CuBi2(SeO3)4 crystallizes in the monoclinic P2_1/c space group. Cu(1) is bonded in a square co-planar geometry to two equivalent O(5) and two equivalent O(6) atoms. Bi(1) is bonded to one O(2), one O(4), one O(6), two equivalent O(1), and two equivalent O(3) atoms to form distorted corner-sharing BiO7 pentagonal bipyramids. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(5), and one O(6) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Bi(1) and one Se(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Bi(1) and one Se(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Bi(1) and one Se(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Bi(1) and one Se(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cu(1) and one Se(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Cu(1), one Bi(1), and one Se(1) atom.
CuBi2(SeO3)4 crystallizes in the monoclinic P2_1/c space group. Cu(1) is bonded in a square co-planar geometry to two equivalent O(5) and two equivalent O(6) atoms. Both Cu(1)-O(5) bond lengths are 1.96 Å. Both Cu(1)-O(6) bond lengths are 1.92 Å. Bi(1) is bonded to one O(2), one O(4), one O(6), two equivalent O(1), and two equivalent O(3) atoms to form distorted corner-sharing BiO7 pentagonal bipyramids. The Bi(1)-O(2) bond length is 2.35 Å. The Bi(1)-O(4) bond length is 2.44 Å. The Bi(1)-O(6) bond length is 2.67 Å. There is one shorter (2.35 Å) and one longer (2.45 Å) Bi(1)-O(1) bond length. There is one shorter (2.27 Å) and one longer (2.55 Å) Bi(1)-O(3) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(5), and one O(6) atom. The Se(1)-O(1) bond length is 1.74 Å. The Se(1)-O(5) bond length is 1.69 Å. The Se(1)-O(6) bond length is 1.71 Å. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom. The Se(2)-O(2) bond length is 1.73 Å. The Se(2)-O(3) bond length is 1.76 Å. The Se(2)-O(4) bond length is 1.69 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Bi(1) and one Se(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Bi(1) and one Se(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Bi(1) and one Se(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Bi(1) and one Se(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cu(1) and one Se(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Cu(1), one Bi(1), and one Se(1) atom.