Sr2CoCu2AlO7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(7), two equivalent O(11), and two equivalent O(13) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(8), two equivalent O(12), and two equivalent O(14) atoms. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(9), two equivalent O(11), and two equivalent O(13) atoms. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(6), two equivalent O(12), and two equivalent O(14) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(11), one O(14), and one O(2) atom to form corner-sharing CoO4 tetrahedra. In the second Co site, Co(2) is bonded to one O(1), one O(12), one O(13), and one O(2) atom to form corner-sharing CoO4 tetrahedra. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one O(13), one O(3), one O(5), one O(7), and one O(9) atom. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(14), one O(4), one O(6), and one O(8) atom. In the third Cu site, Cu(3) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(3), one O(5), one O(7), and one O(9) atom. In the fourth Cu site, Cu(4) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(12), one O(4), one O(6), and one O(8) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted tetrahedral geometry to one O(10), one O(5), one O(6), and one O(9) atom. In the second Al site, Al(2) is bonded in a distorted tetrahedral geometry to one O(3), one O(4), one O(7), and one O(8) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(4), one Co(1), and one Co(2) atom to form distorted corner-sharing OSr2Co2 tetrahedra. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), one Co(1), and one Co(2) atom to form distorted corner-sharing OSr2Co2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), one Cu(2), one Cu(4), and one Al(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Cu(2), one Cu(4), and one Al(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Co(1), and one Cu(3) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Co(2), and one Cu(4) atom. In the thirteenth O site, O(13) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Co(2), and one Cu(1) atom. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Co(1), and one Cu(2) atom.
Sr2CoCu2AlO7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(7), two equivalent O(11), and two equivalent O(13) atoms. The Sr(1)-O(1) bond length is 2.43 Å. The Sr(1)-O(3) bond length is 2.58 Å. The Sr(1)-O(7) bond length is 2.57 Å. There is one shorter (2.55 Å) and one longer (2.95 Å) Sr(1)-O(11) bond length. There is one shorter (2.61 Å) and one longer (2.82 Å) Sr(1)-O(13) bond length. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(8), two equivalent O(12), and two equivalent O(14) atoms. The Sr(2)-O(2) bond length is 2.43 Å. The Sr(2)-O(4) bond length is 2.59 Å. The Sr(2)-O(8) bond length is 2.57 Å. There is one shorter (2.55 Å) and one longer (2.95 Å) Sr(2)-O(12) bond length. There is one shorter (2.62 Å) and one longer (2.81 Å) Sr(2)-O(14) bond length. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(9), two equivalent O(11), and two equivalent O(13) atoms. The Sr(3)-O(2) bond length is 2.43 Å. The Sr(3)-O(5) bond length is 2.59 Å. The Sr(3)-O(9) bond length is 2.57 Å. There is one shorter (2.62 Å) and one longer (2.82 Å) Sr(3)-O(11) bond length. There is one shorter (2.55 Å) and one longer (2.94 Å) Sr(3)-O(13) bond length. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(6), two equivalent O(12), and two equivalent O(14) atoms. The Sr(4)-O(1) bond length is 2.43 Å. The Sr(4)-O(10) bond length is 2.58 Å. The Sr(4)-O(6) bond length is 2.58 Å. There is one shorter (2.62 Å) and one longer (2.81 Å) Sr(4)-O(12) bond length. There is one shorter (2.55 Å) and one longer (2.94 Å) Sr(4)-O(14) bond length. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(11), one O(14), and one O(2) atom to form corner-sharing CoO4 tetrahedra. The Co(1)-O(1) bond length is 1.94 Å. The Co(1)-O(11) bond length is 1.84 Å. The Co(1)-O(14) bond length is 1.84 Å. The Co(1)-O(2) bond length is 1.94 Å. In the second Co site, Co(2) is bonded to one O(1), one O(12), one O(13), and one O(2) atom to form corner-sharing CoO4 tetrahedra. The Co(2)-O(1) bond length is 1.94 Å. The Co(2)-O(12) bond length is 1.84 Å. The Co(2)-O(13) bond length is 1.84 Å. The Co(2)-O(2) bond length is 1.94 Å. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one O(13), one O(3), one O(5), one O(7), and one O(9) atom. The Cu(1)-O(13) bond length is 2.63 Å. The Cu(1)-O(3) bond length is 1.97 Å. The Cu(1)-O(5) bond length is 1.99 Å. The Cu(1)-O(7) bond length is 1.97 Å. The Cu(1)-O(9) bond length is 1.98 Å. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(14), one O(4), one O(6), and one O(8) atom. The Cu(2)-O(10) bond length is 1.98 Å. The Cu(2)-O(14) bond length is 2.62 Å. The Cu(2)-O(4) bond length is 1.97 Å. The Cu(2)-O(6) bond length is 1.99 Å. The Cu(2)-O(8) bond length is 1.97 Å. In the third Cu site, Cu(3) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(3), one O(5), one O(7), and one O(9) atom. The Cu(3)-O(11) bond length is 2.63 Å. The Cu(3)-O(3) bond length is 1.99 Å. The Cu(3)-O(5) bond length is 1.97 Å. The Cu(3)-O(7) bond length is 1.98 Å. The Cu(3)-O(9) bond length is 1.96 Å. In the fourth Cu site, Cu(4) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(12), one O(4), one O(6), and one O(8) atom. The Cu(4)-O(10) bond length is 1.97 Å. The Cu(4)-O(12) bond length is 2.62 Å. The Cu(4)-O(4) bond length is 1.98 Å. The Cu(4)-O(6) bond length is 1.97 Å. The Cu(4)-O(8) bond length is 1.98 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted tetrahedral geometry to one O(10), one O(5), one O(6), and one O(9) atom. The Al(1)-O(10) bond length is 1.84 Å. The Al(1)-O(5) bond length is 1.84 Å. The Al(1)-O(6) bond length is 1.84 Å. The Al(1)-O(9) bond length is 1.83 Å. In the second Al site, Al(2) is bonded in a distorted tetrahedral geometry to one O(3), one O(4), one O(7), and one O(8) atom. The Al(2)-O(3) bond length is 1.84 Å. The Al(2)-O(4) bond length is 1.84 Å. The Al(2)-O(7) bond length is 1.84 Å. The Al(2)-O(8) bond length is 1.84 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(4), one Co(1), and one Co(2) atom to form distorted corner-sharing OSr2Co2 tetrahedra. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), one Co(1), and one Co(2) atom to form distorted corner-sharing OSr2Co2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), one Cu(2), one Cu(4), and one Al(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Cu(2), one Cu(4), and one Al(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Co(1), and one Cu(3) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Co(2), and one Cu(4) atom. In the thirteenth O site, O(13) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Co(2), and one Cu(1) atom. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Co(1), and one Cu(2) atom.