Cu11In9 crystallizes in the monoclinic C2/m space group. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 11-coordinate geometry to one Cu(3), one Cu(6), two equivalent Cu(4), two equivalent Cu(5), one In(2), two equivalent In(1), and two equivalent In(3) atoms. In the second Cu site, Cu(2) is bonded in a 11-coordinate geometry to one Cu(3), one Cu(5), two equivalent Cu(6), one In(1), two equivalent In(2), two equivalent In(4), and two equivalent In(5) atoms. In the third Cu site, Cu(3) is bonded in a 10-coordinate geometry to one Cu(1), one Cu(2), one Cu(5), one Cu(6), one In(3), one In(4), two equivalent In(1), and two equivalent In(2) atoms. In the fourth Cu site, Cu(4) is bonded to two equivalent Cu(5), four equivalent Cu(1), two equivalent In(1), and four equivalent In(3) atoms to form face-sharing CuIn6Cu6 cuboctahedra. In the fifth Cu site, Cu(5) is bonded in a 11-coordinate geometry to one Cu(2), one Cu(3), one Cu(4), two equivalent Cu(1), one In(1), two equivalent In(2), and three equivalent In(3) atoms. In the sixth Cu site, Cu(6) is bonded in a 11-coordinate geometry to one Cu(1), one Cu(3), two equivalent Cu(2), one In(2), one In(5), two equivalent In(1), and three equivalent In(4) atoms. There are five inequivalent In sites. In the first In site, In(1) is bonded in a 9-coordinate geometry to one Cu(2), one Cu(4), one Cu(5), two equivalent Cu(1), two equivalent Cu(3), two equivalent Cu(6), and one In(2) atom. In the second In site, In(2) is bonded in a 11-coordinate geometry to one Cu(1), one Cu(6), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(5), one In(1), one In(3), and one In(5) atom. In the third In site, In(3) is bonded in a 11-coordinate geometry to one Cu(3), two equivalent Cu(1), two equivalent Cu(4), three equivalent Cu(5), one In(2), and two equivalent In(3) atoms. In the fourth In site, In(4) is bonded in a 6-coordinate geometry to one Cu(3), two equivalent Cu(2), and three equivalent Cu(6) atoms. In the fifth In site, In(5) is bonded in a 6-coordinate geometry to two equivalent Cu(6), four equivalent Cu(2), and two equivalent In(2) atoms.
Cu11In9 crystallizes in the monoclinic C2/m space group. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 11-coordinate geometry to one Cu(3), one Cu(6), two equivalent Cu(4), two equivalent Cu(5), one In(2), two equivalent In(1), and two equivalent In(3) atoms. The Cu(1)-Cu(3) bond length is 2.77 Å. The Cu(1)-Cu(6) bond length is 2.61 Å. Both Cu(1)-Cu(4) bond lengths are 2.78 Å. Both Cu(1)-Cu(5) bond lengths are 2.83 Å. The Cu(1)-In(2) bond length is 2.83 Å. Both Cu(1)-In(1) bond lengths are 2.70 Å. There is one shorter (2.60 Å) and one longer (2.73 Å) Cu(1)-In(3) bond length. In the second Cu site, Cu(2) is bonded in a 11-coordinate geometry to one Cu(3), one Cu(5), two equivalent Cu(6), one In(1), two equivalent In(2), two equivalent In(4), and two equivalent In(5) atoms. The Cu(2)-Cu(3) bond length is 2.73 Å. The Cu(2)-Cu(5) bond length is 2.64 Å. Both Cu(2)-Cu(6) bond lengths are 2.85 Å. The Cu(2)-In(1) bond length is 2.84 Å. Both Cu(2)-In(2) bond lengths are 2.78 Å. There is one shorter (2.69 Å) and one longer (2.89 Å) Cu(2)-In(4) bond length. Both Cu(2)-In(5) bond lengths are 2.83 Å. In the third Cu site, Cu(3) is bonded in a 10-coordinate geometry to one Cu(1), one Cu(2), one Cu(5), one Cu(6), one In(3), one In(4), two equivalent In(1), and two equivalent In(2) atoms. The Cu(3)-Cu(5) bond length is 2.73 Å. The Cu(3)-Cu(6) bond length is 2.64 Å. The Cu(3)-In(3) bond length is 2.67 Å. The Cu(3)-In(4) bond length is 2.72 Å. Both Cu(3)-In(1) bond lengths are 2.77 Å. Both Cu(3)-In(2) bond lengths are 2.73 Å. In the fourth Cu site, Cu(4) is bonded to two equivalent Cu(5), four equivalent Cu(1), two equivalent In(1), and four equivalent In(3) atoms to form face-sharing CuIn6Cu6 cuboctahedra. Both Cu(4)-Cu(5) bond lengths are 2.50 Å. Both Cu(4)-In(1) bond lengths are 2.84 Å. All Cu(4)-In(3) bond lengths are 3.11 Å. In the fifth Cu site, Cu(5) is bonded in a 11-coordinate geometry to one Cu(2), one Cu(3), one Cu(4), two equivalent Cu(1), one In(1), two equivalent In(2), and three equivalent In(3) atoms. The Cu(5)-In(1) bond length is 2.80 Å. Both Cu(5)-In(2) bond lengths are 2.75 Å. There is one shorter (2.72 Å) and two longer (2.92 Å) Cu(5)-In(3) bond lengths. In the sixth Cu site, Cu(6) is bonded in a 11-coordinate geometry to one Cu(1), one Cu(3), two equivalent Cu(2), one In(2), one In(5), two equivalent In(1), and three equivalent In(4) atoms. The Cu(6)-In(2) bond length is 2.95 Å. The Cu(6)-In(5) bond length is 2.62 Å. Both Cu(6)-In(1) bond lengths are 2.77 Å. There is one shorter (2.66 Å) and two longer (2.96 Å) Cu(6)-In(4) bond lengths. There are five inequivalent In sites. In the first In site, In(1) is bonded in a 9-coordinate geometry to one Cu(2), one Cu(4), one Cu(5), two equivalent Cu(1), two equivalent Cu(3), two equivalent Cu(6), and one In(2) atom. The In(1)-In(2) bond length is 3.09 Å. In the second In site, In(2) is bonded in a 11-coordinate geometry to one Cu(1), one Cu(6), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(5), one In(1), one In(3), and one In(5) atom. The In(2)-In(3) bond length is 3.20 Å. The In(2)-In(5) bond length is 3.06 Å. In the third In site, In(3) is bonded in a 11-coordinate geometry to one Cu(3), two equivalent Cu(1), two equivalent Cu(4), three equivalent Cu(5), one In(2), and two equivalent In(3) atoms. Both In(3)-In(3) bond lengths are 3.22 Å. In the fourth In site, In(4) is bonded in a 6-coordinate geometry to one Cu(3), two equivalent Cu(2), and three equivalent Cu(6) atoms. In the fifth In site, In(5) is bonded in a 6-coordinate geometry to two equivalent Cu(6), four equivalent Cu(2), and two equivalent In(2) atoms.