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# Exploration of Composition Space in Templated Uranium Sulfates

journal contribution

posted on 2003-10-04, 00:00 authored by Michael B. Doran, Alexander J. Norquist, Dermot O'HareThe phase stability of organically templated uranium sulfates in the [UO

_{2}(CH_{3}CO_{2})_{2}·2H_{2}O/homopiperazine/H_{2}SO_{4}] and [UO_{2}(CH_{3}CO_{2})_{2}·2H_{2}O/*N*,*N*-dimethylethylenediamine/H_{2}SO_{4}] systems has been studied using composition space. Two new compounds were formed in each system; [N_{2}C_{5}H_{14}]_{2}[UO_{2}(SO_{4})_{3}] (USO-17) and [N_{2}C_{5}H_{14}][UO_{2}(H_{2}O)(SO_{4})_{2}] (USO-18) contain homopiperazine, and [N_{2}C_{4}H_{14}][UO_{2}(SO_{4})_{2}] (USO-19) and [N_{2}C_{4}H_{14}][(UO_{2})_{2}(H_{2}O)(SO_{4})_{3}]·H_{2}O (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,*C*2/*c*(No. 15),*Z*= 4; for USO-18,*a*= 7.6955(2) Å,*b*= 11.7717(3) Å,*c*= 14.7038(4) Å, orthorhombic,*P*22_{1}2_{1}(No. 18),*Z*= 4; for USO-19,*a*= 9.3322(1) Å,*b*= 9.7743(2) Å,*c*= 13.8897(3) Å, orthorhombic,*P*2_{1}2_{1}2_{1}(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,*P*2_{1}/*c*(No. 14),*Z*= 4.