[en] UO₂Cl₂ and Cs(UO₂)₂Cl₅ structures are determined using the method of roentgenography of monocrystals grown from the melt. It is shown that interatomic distances and valence angles in the UO₂Cl₂ structure are in a good agreement with the data of structure interpretation using the method of neutron diffraction of the UO₂Cl₂ powder. It is shown that the Cs(UO₂)₂Cl₅ structure is constructed of dipyramidal-pentagonal (UO₂Cl₅) complex, bound into the polymer skeleton by the mutual vertex and mutual ribs so that the [(UO₂)₂Cl₅]^- complex anion and Cs⁺ cation are the main structural units. UO₂²⁺ groups are almost linear, symmetric (U-O=0.166; ).165 nm) and oriented approximately over the normal to the equator bipyromid plane, somewhat corru.g.ated, in which 5 Cl atoms are situated (U-Cl=0.254; 0.277; 0.275; 0.276, 0.284 nm). Equator planes connected by a joint vertex from the angle of approximately 150 deg. Cs and Cl atoms form a polymer Cs-Cl-Cs-Cl chain which unites the structure into a trimetric skeleton. The Cs-Cl distances in the chain are 0.320; 0.338 nm