Cu11In9 crystallizes in the monoclinic P2/m space group. There are seven inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 10-coordinate geometry to two equivalent Cu(3), two equivalent Cu(5), two equivalent In(1), and four equivalent In(4) atoms. In the second Cu site, Cu(2) is bonded in a 10-coordinate geometry to two equivalent Cu(4), two equivalent Cu(6), two equivalent In(2), and four equivalent In(3) atoms. In the third Cu site, Cu(3) is bonded in a 11-coordinate geometry to one Cu(1), one Cu(5), two equivalent Cu(6), one In(1), one In(3), one In(5), two equivalent In(2), and two equivalent In(4) atoms. In the fourth Cu site, Cu(4) is bonded in a 11-coordinate geometry to one Cu(2), one Cu(6), one Cu(7), two equivalent Cu(5), one In(2), one In(4), two equivalent In(1), and two equivalent In(3) atoms. In the fifth Cu site, Cu(5) is bonded in a 11-coordinate geometry to one Cu(1), one Cu(3), two equivalent Cu(4), two equivalent Cu(7), one In(3), two equivalent In(1), and two equivalent In(4) atoms. In the sixth Cu site, Cu(6) is bonded in a 11-coordinate geometry to one Cu(2), one Cu(4), two equivalent Cu(3), one In(4), two equivalent In(2), two equivalent In(3), and two equivalent In(5) atoms. In the seventh Cu site, Cu(7) is bonded to two equivalent Cu(4), four equivalent Cu(5), two equivalent In(4), and four equivalent In(1) atoms to form face-sharing CuIn6Cu6 cuboctahedra. There are five inequivalent In sites. In the first In site, In(1) is bonded in a 4-coordinate geometry to one Cu(1), one Cu(3), two equivalent Cu(4), two equivalent Cu(5), and two equivalent Cu(7) atoms. In the second In site, In(2) is bonded in a 6-coordinate geometry to one Cu(2), one Cu(4), two equivalent Cu(3), and two equivalent Cu(6) atoms. In the third In site, In(3) is bonded in a 8-coordinate geometry to one Cu(3), one Cu(5), two equivalent Cu(2), two equivalent Cu(4), and two equivalent Cu(6) atoms. In the fourth In site, In(4) is bonded in a 9-coordinate geometry to one Cu(4), one Cu(6), one Cu(7), two equivalent Cu(1), two equivalent Cu(3), and two equivalent Cu(5) atoms. In the fifth In site, In(5) is bonded in a 6-coordinate geometry to two equivalent Cu(3) and four equivalent Cu(6) atoms.
Cu11In9 crystallizes in the monoclinic P2/m space group. There are seven inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 10-coordinate geometry to two equivalent Cu(3), two equivalent Cu(5), two equivalent In(1), and four equivalent In(4) atoms. Both Cu(1)-Cu(3) bond lengths are 2.65 Å. Both Cu(1)-Cu(5) bond lengths are 2.75 Å. Both Cu(1)-In(1) bond lengths are 2.69 Å. All Cu(1)-In(4) bond lengths are 2.67 Å. In the second Cu site, Cu(2) is bonded in a 10-coordinate geometry to two equivalent Cu(4), two equivalent Cu(6), two equivalent In(2), and four equivalent In(3) atoms. Both Cu(2)-Cu(4) bond lengths are 2.78 Å. Both Cu(2)-Cu(6) bond lengths are 2.68 Å. Both Cu(2)-In(2) bond lengths are 2.80 Å. All Cu(2)-In(3) bond lengths are 2.67 Å. In the third Cu site, Cu(3) is bonded in a 11-coordinate geometry to one Cu(1), one Cu(5), two equivalent Cu(6), one In(1), one In(3), one In(5), two equivalent In(2), and two equivalent In(4) atoms. The Cu(3)-Cu(5) bond length is 2.71 Å. Both Cu(3)-Cu(6) bond lengths are 2.76 Å. The Cu(3)-In(1) bond length is 2.70 Å. The Cu(3)-In(3) bond length is 2.89 Å. The Cu(3)-In(5) bond length is 2.62 Å. Both Cu(3)-In(2) bond lengths are 2.89 Å. Both Cu(3)-In(4) bond lengths are 2.73 Å. In the fourth Cu site, Cu(4) is bonded in a 11-coordinate geometry to one Cu(2), one Cu(6), one Cu(7), two equivalent Cu(5), one In(2), one In(4), two equivalent In(1), and two equivalent In(3) atoms. The Cu(4)-Cu(6) bond length is 2.69 Å. The Cu(4)-Cu(7) bond length is 2.49 Å. Both Cu(4)-Cu(5) bond lengths are 2.70 Å. The Cu(4)-In(2) bond length is 2.63 Å. The Cu(4)-In(4) bond length is 2.76 Å. Both Cu(4)-In(1) bond lengths are 2.89 Å. Both Cu(4)-In(3) bond lengths are 2.69 Å. In the fifth Cu site, Cu(5) is bonded in a 11-coordinate geometry to one Cu(1), one Cu(3), two equivalent Cu(4), two equivalent Cu(7), one In(3), two equivalent In(1), and two equivalent In(4) atoms. Both Cu(5)-Cu(7) bond lengths are 2.74 Å. The Cu(5)-In(3) bond length is 2.76 Å. There is one shorter (2.59 Å) and one longer (2.68 Å) Cu(5)-In(1) bond length. Both Cu(5)-In(4) bond lengths are 2.63 Å. In the sixth Cu site, Cu(6) is bonded in a 11-coordinate geometry to one Cu(2), one Cu(4), two equivalent Cu(3), one In(4), two equivalent In(2), two equivalent In(3), and two equivalent In(5) atoms. The Cu(6)-In(4) bond length is 2.81 Å. There is one shorter (2.72 Å) and one longer (2.93 Å) Cu(6)-In(2) bond length. Both Cu(6)-In(3) bond lengths are 2.68 Å. Both Cu(6)-In(5) bond lengths are 2.82 Å. In the seventh Cu site, Cu(7) is bonded to two equivalent Cu(4), four equivalent Cu(5), two equivalent In(4), and four equivalent In(1) atoms to form face-sharing CuIn6Cu6 cuboctahedra. Both Cu(7)-In(4) bond lengths are 2.92 Å. All Cu(7)-In(1) bond lengths are 2.98 Å. There are five inequivalent In sites. In the first In site, In(1) is bonded in a 4-coordinate geometry to one Cu(1), one Cu(3), two equivalent Cu(4), two equivalent Cu(5), and two equivalent Cu(7) atoms. In the second In site, In(2) is bonded in a 6-coordinate geometry to one Cu(2), one Cu(4), two equivalent Cu(3), and two equivalent Cu(6) atoms. In the third In site, In(3) is bonded in a 8-coordinate geometry to one Cu(3), one Cu(5), two equivalent Cu(2), two equivalent Cu(4), and two equivalent Cu(6) atoms. In the fourth In site, In(4) is bonded in a 9-coordinate geometry to one Cu(4), one Cu(6), one Cu(7), two equivalent Cu(1), two equivalent Cu(3), and two equivalent Cu(5) atoms. In the fifth In site, In(5) is bonded in a 6-coordinate geometry to two equivalent Cu(3) and four equivalent Cu(6) atoms.