TiZnP2O7 crystallizes in the triclinic P-1 space group. Ti(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(7) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Zn(1)O5 square pyramid, corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one Zn(1)O5 square pyramid. Zn(1) is bonded to one O(1), one O(3), one O(7), and two equivalent O(4) atoms to form ZnO5 square pyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a cornercorner with one Ti(1)O5 trigonal bipyramid,  an edgeedge with one Zn(1)O5 square pyramid, and  an edgeedge with one Ti(1)O5 trigonal bipyramid. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O5 square pyramids,  a cornercorner with one P(2)O4 tetrahedra, and corners with three equivalent Ti(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Zn(1)O5 square pyramids,  a cornercorner with one P(1)O4 tetrahedra, and corners with two equivalent Ti(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Ti(1), one Zn(1), and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Ti(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ti(1), one Zn(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Zn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Ti(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ti(1), one Zn(1), and one P(2) atom.
TiZnP2O7 crystallizes in the triclinic P-1 space group. Ti(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(7) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Zn(1)O5 square pyramid, corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one Zn(1)O5 square pyramid. The Ti(1)-O(1) bond length is 2.17 Å. The Ti(1)-O(2) bond length is 2.04 Å. The Ti(1)-O(3) bond length is 2.13 Å. The Ti(1)-O(5) bond length is 2.10 Å. The Ti(1)-O(7) bond length is 2.24 Å. Zn(1) is bonded to one O(1), one O(3), one O(7), and two equivalent O(4) atoms to form ZnO5 square pyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a cornercorner with one Ti(1)O5 trigonal bipyramid,  an edgeedge with one Zn(1)O5 square pyramid, and  an edgeedge with one Ti(1)O5 trigonal bipyramid. The Zn(1)-O(1) bond length is 2.10 Å. The Zn(1)-O(3) bond length is 2.14 Å. The Zn(1)-O(7) bond length is 2.16 Å. There is one shorter (2.09 Å) and one longer (2.15 Å) Zn(1)-O(4) bond length. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O5 square pyramids,  a cornercorner with one P(2)O4 tetrahedra, and corners with three equivalent Ti(1)O5 trigonal bipyramids. The P(1)-O(1) bond length is 1.55 Å. The P(1)-O(2) bond length is 1.50 Å. The P(1)-O(3) bond length is 1.55 Å. The P(1)-O(6) bond length is 1.61 Å. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Zn(1)O5 square pyramids,  a cornercorner with one P(1)O4 tetrahedra, and corners with two equivalent Ti(1)O5 trigonal bipyramids. The P(2)-O(4) bond length is 1.55 Å. The P(2)-O(5) bond length is 1.53 Å. The P(2)-O(6) bond length is 1.62 Å. The P(2)-O(7) bond length is 1.54 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Ti(1), one Zn(1), and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Ti(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ti(1), one Zn(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Zn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Ti(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ti(1), one Zn(1), and one P(2) atom.