NaCo2H3(SeO5)2 crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(15), one O(17), one O(19), and one O(9) atom. In the second Na site, Na(2) is bonded to one O(10), one O(12), one O(14), one O(16), one O(18), and one O(20) atom to form distorted NaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(4)O6 octahedra,  a cornercorner with one Se(1)O4 tetrahedra,  a cornercorner with one Se(3)O4 tetrahedra, corners with two equivalent Se(2)O4 tetrahedra, and corners with two equivalent Se(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 69-71°. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(16), one O(19), one O(2), one O(3), one O(6), and one O(7) atom to form CoO6 octahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Se(1)O4 tetrahedra,  a cornercorner with one Se(2)O4 tetrahedra,  a cornercorner with one Se(3)O4 tetrahedra,  a cornercorner with one Se(4)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles are 69°. In the second Co site, Co(2) is bonded to one O(1), one O(13), one O(17), one O(3), one O(6), and one O(8) atom to form CoO6 octahedra that share corners with two equivalent Se(1)O4 tetrahedra, corners with two equivalent Se(3)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. In the third Co site, Co(3) is bonded to one O(1), one O(15), one O(20), one O(4), one O(5), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Se(1)O4 tetrahedra,  a cornercorner with one Se(2)O4 tetrahedra,  a cornercorner with one Se(3)O4 tetrahedra,  a cornercorner with one Se(4)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles are 69°. In the fourth Co site, Co(4) is bonded to one O(14), one O(18), one O(2), one O(4), one O(5), and one O(7) atom to form CoO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Se(2)O4 tetrahedra, corners with two equivalent Se(4)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 70-71°. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(7) and one O(9) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(8) atom. In the fifth H site, H(5) is bonded in a linear geometry to one O(6) and one O(7) atom. In the sixth H site, H(6) is bonded in a linear geometry to one O(5) and one O(8) atom. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to one O(1), one O(13), one O(16), and one O(9) atom to form SeO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, and corners with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-59°. In the second Se site, Se(2) is bonded to one O(10), one O(14), one O(15), and one O(2) atom to form SeO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, and corners with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-70°. In the third Se site, Se(3) is bonded to one O(11), one O(17), one O(20), and one O(3) atom to form SeO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, and corners with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. In the fourth Se site, Se(4) is bonded to one O(12), one O(18), one O(19), and one O(4) atom to form SeO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, and corners with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-69°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Co(2), one Co(3), and one Se(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Co(1), one Co(4), and one Se(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one Se(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Co(3), one Co(4), and one Se(4) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Co(3), one Co(4), one H(1), and one H(6) atom. In the sixth O site, O(6) is bonded to one Co(1), one Co(2), one H(2), and one H(5) atom to form distorted corner-sharing OCo2H2 tetrahedra. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Co(1), one Co(4), one H(3), and one H(5) atom. In the eighth O site, O(8) is bonded to one Co(2), one Co(3), one H(4), and one H(6) atom to form distorted corner-sharing OCo2H2 tetrahedra. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(1), one H(3), and one Se(1) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one Na(2) and one Se(2) atom. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Na(1) and one Se(3) atom. In the twelfth O site, O(12) is bonded in a water-like geometry to one Na(2) and one Se(4) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Na(1), one Co(2), and one Se(1) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Na(2), one Co(4), and one Se(2) atom. In the fifteenth O site, O(15) is bonded in a trigonal planar geometry to one Na(1), one Co(3), and one Se(2) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Na(2), one Co(1), and one Se(1) atom. In the seventeenth O site, O(17) is bonded in a trigonal planar geometry to one Na(1), one Co(2), and one Se(3) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Na(2), one Co(4), and one Se(4) atom. In the nineteenth O site, O(19) is bonded in a trigonal planar geometry to one Na(1), one Co(1), and one Se(4) atom. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one Na(2), one Co(3), and one Se(3) atom.
NaCo2H3(SeO5)2 crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(15), one O(17), one O(19), and one O(9) atom. The Na(1)-O(11) bond length is 2.46 Å. The Na(1)-O(13) bond length is 2.58 Å. The Na(1)-O(15) bond length is 2.62 Å. The Na(1)-O(17) bond length is 2.59 Å. The Na(1)-O(19) bond length is 2.60 Å. The Na(1)-O(9) bond length is 2.46 Å. In the second Na site, Na(2) is bonded to one O(10), one O(12), one O(14), one O(16), one O(18), and one O(20) atom to form distorted NaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(4)O6 octahedra,  a cornercorner with one Se(1)O4 tetrahedra,  a cornercorner with one Se(3)O4 tetrahedra, corners with two equivalent Se(2)O4 tetrahedra, and corners with two equivalent Se(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 69-71°. The Na(2)-O(10) bond length is 2.44 Å. The Na(2)-O(12) bond length is 2.43 Å. The Na(2)-O(14) bond length is 2.63 Å. The Na(2)-O(16) bond length is 2.59 Å. The Na(2)-O(18) bond length is 2.63 Å. The Na(2)-O(20) bond length is 2.61 Å. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(16), one O(19), one O(2), one O(3), one O(6), and one O(7) atom to form CoO6 octahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Se(1)O4 tetrahedra,  a cornercorner with one Se(2)O4 tetrahedra,  a cornercorner with one Se(3)O4 tetrahedra,  a cornercorner with one Se(4)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles are 69°. The Co(1)-O(16) bond length is 2.13 Å. The Co(1)-O(19) bond length is 2.14 Å. The Co(1)-O(2) bond length is 2.21 Å. The Co(1)-O(3) bond length is 2.16 Å. The Co(1)-O(6) bond length is 2.01 Å. The Co(1)-O(7) bond length is 2.09 Å. In the second Co site, Co(2) is bonded to one O(1), one O(13), one O(17), one O(3), one O(6), and one O(8) atom to form CoO6 octahedra that share corners with two equivalent Se(1)O4 tetrahedra, corners with two equivalent Se(3)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The Co(2)-O(1) bond length is 2.18 Å. The Co(2)-O(13) bond length is 2.13 Å. The Co(2)-O(17) bond length is 2.13 Å. The Co(2)-O(3) bond length is 2.19 Å. The Co(2)-O(6) bond length is 2.05 Å. The Co(2)-O(8) bond length is 2.05 Å. In the third Co site, Co(3) is bonded to one O(1), one O(15), one O(20), one O(4), one O(5), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Se(1)O4 tetrahedra,  a cornercorner with one Se(2)O4 tetrahedra,  a cornercorner with one Se(3)O4 tetrahedra,  a cornercorner with one Se(4)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles are 69°. The Co(3)-O(1) bond length is 2.18 Å. The Co(3)-O(15) bond length is 2.11 Å. The Co(3)-O(20) bond length is 2.10 Å. The Co(3)-O(4) bond length is 2.22 Å. The Co(3)-O(5) bond length is 2.09 Å. The Co(3)-O(8) bond length is 2.03 Å. In the fourth Co site, Co(4) is bonded to one O(14), one O(18), one O(2), one O(4), one O(5), and one O(7) atom to form CoO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Se(2)O4 tetrahedra, corners with two equivalent Se(4)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 70-71°. The Co(4)-O(14) bond length is 2.11 Å. The Co(4)-O(18) bond length is 2.11 Å. The Co(4)-O(2) bond length is 2.12 Å. The Co(4)-O(4) bond length is 2.11 Å. The Co(4)-O(5) bond length is 2.12 Å. The Co(4)-O(7) bond length is 2.13 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. The H(2)-O(6) bond length is 0.98 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(7) and one O(9) atom. The H(3)-O(7) bond length is 0.99 Å. The H(3)-O(9) bond length is 1.78 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(8) atom. The H(4)-O(8) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a linear geometry to one O(6) and one O(7) atom. The H(5)-O(6) bond length is 1.40 Å. The H(5)-O(7) bond length is 1.09 Å. In the sixth H site, H(6) is bonded in a linear geometry to one O(5) and one O(8) atom. The H(6)-O(5) bond length is 1.10 Å. The H(6)-O(8) bond length is 1.37 Å. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to one O(1), one O(13), one O(16), and one O(9) atom to form SeO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, and corners with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-59°. The Se(1)-O(1) bond length is 1.71 Å. The Se(1)-O(13) bond length is 1.69 Å. The Se(1)-O(16) bond length is 1.68 Å. The Se(1)-O(9) bond length is 1.65 Å. In the second Se site, Se(2) is bonded to one O(10), one O(14), one O(15), and one O(2) atom to form SeO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, and corners with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-70°. The Se(2)-O(10) bond length is 1.64 Å. The Se(2)-O(14) bond length is 1.68 Å. The Se(2)-O(15) bond length is 1.69 Å. The Se(2)-O(2) bond length is 1.73 Å. In the third Se site, Se(3) is bonded to one O(11), one O(17), one O(20), and one O(3) atom to form SeO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, and corners with two equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. The Se(3)-O(11) bond length is 1.65 Å. The Se(3)-O(17) bond length is 1.68 Å. The Se(3)-O(20) bond length is 1.69 Å. The Se(3)-O(3) bond length is 1.71 Å. In the fourth Se site, Se(4) is bonded to one O(12), one O(18), one O(19), and one O(4) atom to form SeO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, and corners with two equivalent Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-69°. The Se(4)-O(12) bond length is 1.64 Å. The Se(4)-O(18) bond length is 1.68 Å. The Se(4)-O(19) bond length is 1.68 Å. The Se(4)-O(4) bond length is 1.73 Å. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Co(2), one Co(3), and one Se(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Co(1), one Co(4), and one Se(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one Se(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Co(3), one Co(4), and one Se(4) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Co(3), one Co(4), one H(1), and one H(6) atom. In the sixth O site, O(6) is bonded to one Co(1), one Co(2), one H(2), and one H(5) atom to form distorted corner-sharing OCo2H2 tetrahedra. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Co(1), one Co(4), one H(3), and one H(5) atom. In the eighth O site, O(8) is bonded to one Co(2), one Co(3), one H(4), and one H(6) atom to form distorted corner-sharing OCo2H2 tetrahedra. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(1), one H(3), and one Se(1) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one Na(2) and one Se(2) atom. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Na(1) and one Se(3) atom. In the twelfth O site, O(12) is bonded in a water-like geometry to one Na(2) and one Se(4) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Na(1), one Co(2), and one Se(1) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Na(2), one Co(4), and one Se(2) atom. In the fifteenth O site, O(15) is bonded in a trigonal planar geometry to one Na(1), one Co(3), and one Se(2) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Na(2), one Co(1), and one Se(1) atom. In the seventeenth O site, O(17) is bonded in a trigonal planar geometry to one Na(1), one Co(2), and one Se(3) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Na(2), one Co(4), and one Se(4) atom. In the nineteenth O site, O(19) is bonded in a trigonal planar geometry to one Na(1), one Co(1), and one Se(4) atom. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one Na(2), one Co(3), and one Se(3) atom.