SrCo2(AsO4)2 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(15), one O(16), one O(6), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(14), one O(15), one O(16), one O(5), one O(7), and one O(9) atom. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(10), one O(4), one O(5), one O(6), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra,  a cornercorner with one As(4)O4 tetrahedra,  an edgeedge with one Co(3)O6 octahedra, and  an edgeedge with one As(2)O4 tetrahedra. In the second Co site, Co(2) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(15), one O(4), and one O(7) atom. In the third Co site, Co(3) is bonded to one O(2), one O(3), one O(5), one O(6), one O(7), and one O(9) atom to form CoO6 octahedra that share corners with two equivalent Co(4)O5 square pyramids,  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra,  a cornercorner with one As(4)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one As(1)O4 tetrahedra. In the fourth Co site, Co(4) is bonded to one O(12), one O(16), one O(2), one O(3), and one O(8) atom to form distorted CoO5 square pyramids that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra,  a cornercorner with one As(4)O4 tetrahedra, and  an edgeedge with one As(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 58-69°. There are four inequivalent As sites. In the first As site, As(1) is bonded to one O(13), one O(3), one O(5), and one O(7) atom to form AsO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O5 square pyramid, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-61°. In the second As site, As(2) is bonded to one O(14), one O(4), one O(6), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O5 square pyramid, and  an edgeedge with one Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-61°. In the third As site, As(3) is bonded to one O(1), one O(11), one O(15), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-60°. In the fourth As site, As(4) is bonded to one O(10), one O(12), one O(16), and one O(2) atom to form AsO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O5 square pyramid, and  an edgeedge with one Co(4)O5 square pyramid. The corner-sharing octahedral tilt angles range from 56-60°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Co(1), one Co(2), and one As(3) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Co(3), one Co(4), and one As(4) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Co(3), one Co(4), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Co(1), one Co(2), and one As(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sr(2), one Co(1), one Co(3), and one As(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Co(1), one Co(3), and one As(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(2), one Co(2), one Co(3), and one As(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Co(1), one Co(4), and one As(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sr(2), one Co(3), and one As(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(1), one Co(1), and one As(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Sr(1), one Co(2), and one As(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Sr(2), one Co(4), and one As(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one As(1) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one As(2) atom. In the fifteenth O site, O(15) is bonded to one Sr(1), one Sr(2), one Co(2), and one As(3) atom to form distorted edge-sharing OSr2CoAs trigonal pyramids. In the sixteenth O site, O(16) is bonded to one Sr(1), one Sr(2), one Co(4), and one As(4) atom to form distorted edge-sharing OSr2CoAs trigonal pyramids.
SrCo2(AsO4)2 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(15), one O(16), one O(6), and one O(8) atom. The Sr(1)-O(10) bond length is 2.60 Å. The Sr(1)-O(11) bond length is 2.66 Å. The Sr(1)-O(13) bond length is 2.59 Å. The Sr(1)-O(14) bond length is 2.75 Å. The Sr(1)-O(15) bond length is 2.55 Å. The Sr(1)-O(16) bond length is 2.75 Å. The Sr(1)-O(6) bond length is 3.03 Å. The Sr(1)-O(8) bond length is 2.71 Å. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(14), one O(15), one O(16), one O(5), one O(7), and one O(9) atom. The Sr(2)-O(12) bond length is 2.66 Å. The Sr(2)-O(13) bond length is 2.75 Å. The Sr(2)-O(14) bond length is 2.59 Å. The Sr(2)-O(15) bond length is 2.75 Å. The Sr(2)-O(16) bond length is 2.55 Å. The Sr(2)-O(5) bond length is 3.02 Å. The Sr(2)-O(7) bond length is 2.71 Å. The Sr(2)-O(9) bond length is 2.59 Å. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(10), one O(4), one O(5), one O(6), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra,  a cornercorner with one As(4)O4 tetrahedra,  an edgeedge with one Co(3)O6 octahedra, and  an edgeedge with one As(2)O4 tetrahedra. The Co(1)-O(1) bond length is 2.01 Å. The Co(1)-O(10) bond length is 2.04 Å. The Co(1)-O(4) bond length is 2.26 Å. The Co(1)-O(5) bond length is 2.14 Å. The Co(1)-O(6) bond length is 2.18 Å. The Co(1)-O(8) bond length is 2.16 Å. In the second Co site, Co(2) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(15), one O(4), and one O(7) atom. The Co(2)-O(1) bond length is 2.03 Å. The Co(2)-O(11) bond length is 2.01 Å. The Co(2)-O(15) bond length is 2.49 Å. The Co(2)-O(4) bond length is 2.03 Å. The Co(2)-O(7) bond length is 2.03 Å. In the third Co site, Co(3) is bonded to one O(2), one O(3), one O(5), one O(6), one O(7), and one O(9) atom to form CoO6 octahedra that share corners with two equivalent Co(4)O5 square pyramids,  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra,  a cornercorner with one As(4)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one As(1)O4 tetrahedra. The Co(3)-O(2) bond length is 2.01 Å. The Co(3)-O(3) bond length is 2.25 Å. The Co(3)-O(5) bond length is 2.17 Å. The Co(3)-O(6) bond length is 2.14 Å. The Co(3)-O(7) bond length is 2.17 Å. The Co(3)-O(9) bond length is 2.04 Å. In the fourth Co site, Co(4) is bonded to one O(12), one O(16), one O(2), one O(3), and one O(8) atom to form distorted CoO5 square pyramids that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra,  a cornercorner with one As(4)O4 tetrahedra, and  an edgeedge with one As(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 58-69°. The Co(4)-O(12) bond length is 2.01 Å. The Co(4)-O(16) bond length is 2.48 Å. The Co(4)-O(2) bond length is 2.03 Å. The Co(4)-O(3) bond length is 2.03 Å. The Co(4)-O(8) bond length is 2.03 Å. There are four inequivalent As sites. In the first As site, As(1) is bonded to one O(13), one O(3), one O(5), and one O(7) atom to form AsO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O5 square pyramid, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-61°. The As(1)-O(13) bond length is 1.69 Å. The As(1)-O(3) bond length is 1.74 Å. The As(1)-O(5) bond length is 1.74 Å. The As(1)-O(7) bond length is 1.76 Å. In the second As site, As(2) is bonded to one O(14), one O(4), one O(6), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O5 square pyramid, and  an edgeedge with one Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-61°. The As(2)-O(14) bond length is 1.69 Å. The As(2)-O(4) bond length is 1.74 Å. The As(2)-O(6) bond length is 1.74 Å. The As(2)-O(8) bond length is 1.76 Å. In the third As site, As(3) is bonded to one O(1), one O(11), one O(15), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra and  a cornercorner with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-60°. The As(3)-O(1) bond length is 1.75 Å. The As(3)-O(11) bond length is 1.73 Å. The As(3)-O(15) bond length is 1.72 Å. The As(3)-O(9) bond length is 1.71 Å. In the fourth As site, As(4) is bonded to one O(10), one O(12), one O(16), and one O(2) atom to form AsO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O5 square pyramid, and  an edgeedge with one Co(4)O5 square pyramid. The corner-sharing octahedral tilt angles range from 56-60°. The As(4)-O(10) bond length is 1.71 Å. The As(4)-O(12) bond length is 1.73 Å. The As(4)-O(16) bond length is 1.72 Å. The As(4)-O(2) bond length is 1.75 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Co(1), one Co(2), and one As(3) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Co(3), one Co(4), and one As(4) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Co(3), one Co(4), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Co(1), one Co(2), and one As(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sr(2), one Co(1), one Co(3), and one As(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Co(1), one Co(3), and one As(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(2), one Co(2), one Co(3), and one As(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Co(1), one Co(4), and one As(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sr(2), one Co(3), and one As(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(1), one Co(1), and one As(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Sr(1), one Co(2), and one As(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Sr(2), one Co(4), and one As(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one As(1) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one As(2) atom. In the fifteenth O site, O(15) is bonded to one Sr(1), one Sr(2), one Co(2), and one As(3) atom to form distorted edge-sharing OSr2CoAs trigonal pyramids. In the sixteenth O site, O(16) is bonded to one Sr(1), one Sr(2), one Co(4), and one As(4) atom to form distorted edge-sharing OSr2CoAs trigonal pyramids.