Pb7(O4Cl)2 crystallizes in the monoclinic P2_1 space group. There are seven inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted trigonal bipyramidal geometry to one O(1), one O(2), one O(3), one O(4), and one Cl(2) atom. In the second Pb site, Pb(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the third Pb site, Pb(3) is bonded in a distorted T-shaped geometry to one O(3), one O(4), and one O(6) atom. In the fourth Pb site, Pb(4) is bonded in a distorted T-shaped geometry to one O(3), one O(4), and one O(5) atom. In the fifth Pb site, Pb(5) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(7), one O(8), and one Cl(1) atom. In the sixth Pb site, Pb(6) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(7), one O(8), and one Cl(1) atom. In the seventh Pb site, Pb(7) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a distorted T-shaped geometry to one Pb(5), one Pb(6), and one Pb(7) atom. In the second O site, O(1) is bonded to one Pb(1), one Pb(2), one Pb(5), and one Pb(6) atom to form a mixture of distorted corner and edge-sharing OPb4 tetrahedra. In the third O site, O(2) is bonded to one Pb(1), one Pb(2), one Pb(5), and one Pb(6) atom to form a mixture of distorted corner and edge-sharing OPb4 tetrahedra. In the fourth O site, O(3) is bonded to one Pb(1), one Pb(2), one Pb(3), and one Pb(4) atom to form a mixture of distorted corner and edge-sharing OPb4 tetrahedra. In the fifth O site, O(4) is bonded to one Pb(1), one Pb(2), one Pb(3), and one Pb(4) atom to form a mixture of corner and edge-sharing OPb4 tetrahedra. In the sixth O site, O(5) is bonded in a bent 120 degrees geometry to one Pb(4) and one Pb(7) atom. In the seventh O site, O(6) is bonded in a water-like geometry to one Pb(3) and one Pb(7) atom. In the eighth O site, O(7) is bonded in a 3-coordinate geometry to one Pb(5), one Pb(6), and one Pb(7) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a water-like geometry to one Pb(5) and one Pb(6) atom. In the second Cl site, Cl(2) is bonded in a distorted single-bond geometry to one Pb(1) atom.
Pb7(O4Cl)2 crystallizes in the monoclinic P2_1 space group. There are seven inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted trigonal bipyramidal geometry to one O(1), one O(2), one O(3), one O(4), and one Cl(2) atom. The Pb(1)-O(1) bond length is 2.13 Å. The Pb(1)-O(2) bond length is 2.16 Å. The Pb(1)-O(3) bond length is 2.17 Å. The Pb(1)-O(4) bond length is 2.22 Å. The Pb(1)-Cl(2) bond length is 2.53 Å. In the second Pb site, Pb(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Pb(2)-O(1) bond length is 2.43 Å. The Pb(2)-O(2) bond length is 2.38 Å. The Pb(2)-O(3) bond length is 2.60 Å. The Pb(2)-O(4) bond length is 2.55 Å. In the third Pb site, Pb(3) is bonded in a distorted T-shaped geometry to one O(3), one O(4), and one O(6) atom. The Pb(3)-O(3) bond length is 2.35 Å. The Pb(3)-O(4) bond length is 2.32 Å. The Pb(3)-O(6) bond length is 2.19 Å. In the fourth Pb site, Pb(4) is bonded in a distorted T-shaped geometry to one O(3), one O(4), and one O(5) atom. The Pb(4)-O(3) bond length is 2.47 Å. The Pb(4)-O(4) bond length is 2.33 Å. The Pb(4)-O(5) bond length is 2.20 Å. In the fifth Pb site, Pb(5) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(7), one O(8), and one Cl(1) atom. The Pb(5)-O(1) bond length is 2.70 Å. The Pb(5)-O(2) bond length is 2.26 Å. The Pb(5)-O(7) bond length is 2.71 Å. The Pb(5)-O(8) bond length is 2.39 Å. The Pb(5)-Cl(1) bond length is 2.90 Å. In the sixth Pb site, Pb(6) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(7), one O(8), and one Cl(1) atom. The Pb(6)-O(1) bond length is 2.33 Å. The Pb(6)-O(2) bond length is 2.66 Å. The Pb(6)-O(7) bond length is 2.40 Å. The Pb(6)-O(8) bond length is 2.51 Å. The Pb(6)-Cl(1) bond length is 3.01 Å. In the seventh Pb site, Pb(7) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. The Pb(7)-O(5) bond length is 2.09 Å. The Pb(7)-O(6) bond length is 2.12 Å. The Pb(7)-O(7) bond length is 2.13 Å. The Pb(7)-O(8) bond length is 2.10 Å. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a distorted T-shaped geometry to one Pb(5), one Pb(6), and one Pb(7) atom. In the second O site, O(1) is bonded to one Pb(1), one Pb(2), one Pb(5), and one Pb(6) atom to form a mixture of distorted corner and edge-sharing OPb4 tetrahedra. In the third O site, O(2) is bonded to one Pb(1), one Pb(2), one Pb(5), and one Pb(6) atom to form a mixture of distorted corner and edge-sharing OPb4 tetrahedra. In the fourth O site, O(3) is bonded to one Pb(1), one Pb(2), one Pb(3), and one Pb(4) atom to form a mixture of distorted corner and edge-sharing OPb4 tetrahedra. In the fifth O site, O(4) is bonded to one Pb(1), one Pb(2), one Pb(3), and one Pb(4) atom to form a mixture of corner and edge-sharing OPb4 tetrahedra. In the sixth O site, O(5) is bonded in a bent 120 degrees geometry to one Pb(4) and one Pb(7) atom. In the seventh O site, O(6) is bonded in a water-like geometry to one Pb(3) and one Pb(7) atom. In the eighth O site, O(7) is bonded in a 3-coordinate geometry to one Pb(5), one Pb(6), and one Pb(7) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a water-like geometry to one Pb(5) and one Pb(6) atom. In the second Cl site, Cl(2) is bonded in a distorted single-bond geometry to one Pb(1) atom.