Synthesis and crystal structure of Rb2[(UO2)2(C2O4)2(SeO4)] • 1.33H2O

The single crystals of Rb-2[(UO2)(2)(C2O4)(2)(SeO4)] center dot 1.33H(2)O were synthesized and studied by X-ray diffraction. The crystals are monoclinic, space group P2(1)/m, Z= 2, the unit cell parameters: a = 5.6537(8), b = 18.736(3), c = 9.4535(15) angstrom, beta = 98.440(5)degrees, V = 990.6(3) angstrom(3), R (1) = 0.0506. The main structural units of the crystal are infinite layers of [(UO2)(2)(C2O4)(2)(SeO4)](2-), corresponding to the crystal chemical group A(2)K(02)B(2) (A = UO22+, K-02 = C2O42-, B-2 = SeO42-) of uranyl complexes. The uranium-containing layers are united into a three-dimensional framework through the electrostatic interactions with the outer-sphere rubidium ions and the hydrogen bonding system involving the outer-sphere water molecules.