Cu6Sn5 crystallizes in the monoclinic C2/c space group. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted q6 geometry to one Cu(1), one Cu(2), one Cu(4), one Sn(3), two equivalent Sn(2), and three equivalent Sn(1) atoms. In the second Cu site, Cu(2) is bonded in a distorted q6 geometry to one Cu(1), one Cu(3), one Cu(4), one Sn(3), two equivalent Sn(1), and three equivalent Sn(2) atoms. In the third Cu site, Cu(3) is bonded in a distorted q6 geometry to two equivalent Cu(2), two equivalent Cu(4), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms. In the fourth Cu site, Cu(4) is bonded in a 11-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), one Sn(3), two equivalent Sn(1), and two equivalent Sn(2) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(3) is bonded in a 7-coordinate geometry to one Cu(4), two equivalent Cu(1), two equivalent Cu(2), and two equivalent Cu(3) atoms. In the second Sn site, Sn(1) is bonded in a 7-coordinate geometry to one Cu(3), one Cu(4), two equivalent Cu(2), and three equivalent Cu(1) atoms. In the third Sn site, Sn(2) is bonded in a 7-coordinate geometry to one Cu(3), one Cu(4), two equivalent Cu(1), and three equivalent Cu(2) atoms.
Cu6Sn5 crystallizes in the monoclinic C2/c space group. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted q6 geometry to one Cu(1), one Cu(2), one Cu(4), one Sn(3), two equivalent Sn(2), and three equivalent Sn(1) atoms. The Cu(1)-Cu(1) bond length is 2.53 Å. The Cu(1)-Cu(2) bond length is 2.56 Å. The Cu(1)-Cu(4) bond length is 2.60 Å. The Cu(1)-Sn(3) bond length is 2.70 Å. There is one shorter (2.68 Å) and one longer (2.74 Å) Cu(1)-Sn(2) bond length. There are a spread of Cu(1)-Sn(1) bond distances ranging from 2.69-2.84 Å. In the second Cu site, Cu(2) is bonded in a distorted q6 geometry to one Cu(1), one Cu(3), one Cu(4), one Sn(3), two equivalent Sn(1), and three equivalent Sn(2) atoms. The Cu(2)-Cu(3) bond length is 2.52 Å. The Cu(2)-Cu(4) bond length is 2.65 Å. The Cu(2)-Sn(3) bond length is 2.75 Å. There is one shorter (2.67 Å) and one longer (2.82 Å) Cu(2)-Sn(1) bond length. There are a spread of Cu(2)-Sn(2) bond distances ranging from 2.69-2.75 Å. In the third Cu site, Cu(3) is bonded in a distorted q6 geometry to two equivalent Cu(2), two equivalent Cu(4), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms. Both Cu(3)-Cu(4) bond lengths are 2.73 Å. Both Cu(3)-Sn(1) bond lengths are 2.76 Å. Both Cu(3)-Sn(2) bond lengths are 2.78 Å. Both Cu(3)-Sn(3) bond lengths are 2.86 Å. In the fourth Cu site, Cu(4) is bonded in a 11-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), one Sn(3), two equivalent Sn(1), and two equivalent Sn(2) atoms. The Cu(4)-Sn(3) bond length is 2.63 Å. Both Cu(4)-Sn(1) bond lengths are 2.64 Å. Both Cu(4)-Sn(2) bond lengths are 2.71 Å. There are three inequivalent Sn sites. In the first Sn site, Sn(3) is bonded in a 7-coordinate geometry to one Cu(4), two equivalent Cu(1), two equivalent Cu(2), and two equivalent Cu(3) atoms. In the second Sn site, Sn(1) is bonded in a 7-coordinate geometry to one Cu(3), one Cu(4), two equivalent Cu(2), and three equivalent Cu(1) atoms. In the third Sn site, Sn(2) is bonded in a 7-coordinate geometry to one Cu(3), one Cu(4), two equivalent Cu(1), and three equivalent Cu(2) atoms.