Cu2Pb7Si2(S2O13)2 crystallizes in the monoclinic C2/m space group. Cu(1) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(7) atoms to form distorted CuO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent S(1)O4 tetrahedra, and edges with two equivalent Cu(1)O6 octahedra. There are four inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted pentagonal planar geometry to one O(10), two equivalent O(3), and two equivalent O(7) atoms. In the second Pb site, Pb(2) is bonded in a distorted T-shaped geometry to one O(6) and two equivalent O(3) atoms. In the third Pb site, Pb(3) is bonded in a 6-coordinate geometry to one O(2), one O(6), two equivalent O(7), and two equivalent O(8) atoms. In the fourth Pb site, Pb(4) is bonded in a 6-coordinate geometry to two equivalent O(9) and four equivalent O(3) atoms. Si(1) is bonded to one O(1), one O(6), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(2), one O(4), and two equivalent O(7) atoms to form SO4 tetrahedra that share corners with two equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(5), one O(9), and two equivalent O(8) atoms. There are ten inequivalent O sites. In the first O site, O(2) is bonded in a single-bond geometry to one Pb(3) and one S(1) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), one Pb(4), and one Si(1) atom. In the third O site, O(4) is bonded in a single-bond geometry to one S(1) atom. In the fourth O site, O(5) is bonded in a single-bond geometry to one S(2) atom. In the fifth O site, O(6) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one Si(1) atom. In the sixth O site, O(7) is bonded in a distorted single-bond geometry to one Cu(1), one Pb(1), one Pb(3), and one S(1) atom. In the seventh O site, O(8) is bonded in a distorted single-bond geometry to one Pb(3) and one S(2) atom. In the eighth O site, O(9) is bonded in a single-bond geometry to one Pb(4) and one S(2) atom. In the ninth O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cu(1) and one Pb(1) atom. In the tenth O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one Si(1) atom.
Cu2Pb7Si2(S2O13)2 crystallizes in the monoclinic C2/m space group. Cu(1) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(7) atoms to form distorted CuO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent S(1)O4 tetrahedra, and edges with two equivalent Cu(1)O6 octahedra. Both Cu(1)-O(1) bond lengths are 1.98 Å. Both Cu(1)-O(10) bond lengths are 1.84 Å. Both Cu(1)-O(7) bond lengths are 2.47 Å. There are four inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted pentagonal planar geometry to one O(10), two equivalent O(3), and two equivalent O(7) atoms. The Pb(1)-O(10) bond length is 2.42 Å. Both Pb(1)-O(3) bond lengths are 2.49 Å. Both Pb(1)-O(7) bond lengths are 2.60 Å. In the second Pb site, Pb(2) is bonded in a distorted T-shaped geometry to one O(6) and two equivalent O(3) atoms. The Pb(2)-O(6) bond length is 2.40 Å. Both Pb(2)-O(3) bond lengths are 2.52 Å. In the third Pb site, Pb(3) is bonded in a 6-coordinate geometry to one O(2), one O(6), two equivalent O(7), and two equivalent O(8) atoms. The Pb(3)-O(2) bond length is 2.72 Å. The Pb(3)-O(6) bond length is 2.57 Å. Both Pb(3)-O(7) bond lengths are 2.75 Å. Both Pb(3)-O(8) bond lengths are 2.58 Å. In the fourth Pb site, Pb(4) is bonded in a 6-coordinate geometry to two equivalent O(9) and four equivalent O(3) atoms. Both Pb(4)-O(9) bond lengths are 2.72 Å. All Pb(4)-O(3) bond lengths are 2.58 Å. Si(1) is bonded to one O(1), one O(6), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. The Si(1)-O(1) bond length is 1.71 Å. The Si(1)-O(6) bond length is 1.64 Å. Both Si(1)-O(3) bond lengths are 1.65 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(2), one O(4), and two equivalent O(7) atoms to form SO4 tetrahedra that share corners with two equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. The S(1)-O(2) bond length is 1.50 Å. The S(1)-O(4) bond length is 1.46 Å. Both S(1)-O(7) bond lengths are 1.51 Å. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(5), one O(9), and two equivalent O(8) atoms. The S(2)-O(5) bond length is 1.47 Å. The S(2)-O(9) bond length is 1.52 Å. Both S(2)-O(8) bond lengths are 1.51 Å. There are ten inequivalent O sites. In the first O site, O(2) is bonded in a single-bond geometry to one Pb(3) and one S(1) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), one Pb(4), and one Si(1) atom. In the third O site, O(4) is bonded in a single-bond geometry to one S(1) atom. In the fourth O site, O(5) is bonded in a single-bond geometry to one S(2) atom. In the fifth O site, O(6) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one Si(1) atom. In the sixth O site, O(7) is bonded in a distorted single-bond geometry to one Cu(1), one Pb(1), one Pb(3), and one S(1) atom. In the seventh O site, O(8) is bonded in a distorted single-bond geometry to one Pb(3) and one S(2) atom. In the eighth O site, O(9) is bonded in a single-bond geometry to one Pb(4) and one S(2) atom. In the ninth O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cu(1) and one Pb(1) atom. In the tenth O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one Si(1) atom.