray diffraction study of K4[(UO2)2(C2O4)3(NCS)2] · 4H2O

Abstract

Single crystals of K4[(UO2)2(C2O4)3(NCS)2] · 4H2O(I) have been synthesized and studied by X-ray diffraction. The crystals are monoclinic with the unit cell parameters a = 8.0226(7) A, b = 14.9493(11) A, c = 11.1670(9) A, β = 98.299(3)°, space group P21/n, Z = 2, V = 1325.26(19) A3, R = 0.0186. The main structural units of the crystals of structure I are discrete binuclear groups [(UO2)2(C2O4)3(NCS)2]4− belonging to the crystal-chemical group A2K02B201 M21 (A =UO22+, K02 =C2O42−, B01 =C2O42−, M1 = NCS−) of the uranyl complexes. The uranium-containing complexes are linked into a three-dimensional framework through the potassium ions and a system of hydrogen bonds involving the outer-sphere water molecules.