Co2ZnO5 crystallizes in the triclinic P1 space group. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(2), one O(4), and two equivalent O(3) atoms to form a mixture of edge and corner-sharing CoO5 trigonal bipyramids. In the second Co site, Co(2) is bonded to one O(1), one O(3), one O(9), and two equivalent O(4) atoms to form a mixture of edge and corner-sharing CoO5 trigonal bipyramids. In the third Co site, Co(3) is bonded to one O(1), one O(5), one O(8), and two equivalent O(6) atoms to form a mixture of edge and corner-sharing CoO5 trigonal bipyramids. In the fourth Co site, Co(4) is bonded to one O(2), one O(6), one O(7), and two equivalent O(5) atoms to form a mixture of edge and corner-sharing CoO5 trigonal bipyramids. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(10), two equivalent O(2), and two equivalent O(7) atoms. In the second Zn site, Zn(2) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(8), and two equivalent O(9) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Co(2), one Co(3), and two equivalent Zn(2) atoms to form distorted corner-sharing OZn2Co2 tetrahedra. In the second O site, O(2) is bonded to one Co(1), one Co(4), and two equivalent Zn(1) atoms to form corner-sharing OZn2Co2 tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Co(2), two equivalent Co(1), and one Zn(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Co(1), two equivalent Co(2), and one Zn(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Co(3), two equivalent Co(4), and one Zn(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Co(4), two equivalent Co(3), and one Zn(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Co(4) and two equivalent Zn(1) atoms. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Co(3) and two equivalent Zn(2) atoms. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Co(2) and two equivalent Zn(2) atoms. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Co(1) and two equivalent Zn(1) atoms.
Co2ZnO5 crystallizes in the triclinic P1 space group. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(2), one O(4), and two equivalent O(3) atoms to form a mixture of edge and corner-sharing CoO5 trigonal bipyramids. The Co(1)-O(10) bond length is 1.71 Å. The Co(1)-O(2) bond length is 1.90 Å. The Co(1)-O(4) bond length is 1.90 Å. There is one shorter (1.91 Å) and one longer (1.93 Å) Co(1)-O(3) bond length. In the second Co site, Co(2) is bonded to one O(1), one O(3), one O(9), and two equivalent O(4) atoms to form a mixture of edge and corner-sharing CoO5 trigonal bipyramids. The Co(2)-O(1) bond length is 1.89 Å. The Co(2)-O(3) bond length is 1.90 Å. The Co(2)-O(9) bond length is 1.71 Å. There is one shorter (1.91 Å) and one longer (1.92 Å) Co(2)-O(4) bond length. In the third Co site, Co(3) is bonded to one O(1), one O(5), one O(8), and two equivalent O(6) atoms to form a mixture of edge and corner-sharing CoO5 trigonal bipyramids. The Co(3)-O(1) bond length is 1.89 Å. The Co(3)-O(5) bond length is 1.89 Å. The Co(3)-O(8) bond length is 1.71 Å. There is one shorter (1.92 Å) and one longer (1.93 Å) Co(3)-O(6) bond length. In the fourth Co site, Co(4) is bonded to one O(2), one O(6), one O(7), and two equivalent O(5) atoms to form a mixture of edge and corner-sharing CoO5 trigonal bipyramids. The Co(4)-O(2) bond length is 1.90 Å. The Co(4)-O(6) bond length is 1.90 Å. The Co(4)-O(7) bond length is 1.70 Å. Both Co(4)-O(5) bond lengths are 1.92 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(10), two equivalent O(2), and two equivalent O(7) atoms. The Zn(1)-O(3) bond length is 2.53 Å. The Zn(1)-O(5) bond length is 2.51 Å. Both Zn(1)-O(10) bond lengths are 2.21 Å. There is one shorter (2.18 Å) and one longer (2.19 Å) Zn(1)-O(2) bond length. Both Zn(1)-O(7) bond lengths are 2.25 Å. In the second Zn site, Zn(2) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(8), and two equivalent O(9) atoms. The Zn(2)-O(4) bond length is 2.54 Å. The Zn(2)-O(6) bond length is 2.46 Å. Both Zn(2)-O(1) bond lengths are 2.19 Å. Both Zn(2)-O(8) bond lengths are 2.23 Å. Both Zn(2)-O(9) bond lengths are 2.22 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Co(2), one Co(3), and two equivalent Zn(2) atoms to form distorted corner-sharing OZn2Co2 tetrahedra. In the second O site, O(2) is bonded to one Co(1), one Co(4), and two equivalent Zn(1) atoms to form corner-sharing OZn2Co2 tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Co(2), two equivalent Co(1), and one Zn(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Co(1), two equivalent Co(2), and one Zn(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Co(3), two equivalent Co(4), and one Zn(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Co(4), two equivalent Co(3), and one Zn(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Co(4) and two equivalent Zn(1) atoms. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Co(3) and two equivalent Zn(2) atoms. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Co(2) and two equivalent Zn(2) atoms. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Co(1) and two equivalent Zn(1) atoms.