Cu4PbAs3O12 crystallizes in the triclinic P-1 space group. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted T-shaped geometry to one O(10), one O(3), and one O(4) atom. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to two equivalent O(11) and two equivalent O(12) atoms. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(6) atoms. In the fourth Cu site, Cu(4) is bonded to one O(10), one O(11), one O(2), one O(3), and one O(7) atom to form CuO5 trigonal bipyramids that share  a cornercorner with one As(2)O4 tetrahedra, corners with two equivalent As(1)O4 tetrahedra, and corners with two equivalent As(3)O4 tetrahedra. In the fifth Cu site, Cu(5) is bonded to one O(1), one O(4), one O(5), one O(6), and one O(9) atom to form CuO5 trigonal bipyramids that share  a cornercorner with one As(3)O4 tetrahedra, corners with two equivalent As(1)O4 tetrahedra, and corners with two equivalent As(2)O4 tetrahedra. Pb(1) is bonded in a 6-coordinate geometry to one O(12), one O(2), one O(5), one O(7), and two equivalent O(8) atoms. There are three inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with two equivalent Cu(4)O5 trigonal bipyramids and corners with two equivalent Cu(5)O5 trigonal bipyramids. In the second As site, As(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Cu(4)O5 trigonal bipyramid and corners with two equivalent Cu(5)O5 trigonal bipyramids. In the third As site, As(3) is bonded to one O(10), one O(11), one O(12), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one Cu(5)O5 trigonal bipyramid and corners with two equivalent Cu(4)O5 trigonal bipyramids. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Cu(3), one Cu(5), and one As(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Cu(4), one Pb(1), and one As(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Cu(1), one Cu(4), 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 Cu(5), and one As(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Cu(5), one Pb(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Cu(3), one Cu(5), and one As(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Cu(4), one Pb(1), and one As(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Pb(1) and one As(2) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Cu(5) and one As(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(4), and one As(3) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Cu(2), one Cu(4), and one As(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Cu(2), one Pb(1), and one As(3) atom.
Cu4PbAs3O12 crystallizes in the triclinic P-1 space group. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted T-shaped geometry to one O(10), one O(3), and one O(4) atom. The Cu(1)-O(10) bond length is 2.50 Å. The Cu(1)-O(3) bond length is 1.87 Å. The Cu(1)-O(4) bond length is 1.89 Å. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to two equivalent O(11) and two equivalent O(12) atoms. Both Cu(2)-O(11) bond lengths are 1.98 Å. Both Cu(2)-O(12) bond lengths are 1.97 Å. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(6) atoms. Both Cu(3)-O(1) bond lengths are 1.92 Å. Both Cu(3)-O(6) bond lengths are 2.00 Å. In the fourth Cu site, Cu(4) is bonded to one O(10), one O(11), one O(2), one O(3), and one O(7) atom to form CuO5 trigonal bipyramids that share  a cornercorner with one As(2)O4 tetrahedra, corners with two equivalent As(1)O4 tetrahedra, and corners with two equivalent As(3)O4 tetrahedra. The Cu(4)-O(10) bond length is 1.97 Å. The Cu(4)-O(11) bond length is 2.13 Å. The Cu(4)-O(2) bond length is 2.02 Å. The Cu(4)-O(3) bond length is 2.21 Å. The Cu(4)-O(7) bond length is 1.97 Å. In the fifth Cu site, Cu(5) is bonded to one O(1), one O(4), one O(5), one O(6), and one O(9) atom to form CuO5 trigonal bipyramids that share  a cornercorner with one As(3)O4 tetrahedra, corners with two equivalent As(1)O4 tetrahedra, and corners with two equivalent As(2)O4 tetrahedra. The Cu(5)-O(1) bond length is 2.09 Å. The Cu(5)-O(4) bond length is 2.15 Å. The Cu(5)-O(5) bond length is 2.11 Å. The Cu(5)-O(6) bond length is 2.00 Å. The Cu(5)-O(9) bond length is 1.95 Å. Pb(1) is bonded in a 6-coordinate geometry to one O(12), one O(2), one O(5), one O(7), and two equivalent O(8) atoms. The Pb(1)-O(12) bond length is 2.77 Å. The Pb(1)-O(2) bond length is 2.61 Å. The Pb(1)-O(5) bond length is 2.72 Å. The Pb(1)-O(7) bond length is 2.56 Å. There is one shorter (2.50 Å) and one longer (2.56 Å) Pb(1)-O(8) bond length. There are three inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with two equivalent Cu(4)O5 trigonal bipyramids and corners with two equivalent Cu(5)O5 trigonal bipyramids. The As(1)-O(1) bond length is 1.75 Å. The As(1)-O(2) bond length is 1.72 Å. The As(1)-O(3) bond length is 1.74 Å. The As(1)-O(4) bond length is 1.75 Å. In the second As site, As(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Cu(4)O5 trigonal bipyramid and corners with two equivalent Cu(5)O5 trigonal bipyramids. The As(2)-O(5) bond length is 1.72 Å. The As(2)-O(6) bond length is 1.79 Å. The As(2)-O(7) bond length is 1.74 Å. The As(2)-O(8) bond length is 1.72 Å. In the third As site, As(3) is bonded to one O(10), one O(11), one O(12), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one Cu(5)O5 trigonal bipyramid and corners with two equivalent Cu(4)O5 trigonal bipyramids. The As(3)-O(10) bond length is 1.74 Å. The As(3)-O(11) bond length is 1.77 Å. The As(3)-O(12) bond length is 1.74 Å. The As(3)-O(9) bond length is 1.71 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Cu(3), one Cu(5), and one As(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Cu(4), one Pb(1), and one As(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Cu(1), one Cu(4), 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 Cu(5), and one As(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Cu(5), one Pb(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Cu(3), one Cu(5), and one As(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Cu(4), one Pb(1), and one As(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Pb(1) and one As(2) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Cu(5) and one As(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(4), and one As(3) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Cu(2), one Cu(4), and one As(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Cu(2), one Pb(1), and one As(3) atom.