CoH4SeO5 crystallizes in the monoclinic P2_1/c space group. Co(1) is bonded to one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form edge-sharing CoO5 trigonal bipyramids. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. In the second H site, H(2) is bonded in a distorted linear geometry to one O(3) and one O(4) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one O(1) and one O(4) atom. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to one O(1) and one O(5) atom. Se(1) is bonded in a trigonal non-coplanar geometry to one O(2), one O(3), and one O(5) atom. There are five inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to one Co(1), one H(2), and one Se(1) atom. In the second O site, O(4) is bonded in a distorted water-like geometry to one Co(1), one H(2), and one H(3) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to one Co(1), one H(4), and one Se(1) atom. In the fourth O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one H(1), one H(3), and one H(4) atom. In the fifth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Co(1) and one Se(1) atom.
CoH4SeO5 crystallizes in the monoclinic P2_1/c space group. Co(1) is bonded to one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form edge-sharing CoO5 trigonal bipyramids. The Co(1)-O(3) bond length is 2.07 Å. The Co(1)-O(4) bond length is 2.05 Å. The Co(1)-O(5) bond length is 2.10 Å. There is one shorter (2.04 Å) and one longer (2.18 Å) Co(1)-O(2) bond length. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 1.00 Å. In the second H site, H(2) is bonded in a distorted linear geometry to one O(3) and one O(4) atom. The H(2)-O(3) bond length is 1.56 Å. The H(2)-O(4) bond length is 1.02 Å. In the third H site, H(3) is bonded in a distorted single-bond geometry to one O(1) and one O(4) atom. The H(3)-O(1) bond length is 1.55 Å. The H(3)-O(4) bond length is 1.03 Å. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to one O(1) and one O(5) atom. The H(4)-O(1) bond length is 1.00 Å. The H(4)-O(5) bond length is 1.67 Å. Se(1) is bonded in a trigonal non-coplanar geometry to one O(2), one O(3), and one O(5) atom. The Se(1)-O(2) bond length is 1.77 Å. The Se(1)-O(3) bond length is 1.75 Å. The Se(1)-O(5) bond length is 1.73 Å. There are five inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to one Co(1), one H(2), and one Se(1) atom. In the second O site, O(4) is bonded in a distorted water-like geometry to one Co(1), one H(2), and one H(3) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to one Co(1), one H(4), and one Se(1) atom. In the fourth O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one H(1), one H(3), and one H(4) atom. In the fifth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Co(1) and one Se(1) atom.