Cu5As2 crystallizes in the triclinic P-1 space group. There are five 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(4), two equivalent Cu(5), two equivalent As(1), and two equivalent As(2) atoms. In the second Cu site, Cu(2) is bonded in a 10-coordinate geometry to two equivalent Cu(3), two equivalent Cu(4), two equivalent Cu(5), two equivalent As(1), and two equivalent As(2) atoms. In the third Cu site, Cu(3) is bonded in a 4-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent As(1), and two equivalent As(2) atoms. In the fourth Cu site, Cu(4) is bonded in a 4-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent As(1), and two equivalent As(2) atoms. In the fifth Cu site, Cu(5) is bonded in a 4-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent As(1), and two equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 10-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(4), and two equivalent Cu(5) atoms. In the second As site, As(2) is bonded in a 10-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(4), and two equivalent Cu(5) atoms.
Cu5As2 crystallizes in the triclinic P-1 space group. There are five 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(4), two equivalent Cu(5), two equivalent As(1), and two equivalent As(2) atoms. There is one shorter (2.60 Å) and one longer (2.69 Å) Cu(1)-Cu(3) bond length. There is one shorter (2.60 Å) and one longer (2.70 Å) Cu(1)-Cu(4) bond length. Both Cu(1)-Cu(5) bond lengths are 2.58 Å. Both Cu(1)-As(1) bond lengths are 2.77 Å. There is one shorter (2.48 Å) and one longer (2.55 Å) Cu(1)-As(2) bond length. In the second Cu site, Cu(2) is bonded in a 10-coordinate geometry to two equivalent Cu(3), two equivalent Cu(4), two equivalent Cu(5), two equivalent As(1), and two equivalent As(2) atoms. There is one shorter (2.61 Å) and one longer (2.70 Å) Cu(2)-Cu(3) bond length. There is one shorter (2.60 Å) and one longer (2.70 Å) Cu(2)-Cu(4) bond length. Both Cu(2)-Cu(5) bond lengths are 2.58 Å. There is one shorter (2.48 Å) and one longer (2.54 Å) Cu(2)-As(1) bond length. There is one shorter (2.77 Å) and one longer (2.78 Å) Cu(2)-As(2) bond length. In the third Cu site, Cu(3) is bonded in a 4-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent As(1), and two equivalent As(2) atoms. There is one shorter (2.51 Å) and one longer (2.60 Å) Cu(3)-As(1) bond length. There is one shorter (2.51 Å) and one longer (2.59 Å) Cu(3)-As(2) bond length. In the fourth Cu site, Cu(4) is bonded in a 4-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent As(1), and two equivalent As(2) atoms. There is one shorter (2.51 Å) and one longer (2.59 Å) Cu(4)-As(1) bond length. There is one shorter (2.51 Å) and one longer (2.59 Å) Cu(4)-As(2) bond length. In the fifth Cu site, Cu(5) is bonded in a 4-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent As(1), and two equivalent As(2) atoms. Both Cu(5)-As(1) bond lengths are 2.53 Å. Both Cu(5)-As(2) bond lengths are 2.53 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 10-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(4), and two equivalent Cu(5) atoms. In the second As site, As(2) is bonded in a 10-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(4), and two equivalent Cu(5) atoms.