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Addition of the Cl -0  anions to the synthesis mixture stabilizes specific structures of uranyl complexes which results in new compounds with the unprecedented structural topologies. ((CH 3 ) 2 CHNH 3 )[(UO 2 )(CrO 4 ) · Cl(H 2 O)]  is a new member of the small family of compounds based upon the  Ur ( X m  O  n  ) 5  ( X  = Cl, Br, I) bipyramids. The structure is based upon uranyl chloride chromate layers that alternate with the layers of protonated amine molecules. The layers contain  Ur ClO 4  pentagonal bipyramids that share three of its equatorial corners with CrO 4  tetrahedra.    Topological analysis shows that the [(UO 2 )(CrO 4 )Cl(H 2 O)] -0  layer belongs to the same topology of interpolyhedral linkage as in  α -UO 2 MoO 4 (H 2 O) 2 . This type of topology (linkage of 4-membered rings creating 8-membered rings) is known in silicate crystal chemistry as the topology of the [Si 4 O 10 ] layers in the minerals of the apophyllite group. Their linkage via various intermediate units results in a large family of open-framework and pillared silicates.

zeitschrift für kristallographie - crystalline materials

Mixed-ligand coordination of the (UO 2 ) 2+  cation and apophyllite topology of uranyl chlorochromate layer in the structure of ((CH 3 ) 2 CHNH 3 )[(UO 2 )(CrO 4 )Cl(H 2 O)]