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CuGa2 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Cu is bonded in a distorted body-centered cubic geometry to eight equivalent Ga atoms. All Cu–Ga bond lengths are 2.62 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Cu and five equivalent Ga atoms. There are one shorter (2.54 Å) and four longer (2.84 Å) Ga–Ga bond lengths.
CuGa2(SeO3)4 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two CuGa2(SeO3)4 sheets oriented in the (0, 0, 1) direction. Cu2+ is bonded to six O2- atoms to form distorted CuO6 octahedra that share corners with four equivalent GaO6 octahedra. The corner-sharing octahedra tilt angles range from 43–49°. There are a spread of Cu–O bond distances ranging from 2.00–2.48 Å. Ga3+ is bonded to six O2- atoms to form GaO6 octahedra that share corners with two equivalent CuO6 octahedra and corners with two equivalent GaO6 octahedra. The corner-sharing octahedra tilt angles range from 43–49°. There are a spread of Ga–O bond distances ranging from 1.93–2.13 Å. There are two inequivalent Se4+ sites. In the first Se4+ site, Se4+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There is one shorter (1.71 Å) and two longer (1.77 Å) Se–O bond length. In the second Se4+ site, 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 six inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to one Ga3+ and one Se4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ga3+ and one Se4+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Ga3+ and one Se4+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Cu2+, one Ga3+, and one Se4+ atom. In the fifth O2- site, O2- is bonded in a water-like geometry to one Cu2+ and one Se4+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Cu2+, one Ga3+, and one Se4+ atom.