K3VCO8 crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(6), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(5), one O(6), two equivalent O(3), and three equivalent O(4) atoms. V(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(6), two equivalent O(3), and two equivalent O(4) atoms. C(1) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), two equivalent K(2), one V(1), and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one V(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), one V(1), and one O(4) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(1), three equivalent K(2), one V(1), and one O(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), and one C(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), one V(1), and one C(1) atom.
K3VCO8 crystallizes in the monoclinic Cm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(6), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. The K(1)-O(1) bond length is 3.13 Å. The K(1)-O(2) bond length is 2.85 Å. The K(1)-O(6) bond length is 3.26 Å. Both K(1)-O(3) bond lengths are 3.02 Å. Both K(1)-O(4) bond lengths are 2.81 Å. There is one shorter (2.85 Å) and one longer (3.03 Å) K(1)-O(5) bond length. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(5), one O(6), two equivalent O(3), and three equivalent O(4) atoms. The K(2)-O(1) bond length is 2.92 Å. The K(2)-O(2) bond length is 3.04 Å. The K(2)-O(5) bond length is 2.85 Å. The K(2)-O(6) bond length is 2.71 Å. There is one shorter (2.71 Å) and one longer (2.75 Å) K(2)-O(3) bond length. There are a spread of K(2)-O(4) bond distances ranging from 2.84-3.12 Å. V(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(6), two equivalent O(3), and two equivalent O(4) atoms. The V(1)-O(1) bond length is 2.06 Å. The V(1)-O(2) bond length is 1.67 Å. The V(1)-O(6) bond length is 2.31 Å. Both V(1)-O(3) bond lengths are 1.90 Å. Both V(1)-O(4) bond lengths are 1.97 Å. C(1) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(6) atom. The C(1)-O(1) bond length is 1.33 Å. The C(1)-O(5) bond length is 1.27 Å. The C(1)-O(6) bond length is 1.30 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), two equivalent K(2), one V(1), and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one V(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), one V(1), and one O(4) atom. The O(3)-O(4) bond length is 1.47 Å. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(1), three equivalent K(2), one V(1), and one O(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), and one C(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), one V(1), and one C(1) atom.