FeP2(PbO5)2 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. Pb(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(5) atoms. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Fe(1), one Pb(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Pb(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Pb(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1) and two equivalent Pb(1) atoms.
FeP2(PbO5)2 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. Both Fe(1)-O(1) bond lengths are 2.00 Å. Both Fe(1)-O(2) bond lengths are 2.08 Å. Both Fe(1)-O(5) bond lengths are 1.85 Å. Pb(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(5) atoms. The Pb(1)-O(1) bond length is 2.57 Å. The Pb(1)-O(3) bond length is 2.27 Å. The Pb(1)-O(4) bond length is 2.41 Å. There is one shorter (2.42 Å) and one longer (2.64 Å) Pb(1)-O(5) bond length. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. The P(1)-O(1) bond length is 1.57 Å. The P(1)-O(2) bond length is 1.55 Å. The P(1)-O(3) bond length is 1.55 Å. The P(1)-O(4) bond length is 1.56 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Fe(1), one Pb(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Pb(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Pb(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1) and two equivalent Pb(1) atoms.