Abstract: | Uranyl triacetate complexes (Cs0.5Ba0.25)UO2(CH3COO)3] (I) and Ba0.5UO2(CH3COO)3] (II) are synthesized for the first time and their structures are determined by X-ray diffraction. Both compounds crystallize
in the cubic crystal system. The crystal data are as follows: a = 17.3289(7) ?, V = 5203.7(4) ?3, space group I213 and Z = 16 (I); a = 17.0515(8)?, V = 4957.8(4) ?3, space group I
$
\bar 4
$
\bar 4
3d, and Z = 16 (II). In I and II, as in all uranyl triacetates studied earlier, the coordination polyhedron of the uranium atom is a hexagonal bipyramid whose
vertices are occupied by the oxygen atoms of the uranyl and three acetate groups. The uranium-containing group belongs to
the AB
301 (A = UO22+, B
01 = CH3COO−) crystal chemical group of uranyl complexes. It was found that compound II is isostructural to the (Rb0.50Ba0.25)UO2(CH3COO)3] studied earlier. |