K(Cu2As)2 crystallizes in the trigonal R-3m space group. K(1) is bonded in a 6-coordinate geometry to six equivalent As(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 1-coordinate geometry to four equivalent As(1) atoms. In the second Cu site, Cu(2) is bonded in a 3-coordinate geometry to three equivalent As(1) atoms. As(1) is bonded in a 10-coordinate geometry to three equivalent K(1), three equivalent Cu(2), and four equivalent Cu(1) atoms.
K(Cu2As)2 crystallizes in the trigonal R-3m space group. K(1) is bonded in a 6-coordinate geometry to six equivalent As(1) atoms. All K(1)-As(1) bond lengths are 3.36 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 1-coordinate geometry to four equivalent As(1) atoms. There is one shorter (2.47 Å) and three longer (2.73 Å) Cu(1)-As(1) bond lengths. In the second Cu site, Cu(2) is bonded in a 3-coordinate geometry to three equivalent As(1) atoms. All Cu(2)-As(1) bond lengths are 2.42 Å. As(1) is bonded in a 10-coordinate geometry to three equivalent K(1), three equivalent Cu(2), and four equivalent Cu(1) atoms.