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The reaction of UO 3  with SeO 2  in the presence of SrCl 2 ⋅6H 2 O and Sr(OH) 2 ⋅8H 2 O in supercritical water at 425 °C for 3 d results in the formation of the new strontium uranyl selenites, Sr[(UO 2 ) 3 (SeO 3 ) 2 O 2 ]⋅4H 2 O (1) and Sr[UO 2 (SeO 3 ) 2 ] (2). The single crystal X-ray structures of type 1 and type 2 were solved by direct methods and refined by full-matrix least-squares methods. Crystallographic data (193 K): (1), monoclinic, space group C2/m, a = 17.014(2), b = 7.0637(7), and c = 7.1084(7) Å, β = 100.544(2)°, Z = 2, R(F) = 0.0361 for 79 parameters with 1132 reflections with I &gt; 2σ(I), wR2 = 0.0998 for all data; (2), triclinic, space group P1̅ , a = 5.6722(4), b = 6.7627(5), and c = 11.2622(8) Å, α = 104.698(1)°, β = 93.708(1)°, γ = 109.489(1)°, Z = 2, R(F) = 0.0373 for 110 parameters with 1902 reflections with I &gt; 2σ(I), wR 2  = 0.0856 for all data. The structure of type 1 contains two-dimensional  2  ∞  [(UO 2 ) 3 (SeO 3 ) 2 O 2 ] 2 - sheets with the same topology as those found in guilleminite, Ba[(UO 2 ) 3 (SeO 3 ) 2 O 2 ]⋅3H 2 O, and marthozite, Cu[(UO 2 ) 3 (SeO 3 ) 2 O 2 ](H 2 O) 8 . Sr 2+  cations and H 2 O groups occur between the layers. In contrast, the structure of type 2 contains one-dimensional  1  ∞ [UO 2 (SeO 3 ) 2 ] 2-  ribbons with Sr 2+  cations residing between them. This compound is isostructural with its Ca 2+ -containing analog.

Hydrothermal synthesis and crystal chemistry of the new strontium uranyl selenites, Sr[(UO 2 ) 3 (SeO 3 ) 2 O 2 ]⋅ 4 H 2 O and Sr[UO 2 (SeO 3 ) 2 ]