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Molecular Polyselenide Anions Sandwiched between Cationic Extended Metal Hydroxides: Synthesis and Structures of [Sr2Sn(OH)6(H2O)6]Se4 and [Sr2Sn(OH)6(H2O)5]Se3·H2O

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Abstract

Two new strontium tin hydroxy polyselenides [Sr2Sn(OH)6(H2O)6]Se4 (1) and [Sr2Sn(OH)6(H2O)5]Se3·H2O (2) were synthesized from hydrothermal reactions. Their structures were determined from single-crystal X-ray data measured at 218 K. Compound 1 crystallized in the space group Pequation image with a = 5.935(1), b = 8.440(1), c = 9.464(2) Å, α = 97.292(2)°, β = 104.957(2)°, γ = 110.328(2)°. Compound 2 crystallized also in the space group Pequation image with a = 10.658(2), b = 11.082(2), c = 15.797(2) Å, α = 73.303(4)°, β = 74.942(4)°, γ = 64.627(3)°. Both compounds have structures containing infinite cationic layers of hydrated metal hydroxides built from Sn(OH)6 octahedra and Sr(OH, H2O)n polyhedra. Molecular Se42– and Se32– anions are located in the interlayer spaces of 1 and 2, respectively. The Se42– anions of 1 adopt a flat zigzag conformation with a torsion angle of 0°.

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