K3BAs2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to two equivalent B(1) and two equivalent As(1) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one B(1) and four equivalent As(1) atoms. B(1) is bonded in a 7-coordinate geometry to one K(2), four equivalent K(1), and two equivalent As(1) atoms. As(1) is bonded in a 1-coordinate geometry to two equivalent K(1), two equivalent K(2), and one B(1) atom.
K3BAs2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to two equivalent B(1) and two equivalent As(1) atoms. There is one shorter (3.13 Å) and one longer (3.45 Å) K(1)-B(1) bond length. There is one shorter (3.42 Å) and one longer (3.55 Å) K(1)-As(1) bond length. In the second K site, K(2) is bonded in a 5-coordinate geometry to one B(1) and four equivalent As(1) atoms. The K(2)-B(1) bond length is 3.30 Å. There are two shorter (3.47 Å) and two longer (3.58 Å) K(2)-As(1) bond lengths. B(1) is bonded in a 7-coordinate geometry to one K(2), four equivalent K(1), and two equivalent As(1) atoms. Both B(1)-As(1) bond lengths are 1.89 Å. As(1) is bonded in a 1-coordinate geometry to two equivalent K(1), two equivalent K(2), and one B(1) atom.