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Three new uranyl chromate-dichromates, [dabcoH 2][(UO 2)(CrO 4)(Cr 2O 7)](H 2O) 2 (1), [dmedaH 2][(UO 2)(CrO 4)(Cr 2O 7)](H 2O) (2), and [pyH] 4[(UO 2)(CrO 4) 2(Cr 2O 7)] (3) were prepared by evaporation of aqueous solutions under ambient conditions. Compound 1 is triclinic, P1¯, a = 7.2533(15), b = 10.328(2), c = 12.399(2) Å, α = 89.292(4), β = 88.124(4), γ = 78.753(4)°, V = 910.5(3) Å 3, R 1 = 0.024; 2is monoclinic, P2 1/с, a = 7.315(4), b = 14.684(8), c = 15.812(9) Å, β = 99.696(12)°, V = 1674.2(15) Å 3, R 1 = 0.034; 3 is orthorhombic, Pnma, a = 16.396(4), b = 21.129(6), c = 7.119(2) Å, V = 2466.1(12) Å 3, R 1 = 0.045. In the crystal structures of 1 and 2, the UO 7 bipyramids and CrO 4 tetrahedra share vertices to form 1∞[(UO 2)(CrO 4)] chains; the dichromate groups Cr 2O 7decorate them with formation of 1∞[(UO 2)(CrO 4)(Cr 2O 7)] 2−chains. In 3,polymerization of 1∞[(UO 2)(CrO 4)(Cr 2O 7)] 2−chains produced 2∞[(UO 2)(CrO 4) 2(Cr 2O 7)] 4−layers. The protonated organic molecules are located in the interlayer and connect to the inorganic backbones via a system of hydrogen bonds. We discuss the structural peculiarities of uranyl chromate-dichromate complexes and the effects of template nature on their geometrical features.
Original language | English |
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Article number | 129494 |
Journal | Journal of Molecular Structure |
Early online date | 20 Oct 2020 |
DOIs | |
State | Published - 2020 |
ID: 70165682