Exploration of Composition Space in Templated Uranium Sulfates

The phase stability of organically templated uranium sulfates in the [UO₂(CH₃CO₂)₂·2H₂O/homopiperazine/H₂SO₄] and [UO₂(CH₃CO₂)₂·2H₂O/N,N-dimethylethylenediamine/H₂SO₄] systems has been studied using composition space. Two new compounds were formed in each system; [N₂C₅H₁₄]₂[UO₂(SO₄)₃] (USO-17) and [N₂C₅H₁₄][UO₂(H₂O)(SO₄)₂] (USO-18) contain homopiperazine, and [N₂C₄H₁₄][UO₂(SO₄)₂] (USO-19) and [N₂C₄H₁₄][(UO₂)₂(H₂O)(SO₄)₃]·H₂O (USO-20) contain N,N-dimethylethylenediamine. The relative stability of the products from each system is dependent upon the reactant mole fractions in the initial reaction gel. Crystal data:  USO-17, a = 14.4975(3) Å, b = 11.9109(3) Å, c = 13.0157(3) Å, β = 110.475(1)°, monoclinic, C2/c (No. 15), Z = 4; for USO-18, a = 7.6955(2) Å, b = 11.7717(3) Å, c = 14.7038(4) Å, orthorhombic, P22₁2₁ (No. 18), Z = 4; for USO-19, a = 9.3322(1) Å, b = 9.7743(2) Å, c = 13.8897(3) Å, orthorhombic, P2₁2₁2₁ (No. 19), Z = 4; and for USO-20, a = 11.2460(2) Å, b = 10.5387(2) Å, c = 17.0432(3) Å, β = 92.9884(6)°, monoclinic, P2₁/c (No. 14), Z = 4.