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Sn(SeO3)2 crystallizes in the cubic Pa-3 space group. The structure is three-dimensional. Sn4+ is bonded in an octahedral geometry to six equivalent O2- atoms. All Sn–O bond lengths are 2.08 Å. Se4+ is bonded in a distorted trigonal non-coplanar geometry to three equivalent O2- atoms. All Se–O bond lengths are 1.74 Å. O2- is bonded in a bent 120 degrees geometry to one Sn4+ and one Se4+ atom.
Sn(SeO3)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Sn4+ is bonded in an octahedral geometry to six O2- atoms. There are four shorter (2.08 Å) and two longer (2.10 Å) Sn–O bond lengths. Se4+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There is one shorter (1.73 Å) and two longer (1.74 Å) Se–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sn4+ and one Se4+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sn4+ and one Se4+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Sn4+ and one Se4+ atom.