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Ge(SeO3)2 crystallizes in the cubic Pa-3 space group. The structure is three-dimensional. Ge4+ is bonded in an octahedral geometry to six equivalent O2- atoms. All Ge–O bond lengths are 1.92 Å. Se4+ is bonded in a distorted T-shaped geometry to three equivalent O2- atoms. All Se–O bond lengths are 1.75 Å. O2- is bonded in a bent 120 degrees geometry to one Ge4+ and one Se4+ atom.
Ge(SeO3)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ge4+ is bonded in an octahedral geometry to six O2- atoms. There is four shorter (1.92 Å) and two longer (1.94 Å) Ge–O bond length. Se4+ is bonded in a distorted T-shaped geometry to three O2- atoms. There are a spread of Se–O bond distances ranging from 1.74–1.76 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to one Ge4+ and one Se4+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one Ge4+ and one Se4+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Ge4+ and one Se4+ atom.