Cu13Si2(SbO14)2 crystallizes in the triclinic P-1 space group. There are seven inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(12), one O(2), one O(7), and one O(8) atom to form distorted CuO5 trigonal bipyramids that share  a cornercorner with one Cu(4)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Cu(7)O5 square pyramid,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Cu(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 57-61°. In the second Cu site, Cu(2) is bonded to one O(1), one O(10), one O(11), one O(3), and one O(7) atom to form CuO5 trigonal bipyramids that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Cu(7)O5 square pyramid, corners with three equivalent Si(1)O4 tetrahedra, and corners with two equivalent Cu(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 56°. In the third Cu site, Cu(3) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(13), one O(14), and one O(8) atom. In the fourth Cu site, Cu(4) is bonded to one O(12), one O(13), two equivalent O(5), and two equivalent O(9) atoms to form CuO6 octahedra that share  a cornercorner with one Cu(1)O5 trigonal bipyramid, edges with two equivalent Cu(4)O6 octahedra, edges with three equivalent Sb(1)O6 octahedra, and  an edgeedge with one Cu(7)O5 square pyramid. In the fifth Cu site, Cu(5) is bonded in a rectangular see-saw-like geometry to one O(3), one O(6), one O(7), and one O(8) atom. In the sixth Cu site, Cu(6) is bonded in a 8-coordinate geometry to two equivalent O(10), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. In the seventh Cu site, Cu(7) is bonded to one O(10), one O(12), one O(13), one O(4), and one O(6) atom to form distorted CuO5 square pyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Cu(1)O5 trigonal bipyramid,  a cornercorner with one Cu(2)O5 trigonal bipyramid,  an edgeedge with one Cu(4)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Si(1) is bonded to one O(11), one O(3), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Cu(7)O5 square pyramid,  a cornercorner with one Cu(1)O5 trigonal bipyramid, and corners with three equivalent Cu(2)O5 trigonal bipyramids. Sb(1) is bonded to one O(10), one O(12), one O(13), one O(5), one O(6), and one O(9) atom to form SbO6 octahedra that share  a cornercorner with one Cu(1)O5 trigonal bipyramid,  a cornercorner with one Cu(2)O5 trigonal bipyramid, edges with three equivalent Cu(4)O6 octahedra, and edges with two equivalent Cu(7)O5 square pyramids. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one Cu(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(1) and one O(14) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Cu(2), one Cu(5), one Cu(6), and one Si(1) atom. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Cu(6), one Cu(7), and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cu(4) and one Sb(1) atom. In the sixth O site, O(6) is bonded to one Cu(5), one Cu(6), one Cu(7), and one Sb(1) atom to form distorted corner-sharing OCu3Sb tetrahedra. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Cu(1), one Cu(2), one Cu(5), and one Si(1) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(3), and one Cu(5) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to two equivalent Cu(4) and one Sb(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Cu(2), one Cu(6), one Cu(7), and one Sb(1) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one Si(1) atom. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Cu(1), one Cu(4), one Cu(7), and one Sb(1) atom. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Cu(3), one Cu(4), one Cu(7), and one Sb(1) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Cu(3) and one O(2) atom.
Cu13Si2(SbO14)2 crystallizes in the triclinic P-1 space group. There are seven inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(12), one O(2), one O(7), and one O(8) atom to form distorted CuO5 trigonal bipyramids that share  a cornercorner with one Cu(4)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Cu(7)O5 square pyramid,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Cu(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 57-61°. The Cu(1)-O(1) bond length is 1.89 Å. The Cu(1)-O(12) bond length is 1.88 Å. The Cu(1)-O(2) bond length is 1.90 Å. The Cu(1)-O(7) bond length is 2.49 Å. The Cu(1)-O(8) bond length is 1.85 Å. In the second Cu site, Cu(2) is bonded to one O(1), one O(10), one O(11), one O(3), and one O(7) atom to form CuO5 trigonal bipyramids that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Cu(7)O5 square pyramid, corners with three equivalent Si(1)O4 tetrahedra, and corners with two equivalent Cu(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 56°. The Cu(2)-O(1) bond length is 1.89 Å. The Cu(2)-O(10) bond length is 1.95 Å. The Cu(2)-O(11) bond length is 1.99 Å. The Cu(2)-O(3) bond length is 1.95 Å. The Cu(2)-O(7) bond length is 2.34 Å. In the third Cu site, Cu(3) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(13), one O(14), and one O(8) atom. The Cu(3)-O(1) bond length is 1.84 Å. The Cu(3)-O(13) bond length is 1.92 Å. The Cu(3)-O(14) bond length is 1.89 Å. The Cu(3)-O(8) bond length is 1.92 Å. In the fourth Cu site, Cu(4) is bonded to one O(12), one O(13), two equivalent O(5), and two equivalent O(9) atoms to form CuO6 octahedra that share  a cornercorner with one Cu(1)O5 trigonal bipyramid, edges with two equivalent Cu(4)O6 octahedra, edges with three equivalent Sb(1)O6 octahedra, and  an edgeedge with one Cu(7)O5 square pyramid. The Cu(4)-O(12) bond length is 2.07 Å. The Cu(4)-O(13) bond length is 2.20 Å. Both Cu(4)-O(5) bond lengths are 2.03 Å. There is one shorter (2.00 Å) and one longer (2.01 Å) Cu(4)-O(9) bond length. In the fifth Cu site, Cu(5) is bonded in a rectangular see-saw-like geometry to one O(3), one O(6), one O(7), and one O(8) atom. The Cu(5)-O(3) bond length is 1.90 Å. The Cu(5)-O(6) bond length is 1.91 Å. The Cu(5)-O(7) bond length is 1.93 Å. The Cu(5)-O(8) bond length is 1.85 Å. In the sixth Cu site, Cu(6) is bonded in a 8-coordinate geometry to two equivalent O(10), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. Both Cu(6)-O(10) bond lengths are 2.70 Å. Both Cu(6)-O(3) bond lengths are 2.54 Å. Both Cu(6)-O(4) bond lengths are 1.94 Å. Both Cu(6)-O(6) bond lengths are 2.35 Å. In the seventh Cu site, Cu(7) is bonded to one O(10), one O(12), one O(13), one O(4), and one O(6) atom to form distorted CuO5 square pyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Cu(1)O5 trigonal bipyramid,  a cornercorner with one Cu(2)O5 trigonal bipyramid,  an edgeedge with one Cu(4)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. The Cu(7)-O(10) bond length is 1.96 Å. The Cu(7)-O(12) bond length is 2.46 Å. The Cu(7)-O(13) bond length is 2.05 Å. The Cu(7)-O(4) bond length is 1.99 Å. The Cu(7)-O(6) bond length is 2.00 Å. Si(1) is bonded to one O(11), one O(3), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Cu(7)O5 square pyramid,  a cornercorner with one Cu(1)O5 trigonal bipyramid, and corners with three equivalent Cu(2)O5 trigonal bipyramids. The Si(1)-O(11) bond length is 1.63 Å. The Si(1)-O(3) bond length is 1.70 Å. The Si(1)-O(4) bond length is 1.66 Å. The Si(1)-O(7) bond length is 1.65 Å. Sb(1) is bonded to one O(10), one O(12), one O(13), one O(5), one O(6), and one O(9) atom to form SbO6 octahedra that share  a cornercorner with one Cu(1)O5 trigonal bipyramid,  a cornercorner with one Cu(2)O5 trigonal bipyramid, edges with three equivalent Cu(4)O6 octahedra, and edges with two equivalent Cu(7)O5 square pyramids. The Sb(1)-O(10) bond length is 2.02 Å. The Sb(1)-O(12) bond length is 2.02 Å. The Sb(1)-O(13) bond length is 2.07 Å. The Sb(1)-O(5) bond length is 2.02 Å. The Sb(1)-O(6) bond length is 2.11 Å. The Sb(1)-O(9) bond length is 2.03 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one Cu(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(1) and one O(14) atom. The O(2)-O(14) bond length is 1.31 Å. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Cu(2), one Cu(5), one Cu(6), and one Si(1) atom. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Cu(6), one Cu(7), and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cu(4) and one Sb(1) atom. In the sixth O site, O(6) is bonded to one Cu(5), one Cu(6), one Cu(7), and one Sb(1) atom to form distorted corner-sharing OCu3Sb tetrahedra. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Cu(1), one Cu(2), one Cu(5), and one Si(1) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(3), and one Cu(5) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to two equivalent Cu(4) and one Sb(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Cu(2), one Cu(6), one Cu(7), and one Sb(1) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one Si(1) atom. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Cu(1), one Cu(4), one Cu(7), and one Sb(1) atom. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Cu(3), one Cu(4), one Cu(7), and one Sb(1) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Cu(3) and one O(2) atom.