K3Cu(CN)4 crystallizes in the trigonal R3c space group. K(1) is bonded in a 9-coordinate geometry to one C(2), three equivalent C(1), one N(2), and four equivalent N(1) atoms. Cu(1) is bonded in a tetrahedral geometry to one C(2) and three equivalent C(1) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted linear geometry to three equivalent K(1), one Cu(1), and one N(1) atom. In the second C site, C(2) is bonded in a distorted linear geometry to three equivalent K(1), one Cu(1), and one N(2) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and one C(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to three equivalent K(1) and one C(2) atom.
K3Cu(CN)4 crystallizes in the trigonal R3c space group. K(1) is bonded in a 9-coordinate geometry to one C(2), three equivalent C(1), one N(2), and four equivalent N(1) atoms. The K(1)-C(2) bond length is 3.39 Å. There are a spread of K(1)-C(1) bond distances ranging from 3.07-3.33 Å. The K(1)-N(2) bond length is 2.99 Å. There are a spread of K(1)-N(1) bond distances ranging from 2.83-3.11 Å. Cu(1) is bonded in a tetrahedral geometry to one C(2) and three equivalent C(1) atoms. The Cu(1)-C(2) bond length is 1.96 Å. All Cu(1)-C(1) bond lengths are 1.95 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted linear geometry to three equivalent K(1), one Cu(1), and one N(1) atom. The C(1)-N(1) bond length is 1.18 Å. In the second C site, C(2) is bonded in a distorted linear geometry to three equivalent K(1), one Cu(1), and one N(2) atom. The C(2)-N(2) bond length is 1.18 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and one C(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to three equivalent K(1) and one C(2) atom.