CoSb(PO4)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2); one O(6); two O(10,10); and two O(12,12) atoms to form distorted CoO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-52°. In the second Co site, Co(2) is bonded to one O(1); one O(5); two O(11,11); and two O(9,9) atoms to form distorted CoO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-55°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(3); one O(8); two O(10,10); and two O(11,11) atoms to form SbO6 octahedra that share corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-50°. In the second Sb site, Sb(2) is bonded to one O(4); one O(7); two O(12,12); and two O(9,9) atoms to form SbO6 octahedra that share corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-55°. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(2); one O(3); and two O(9,9) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, and  an edgeedge with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-51°. In the second P site, P(2) is bonded to one O(1); one O(4); and two O(10,10) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-59°. In the third P site, P(3) is bonded to one O(6); one O(7); and two O(11,11) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, and  an edgeedge with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. In the fourth P site, P(4) is bonded to one O(5); one O(8); and two O(12,12) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and  an edgeedge with one Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-62°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Co(2) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Co(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Sb(2) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Co(2) and one P(4) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Sb(1) and one P(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Co(2), one Sb(2), and one P(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(1), and one P(2) atom. In the eleventh O site, O(9) is bonded in a 3-coordinate geometry to one Co(2), one Sb(2), and one P(1) atom. In the twelfth O site, O(10) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(1), and one P(2) atom. In the thirteenth O site, O(11) is bonded in a 3-coordinate geometry to one Co(2), one Sb(1), and one P(3) atom. In the fourteenth O site, O(12) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(2), and one P(4) atom. In the fifteenth O site, O(11) is bonded in a 3-coordinate geometry to one Co(2), one Sb(1), and one P(3) atom. In the sixteenth O site, O(12) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(2), and one P(4) atom.
CoSb(PO4)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2); one O(6); two O(10,10); and two O(12,12) atoms to form distorted CoO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-52°. The Co(1)-O(2) bond length is 1.99 Å. The Co(1)-O(6) bond length is 1.98 Å. Both Co(1)-O(10,10) bond lengths are 2.24 Å. Both Co(1)-O(12,12) bond lengths are 2.24 Å. In the second Co site, Co(2) is bonded to one O(1); one O(5); two O(11,11); and two O(9,9) atoms to form distorted CoO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-55°. The Co(2)-O(1) bond length is 2.03 Å. The Co(2)-O(5) bond length is 2.07 Å. Both Co(2)-O(11,11) bond lengths are 2.43 Å. Both Co(2)-O(9,9) bond lengths are 2.05 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(3); one O(8); two O(10,10); and two O(11,11) atoms to form SbO6 octahedra that share corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-50°. The Sb(1)-O(3) bond length is 1.97 Å. The Sb(1)-O(8) bond length is 1.99 Å. Both Sb(1)-O(10,10) bond lengths are 2.08 Å. Both Sb(1)-O(11,11) bond lengths are 2.08 Å. In the second Sb site, Sb(2) is bonded to one O(4); one O(7); two O(12,12); and two O(9,9) atoms to form SbO6 octahedra that share corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-55°. The Sb(2)-O(4) bond length is 2.18 Å. The Sb(2)-O(7) bond length is 2.28 Å. Both Sb(2)-O(12,12) bond lengths are 2.26 Å. There is one shorter (2.38 Å) and one longer (2.39 Å) Sb(2)-O(9,9) bond length. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(2); one O(3); and two O(9,9) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, and  an edgeedge with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-51°. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(3) bond length is 1.59 Å. Both P(1)-O(9,9) bond lengths are 1.56 Å. In the second P site, P(2) is bonded to one O(1); one O(4); and two O(10,10) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-59°. The P(2)-O(1) bond length is 1.50 Å. The P(2)-O(4) bond length is 1.52 Å. Both P(2)-O(10,10) bond lengths are 1.62 Å. In the third P site, P(3) is bonded to one O(6); one O(7); and two O(11,11) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, and  an edgeedge with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. The P(3)-O(6) bond length is 1.51 Å. The P(3)-O(7) bond length is 1.52 Å. Both P(3)-O(11,11) bond lengths are 1.62 Å. In the fourth P site, P(4) is bonded to one O(5); one O(8); and two O(12,12) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and  an edgeedge with one Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-62°. The P(4)-O(5) bond length is 1.51 Å. The P(4)-O(8) bond length is 1.59 Å. Both P(4)-O(12,12) bond lengths are 1.57 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Co(2) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Co(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Sb(2) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Co(2) and one P(4) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Sb(1) and one P(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Co(2), one Sb(2), and one P(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(1), and one P(2) atom. In the eleventh O site, O(9) is bonded in a 3-coordinate geometry to one Co(2), one Sb(2), and one P(1) atom. In the twelfth O site, O(10) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(1), and one P(2) atom. In the thirteenth O site, O(11) is bonded in a 3-coordinate geometry to one Co(2), one Sb(1), and one P(3) atom. In the fourteenth O site, O(12) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(2), and one P(4) atom. In the fifteenth O site, O(11) is bonded in a 3-coordinate geometry to one Co(2), one Sb(1), and one P(3) atom. In the sixteenth O site, O(12) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(2), and one P(4) atom.