Pb2P2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(11), one O(13), and two equivalent O(8) atoms. In the second Pb site, Pb(2) is bonded in a 4-coordinate geometry to one O(2), one O(3), one O(6), and one O(7) atom. In the third Pb site, Pb(3) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(7) atom. In the fourth Pb site, Pb(4) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(14), one O(5), one O(8), and one O(9) atom. There are four 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(4) atom to form corner-sharing PO4 tetrahedra. 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 corner-sharing PO4 tetrahedra. In the third P site, P(3) is bonded to one O(12), one O(13), one O(14), and one O(8) atom to form corner-sharing PO4 tetrahedra. In the fourth P site, P(4) is bonded to one O(10), one O(11), one O(12), and one O(9) atom to form corner-sharing PO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Pb(1), one Pb(3), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Pb(3), one Pb(4), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Pb(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Pb(4), two equivalent Pb(1), and one P(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Pb(4) and one P(4) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(4), and one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(4), and one P(4) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one P(3) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Pb(1) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Pb(4) and one P(3) atom.
Pb2P2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(11), one O(13), and two equivalent O(8) atoms. The Pb(1)-O(1) bond length is 2.64 Å. The Pb(1)-O(10) bond length is 2.71 Å. The Pb(1)-O(11) bond length is 2.53 Å. The Pb(1)-O(13) bond length is 2.50 Å. There is one shorter (2.49 Å) and one longer (2.60 Å) Pb(1)-O(8) bond length. In the second Pb site, Pb(2) is bonded in a 4-coordinate geometry to one O(2), one O(3), one O(6), and one O(7) atom. The Pb(2)-O(2) bond length is 2.54 Å. The Pb(2)-O(3) bond length is 2.68 Å. The Pb(2)-O(6) bond length is 2.43 Å. The Pb(2)-O(7) bond length is 2.53 Å. In the third Pb site, Pb(3) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(7) atom. The Pb(3)-O(1) bond length is 2.63 Å. The Pb(3)-O(2) bond length is 2.45 Å. The Pb(3)-O(3) bond length is 2.50 Å. The Pb(3)-O(5) bond length is 2.61 Å. The Pb(3)-O(7) bond length is 2.63 Å. In the fourth Pb site, Pb(4) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(14), one O(5), one O(8), and one O(9) atom. The Pb(4)-O(10) bond length is 2.52 Å. The Pb(4)-O(11) bond length is 2.49 Å. The Pb(4)-O(14) bond length is 2.49 Å. The Pb(4)-O(5) bond length is 2.58 Å. The Pb(4)-O(8) bond length is 2.77 Å. The Pb(4)-O(9) bond length is 2.57 Å. There are four 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(4) atom to form corner-sharing PO4 tetrahedra. The P(1)-O(1) bond length is 1.51 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(4) bond length is 1.63 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 corner-sharing PO4 tetrahedra. The P(2)-O(4) bond length is 1.62 Å. The P(2)-O(5) bond length is 1.53 Å. The P(2)-O(6) bond length is 1.50 Å. The P(2)-O(7) bond length is 1.53 Å. In the third P site, P(3) is bonded to one O(12), one O(13), one O(14), and one O(8) atom to form corner-sharing PO4 tetrahedra. The P(3)-O(12) bond length is 1.62 Å. The P(3)-O(13) bond length is 1.50 Å. The P(3)-O(14) bond length is 1.53 Å. The P(3)-O(8) bond length is 1.53 Å. In the fourth P site, P(4) is bonded to one O(10), one O(11), one O(12), and one O(9) atom to form corner-sharing PO4 tetrahedra. The P(4)-O(10) bond length is 1.53 Å. The P(4)-O(11) bond length is 1.52 Å. The P(4)-O(12) bond length is 1.63 Å. The P(4)-O(9) bond length is 1.51 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Pb(1), one Pb(3), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Pb(3), one Pb(4), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Pb(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Pb(4), two equivalent Pb(1), and one P(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Pb(4) and one P(4) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(4), and one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(4), and one P(4) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one P(3) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Pb(1) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Pb(4) and one P(3) atom.