MgTi2P2(HO5)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(6), and one O(7) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  an edgeedge with one Ti(1)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-65°. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(8), and one O(9) atom to form TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 46-63°. In the second Ti site, Ti(2) is bonded to one O(1), one O(10), one O(4), one O(5), one O(6), and one O(7) atom to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 46-63°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 30-50°. In the second P site, P(2) is bonded to one O(3), one O(6), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 33-51°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(10) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Mg(1), one Ti(1), one Ti(2), and one H(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Ti(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Ti(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Ti(2) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Ti(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mg(1), one Ti(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one Ti(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Ti(1) and one P(1) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Ti(1) and one P(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Ti(1), one Ti(2), and one H(1) atom.
MgTi2P2(HO5)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(6), and one O(7) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  an edgeedge with one Ti(1)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-65°. The Mg(1)-O(1) bond length is 1.99 Å. The Mg(1)-O(2) bond length is 2.14 Å. The Mg(1)-O(3) bond length is 2.11 Å. The Mg(1)-O(6) bond length is 2.05 Å. The Mg(1)-O(7) bond length is 2.13 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(8), and one O(9) atom to form TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 46-63°. The Ti(1)-O(1) bond length is 2.19 Å. The Ti(1)-O(10) bond length is 1.97 Å. The Ti(1)-O(2) bond length is 2.14 Å. The Ti(1)-O(3) bond length is 2.11 Å. The Ti(1)-O(8) bond length is 2.04 Å. The Ti(1)-O(9) bond length is 2.05 Å. In the second Ti site, Ti(2) is bonded to one O(1), one O(10), one O(4), one O(5), one O(6), and one O(7) atom to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 46-63°. The Ti(2)-O(1) bond length is 2.16 Å. The Ti(2)-O(10) bond length is 1.96 Å. The Ti(2)-O(4) bond length is 1.95 Å. The Ti(2)-O(5) bond length is 1.96 Å. The Ti(2)-O(6) bond length is 2.19 Å. The Ti(2)-O(7) bond length is 2.11 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 30-50°. The P(1)-O(2) bond length is 1.57 Å. The P(1)-O(4) bond length is 1.54 Å. The P(1)-O(5) bond length is 1.55 Å. The P(1)-O(8) bond length is 1.55 Å. In the second P site, P(2) is bonded to one O(3), one O(6), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 33-51°. The P(2)-O(3) bond length is 1.57 Å. The P(2)-O(6) bond length is 1.55 Å. The P(2)-O(7) bond length is 1.56 Å. The P(2)-O(9) bond length is 1.53 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(10) atom. The H(1)-O(10) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. The H(2)-O(1) bond length is 0.99 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Mg(1), one Ti(1), one Ti(2), and one H(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Ti(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Ti(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Ti(2) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Ti(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mg(1), one Ti(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one Ti(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Ti(1) and one P(1) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Ti(1) and one P(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Ti(1), one Ti(2), and one H(1) atom.