Hydrothermal Synthesis and Structural Characterization of a Novel Hydroxo Stannate: Sr2Sn(OH)8

A new hydroxo stannate(IV), Sr2Sn(OH)8, has been synthesized by the hydrothermal method. Single-crystal X-ray diffraction shows that this compound crystallizes in the monoclinic space group P21/c with a=6.006(1) Å, b=11.058(2) Å, c=6.129(2) Å, β=112.98(2)°, V=374.8(2) Å3, Z=2, R=0.022 (I>2σ(I)). The structure [Sr(OH)6/3(OH)2/2]2[Sn(OH)6/3] consists of Sn(OH)6 octahedra and Sr(OH)8 triangulated dodecahedra. These Sr(OH)8 and Sn(OH)6 polyhedra form a novel complex 3D packing arrangement that contains channels running along [001], filled with the in-pointing hydrogens of the hydroxo groups.