Cu2PbAs2O10 crystallizes in the monoclinic C2/m space group. Cu(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form CuO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra and edges with two equivalent Cu(1)O6 octahedra. Pb(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(4) atoms. As(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with four equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-61°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Cu(1) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Pb(1) and one As(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Cu(1) and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cu(1), one Pb(1), and one As(1) atom.
Cu2PbAs2O10 crystallizes in the monoclinic C2/m space group. Cu(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form CuO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra and edges with two equivalent Cu(1)O6 octahedra. Both Cu(1)-O(1) bond lengths are 1.81 Å. Both Cu(1)-O(3) bond lengths are 2.26 Å. Both Cu(1)-O(4) bond lengths are 1.92 Å. Pb(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(4) atoms. Both Pb(1)-O(2) bond lengths are 2.70 Å. All Pb(1)-O(4) bond lengths are 2.60 Å. As(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with four equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-61°. The As(1)-O(2) bond length is 1.69 Å. The As(1)-O(3) bond length is 1.73 Å. Both As(1)-O(4) bond lengths are 1.76 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Cu(1) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Pb(1) and one As(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Cu(1) and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cu(1), one Pb(1), and one As(1) atom.