Synthesis and X-ray diffraction study of R[UO2(CH3COO)3] (R = H3O+ or NH(C2H5) 3 + )

Abstract

Single crystals of (H3O)[UO2(CH3COO)3] (I) and (NH(C2H5)3)[UO2(CH3COO)3] (II) are synthesized, and their structures are studied by X-ray crystallography. Compound I crystallizes in the tetragonal crystal system with the unit cell parameters a = 13.70640(10) A, c = 27.5258(5) A, V = 5171.14(11) A3, space group I41/a, Z = 16, R = 0.0238. The crystals of compound II are orthorhombic with the parameters a = 13.3685(3) A, b = 10.6990(3) A, c = 12.2616(3) A, V = 1753.77(8) A3, space group Pna21, Z = 4, R = 0.0228. The uranium-containing structural units of crystals I and II are [UO2(CH3COO)3]− island mononuclear groups belonging to the A B 3 01 (A = UO 2 2+ , B01 = CH3COO−) crystal-chemical group of uranyl complexes. [UO2(CH3COO)3]− complexes are linked into a three-dimensional framework by electrostatic interactions with the outer-sphere cations and by hydrogen bonds involving the hydrogen atoms of hydroxonium (I) or triethylammonium (II) with the oxygen atoms of the acetato groups.