Pb2As2O5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(5) atom. In the second Pb site, Pb(2) is bonded in a 5-coordinate geometry to one O(1), one O(4), one O(5), and two equivalent O(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second As site, As(2) is bonded in a distorted trigonal non-coplanar geometry to one O(3), one O(4), and one O(5) atom. There are five inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Pb(1), one Pb(2), and one As(2) atom. In the second O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Pb(1), one Pb(2), and one As(1) atom. In the third O site, O(2) is bonded in a 1-coordinate geometry to one Pb(1), two equivalent Pb(2), and one As(1) atom. In the fourth O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fifth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Pb(1), one Pb(2), and one As(2) atom.
Pb2As2O5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(5) atom. The Pb(1)-O(1) bond length is 2.49 Å. The Pb(1)-O(2) bond length is 2.35 Å. The Pb(1)-O(4) bond length is 2.34 Å. The Pb(1)-O(5) bond length is 2.42 Å. In the second Pb site, Pb(2) is bonded in a 5-coordinate geometry to one O(1), one O(4), one O(5), and two equivalent O(2) atoms. The Pb(2)-O(1) bond length is 2.30 Å. The Pb(2)-O(4) bond length is 2.43 Å. The Pb(2)-O(5) bond length is 2.51 Å. There is one shorter (2.55 Å) and one longer (2.79 Å) Pb(2)-O(2) bond length. There are two inequivalent As sites. In the first As site, As(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. The As(1)-O(1) bond length is 1.76 Å. The As(1)-O(2) bond length is 1.78 Å. The As(1)-O(3) bond length is 1.84 Å. In the second As site, As(2) is bonded in a distorted trigonal non-coplanar geometry to one O(3), one O(4), and one O(5) atom. The As(2)-O(3) bond length is 1.86 Å. The As(2)-O(4) bond length is 1.78 Å. The As(2)-O(5) bond length is 1.74 Å. There are five inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Pb(1), one Pb(2), and one As(2) atom. In the second O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Pb(1), one Pb(2), and one As(1) atom. In the third O site, O(2) is bonded in a 1-coordinate geometry to one Pb(1), two equivalent Pb(2), and one As(1) atom. In the fourth O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fifth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Pb(1), one Pb(2), and one As(2) atom.