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(14), one O(2), one O(6), and one O(9) atom to form distorted CoO4 tetrahedra that share corners with two equivalent Sb(1)O6 pentagonal pyramids, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. In the second Co site, Co(2) is bonded to one O(1), one O(10), one O(11), one O(15), and one O(5) atom to form CoO5 trigonal bipyramids that share  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Sb(1)O6 pentagonal pyramids,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(11), one O(14), one O(15), one O(3), one O(7), and one O(9) atom to form distorted SbO6 pentagonal pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent Co(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent Co(2)O5 trigonal bipyramids, and  an edgeedge with one P(1)O4 tetrahedra. In the second Sb site, Sb(2) is bonded to one O(10), one O(12), one O(13), one O(16), one O(4), and one O(8) atom to form SbO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra,  a cornercorner with one Co(2)O5 trigonal bipyramid, and  an edgeedge with one P(2)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(2), one O(3), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 pentagonal pyramid, corners with two equivalent Co(1)O4 tetrahedra,  a cornercorner with one Co(2)O5 trigonal bipyramid, and  an edgeedge with one Sb(1)O6 pentagonal pyramid. In the second P site, P(2) is bonded to one O(1), one O(10), one O(12), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Co(2)O5 trigonal bipyramids, and  an edgeedge with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles are 37°. In the third P site, P(3) is bonded to one O(13), one O(15), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Sb(1)O6 pentagonal pyramids, and corners with two equivalent Co(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 49°. In the fourth P site, P(4) is bonded to one O(14), one O(16), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Sb(2)O6 octahedra,  a cornercorner with one Sb(1)O6 pentagonal pyramid, and corners with two equivalent Co(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-52°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Co(2) and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 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 120 degrees geometry to one Co(2) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(1), and one P(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Co(2), one Sb(2), and one P(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Co(2), one Sb(1), and one P(1) atom. In the twelfth O site, O(12) is bonded in a distorted water-like geometry to one Sb(2) and one P(2) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(1), and one P(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Co(2), one Sb(1), and one P(3) atom. In the sixteenth O site, O(16) is bonded in a bent 120 degrees geometry to 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(14), one O(2), one O(6), and one O(9) atom to form distorted CoO4 tetrahedra that share corners with two equivalent Sb(1)O6 pentagonal pyramids, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The Co(1)-O(14) bond length is 2.02 Å. The Co(1)-O(2) bond length is 1.96 Å. The Co(1)-O(6) bond length is 1.96 Å. The Co(1)-O(9) bond length is 2.05 Å. In the second Co site, Co(2) is bonded to one O(1), one O(10), one O(11), one O(15), and one O(5) atom to form CoO5 trigonal bipyramids that share  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Sb(1)O6 pentagonal pyramids,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. The Co(2)-O(1) bond length is 1.98 Å. The Co(2)-O(10) bond length is 2.24 Å. The Co(2)-O(11) bond length is 2.10 Å. The Co(2)-O(15) bond length is 2.05 Å. The Co(2)-O(5) bond length is 2.00 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(11), one O(14), one O(15), one O(3), one O(7), and one O(9) atom to form distorted SbO6 pentagonal pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent Co(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent Co(2)O5 trigonal bipyramids, and  an edgeedge with one P(1)O4 tetrahedra. The Sb(1)-O(11) bond length is 2.20 Å. The Sb(1)-O(14) bond length is 2.61 Å. The Sb(1)-O(15) bond length is 2.55 Å. The Sb(1)-O(3) bond length is 2.18 Å. The Sb(1)-O(7) bond length is 2.30 Å. The Sb(1)-O(9) bond length is 2.25 Å. In the second Sb site, Sb(2) is bonded to one O(10), one O(12), one O(13), one O(16), one O(4), and one O(8) atom to form SbO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra,  a cornercorner with one Co(2)O5 trigonal bipyramid, and  an edgeedge with one P(2)O4 tetrahedra. The Sb(2)-O(10) bond length is 2.10 Å. The Sb(2)-O(12) bond length is 2.04 Å. The Sb(2)-O(13) bond length is 1.97 Å. The Sb(2)-O(16) bond length is 1.99 Å. The Sb(2)-O(4) bond length is 2.03 Å. The Sb(2)-O(8) bond length is 2.00 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(2), one O(3), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 pentagonal pyramid, corners with two equivalent Co(1)O4 tetrahedra,  a cornercorner with one Co(2)O5 trigonal bipyramid, and  an edgeedge with one Sb(1)O6 pentagonal pyramid. The P(1)-O(11) bond length is 1.60 Å. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(9) bond length is 1.60 Å. In the second P site, P(2) is bonded to one O(1), one O(10), one O(12), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Co(2)O5 trigonal bipyramids, and  an edgeedge with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles are 37°. The P(2)-O(1) bond length is 1.50 Å. The P(2)-O(10) bond length is 1.61 Å. The P(2)-O(12) bond length is 1.59 Å. The P(2)-O(4) bond length is 1.56 Å. In the third P site, P(3) is bonded to one O(13), one O(15), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Sb(1)O6 pentagonal pyramids, and corners with two equivalent Co(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 49°. The P(3)-O(13) bond length is 1.63 Å. The P(3)-O(15) bond length is 1.55 Å. The P(3)-O(5) bond length is 1.53 Å. The P(3)-O(7) bond length is 1.53 Å. In the fourth P site, P(4) is bonded to one O(14), one O(16), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Sb(2)O6 octahedra,  a cornercorner with one Sb(1)O6 pentagonal pyramid, and corners with two equivalent Co(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-52°. The P(4)-O(14) bond length is 1.54 Å. The P(4)-O(16) bond length is 1.60 Å. The P(4)-O(6) bond length is 1.51 Å. The P(4)-O(8) bond length is 1.58 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Co(2) and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 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 120 degrees geometry to one Co(2) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(1), and one P(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Co(2), one Sb(2), and one P(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Co(2), one Sb(1), and one P(1) atom. In the twelfth O site, O(12) is bonded in a distorted water-like geometry to one Sb(2) and one P(2) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Co(1), one Sb(1), and one P(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Co(2), one Sb(1), and one P(3) atom. In the sixteenth O site, O(16) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(4) atom.