K3BP2 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 5-coordinate geometry to one B(1) and four equivalent P(1) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to two equivalent B(1) and five equivalent P(1) atoms. B(1) is bonded in a 7-coordinate geometry to one K(1), four equivalent K(2), and two equivalent P(1) atoms. P(1) is bonded in a 1-coordinate geometry to two equivalent K(1), five equivalent K(2), and one B(1) atom.
K3BP2 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 5-coordinate geometry to one B(1) and four equivalent P(1) atoms. The K(1)-B(1) bond length is 3.26 Å. There are two shorter (3.39 Å) and two longer (3.46 Å) K(1)-P(1) bond lengths. In the second K site, K(2) is bonded in a 7-coordinate geometry to two equivalent B(1) and five equivalent P(1) atoms. There is one shorter (3.06 Å) and one longer (3.32 Å) K(2)-B(1) bond length. There are a spread of K(2)-P(1) bond distances ranging from 3.31-3.55 Å. B(1) is bonded in a 7-coordinate geometry to one K(1), four equivalent K(2), and two equivalent P(1) atoms. Both B(1)-P(1) bond lengths are 1.77 Å. P(1) is bonded in a 1-coordinate geometry to two equivalent K(1), five equivalent K(2), and one B(1) atom.