PPPr crystallizes in the monoclinic P2_1/c space group. Pr(1) is bonded in a 9-coordinate geometry to four equivalent P(2) and five equivalent P(1) atoms. There are two inequivalent P sites. In the first P site, P(2) is bonded in a 6-coordinate geometry to four equivalent Pr(1), one P(1), and one P(2) atom. In the second P site, P(1) is bonded to five equivalent Pr(1) and one P(2) atom to form a mixture of distorted edge and corner-sharing PPr5P pentagonal pyramids.
PPPr crystallizes in the monoclinic P2_1/c space group. Pr(1) is bonded in a 9-coordinate geometry to four equivalent P(2) and five equivalent P(1) atoms. There are a spread of Pr(1)-P(2) bond distances ranging from 3.00-3.19 Å. There are a spread of Pr(1)-P(1) bond distances ranging from 2.94-3.17 Å. There are two inequivalent P sites. In the first P site, P(2) is bonded in a 6-coordinate geometry to four equivalent Pr(1), one P(1), and one P(2) atom. The P(2)-P(1) bond length is 2.21 Å. The P(2)-P(2) bond length is 2.26 Å. In the second P site, P(1) is bonded to five equivalent Pr(1) and one P(2) atom to form a mixture of distorted edge and corner-sharing PPr5P pentagonal pyramids.