Li2Cu4Si4O13 is Chalcostibite-derived structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form distorted LiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra, and  a cornercorner with one Cu(3)O5 trigonal bipyramid. In the second Li site, Li(2) is bonded in a 4-coordinate geometry to one O(10), one O(11), one O(12), and one O(9) atom. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to one O(4), one O(5), and two equivalent O(1) atoms. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(6) atoms. In the third Cu site, Cu(3) is bonded to one O(10), one O(3), one O(7), and two equivalent O(8) atoms to form distorted CuO5 trigonal bipyramids that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and  an edgeedge with one Cu(3)O5 trigonal bipyramid. In the fourth Cu site, Cu(4) is bonded in a 4-coordinate geometry to one O(10), one O(4), one O(7), and one O(9) atom. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(9) atom to form SiO4 tetrahedra that share corners with three equivalent Li(1)O4 tetrahedra and  a cornercorner with one Cu(3)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(10), one O(12), one O(13), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Cu(3)O5 trigonal bipyramid. In the third Si site, Si(3) is bonded to one O(11), one O(12), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Cu(3)O5 trigonal bipyramids. In the fourth Si site, Si(4) is bonded to one O(1), one O(11), one O(13), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Cu(3)O5 trigonal bipyramid. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cu(1) and one Si(4) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Li(1), one Cu(2), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Li(1), one Cu(2), one Cu(3), and one Si(1) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Li(1), one Cu(1), one Cu(4), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(1), one Cu(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Cu(2) and one Si(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Cu(3), one Cu(4), and one Si(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Cu(3) and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Li(2), one Cu(4), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Li(2), one Cu(3), one Cu(4), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Li(2), one Si(3), and one Si(4) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Li(2), one Si(2), and one Si(3) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Si(2) and one Si(4) atom.
Li2Cu4Si4O13 is Chalcostibite-derived structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form distorted LiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra, and  a cornercorner with one Cu(3)O5 trigonal bipyramid. The Li(1)-O(2) bond length is 1.94 Å. The Li(1)-O(3) bond length is 2.21 Å. The Li(1)-O(4) bond length is 2.26 Å. The Li(1)-O(5) bond length is 1.96 Å. In the second Li site, Li(2) is bonded in a 4-coordinate geometry to one O(10), one O(11), one O(12), and one O(9) atom. The Li(2)-O(10) bond length is 2.11 Å. The Li(2)-O(11) bond length is 1.98 Å. The Li(2)-O(12) bond length is 2.14 Å. The Li(2)-O(9) bond length is 1.89 Å. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to one O(4), one O(5), and two equivalent O(1) atoms. The Cu(1)-O(4) bond length is 1.98 Å. The Cu(1)-O(5) bond length is 1.94 Å. There is one shorter (2.01 Å) and one longer (2.04 Å) Cu(1)-O(1) bond length. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(6) atoms. The Cu(2)-O(2) bond length is 1.93 Å. The Cu(2)-O(3) bond length is 2.01 Å. There is one shorter (1.94 Å) and one longer (2.11 Å) Cu(2)-O(6) bond length. In the third Cu site, Cu(3) is bonded to one O(10), one O(3), one O(7), and two equivalent O(8) atoms to form distorted CuO5 trigonal bipyramids that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and  an edgeedge with one Cu(3)O5 trigonal bipyramid. The Cu(3)-O(10) bond length is 1.95 Å. The Cu(3)-O(3) bond length is 2.19 Å. The Cu(3)-O(7) bond length is 2.25 Å. There is one shorter (1.89 Å) and one longer (2.26 Å) Cu(3)-O(8) bond length. In the fourth Cu site, Cu(4) is bonded in a 4-coordinate geometry to one O(10), one O(4), one O(7), and one O(9) atom. The Cu(4)-O(10) bond length is 2.45 Å. The Cu(4)-O(4) bond length is 2.10 Å. The Cu(4)-O(7) bond length is 1.88 Å. The Cu(4)-O(9) bond length is 1.88 Å. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(9) atom to form SiO4 tetrahedra that share corners with three equivalent Li(1)O4 tetrahedra and  a cornercorner with one Cu(3)O5 trigonal bipyramid. The Si(1)-O(2) bond length is 1.63 Å. The Si(1)-O(3) bond length is 1.66 Å. The Si(1)-O(4) bond length is 1.69 Å. The Si(1)-O(9) bond length is 1.65 Å. In the second Si site, Si(2) is bonded to one O(10), one O(12), one O(13), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Cu(3)O5 trigonal bipyramid. The Si(2)-O(10) bond length is 1.63 Å. The Si(2)-O(12) bond length is 1.65 Å. The Si(2)-O(13) bond length is 1.64 Å. The Si(2)-O(5) bond length is 1.61 Å. In the third Si site, Si(3) is bonded to one O(11), one O(12), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Cu(3)O5 trigonal bipyramids. The Si(3)-O(11) bond length is 1.63 Å. The Si(3)-O(12) bond length is 1.65 Å. The Si(3)-O(6) bond length is 1.63 Å. The Si(3)-O(8) bond length is 1.60 Å. In the fourth Si site, Si(4) is bonded to one O(1), one O(11), one O(13), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Cu(3)O5 trigonal bipyramid. The Si(4)-O(1) bond length is 1.64 Å. The Si(4)-O(11) bond length is 1.63 Å. The Si(4)-O(13) bond length is 1.64 Å. The Si(4)-O(7) bond length is 1.62 Å. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cu(1) and one Si(4) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Li(1), one Cu(2), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Li(1), one Cu(2), one Cu(3), and one Si(1) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Li(1), one Cu(1), one Cu(4), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(1), one Cu(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Cu(2) and one Si(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Cu(3), one Cu(4), and one Si(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Cu(3) and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Li(2), one Cu(4), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Li(2), one Cu(3), one Cu(4), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Li(2), one Si(3), and one Si(4) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Li(2), one Si(2), and one Si(3) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Si(2) and one Si(4) atom.