STUDY ON SYNTHESIS, STRUCTURE AND COMPLEXATION CHARACTERISTIC OF UO2Cl4（DCH 18C6·H3O）2*

The title compound was synthesized by extracting nranylchloride in HC1 system using dicyclohexyl-18-crown-6 as extraction agent. The absorption peaks 1090 cmand 912 cmin IR spectrum result from frequence red-shift of anti-symmetric stretch vibration of C—O—C of crown ring and [OUO] group, respectively.X-ray diffraction analysis results in its crystallographic parameters: triclinic system, space group P; a=10.183（3）, b=10.606（3）, c=12.850（6）, α=72.09（3）, β=85.97（4）, γ=86.14（2）°, V=1315.7, z=1. The structure was solved by heavy atom method. Structure refinements converged to final R=0.062, R=0.061. U atom is situated on the symmetry center and coordinated by four chlorine atoms and two oxygen atoms to form a square bipyramid coordination polyhedron. The HOgroup is embedded in the crown ring and connected with three crown oxygen atoms via hydrogen bonds.