PrAs2 crystallizes in the monoclinic P2_1/c space group. Pr(1) is bonded in a 9-coordinate geometry to four equivalent As(1) and five equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(2) is bonded to five equivalent Pr(1) and one As(1) atom to form a mixture of distorted edge and corner-sharing AsPr5As pentagonal pyramids. In the second As site, As(1) is bonded in a 6-coordinate geometry to four equivalent Pr(1), one As(1), and one As(2) atom.
PrAs2 crystallizes in the monoclinic P2_1/c space group. Pr(1) is bonded in a 9-coordinate geometry to four equivalent As(1) and five equivalent As(2) atoms. There are a spread of Pr(1)-As(1) bond distances ranging from 3.12-3.25 Å. There are a spread of Pr(1)-As(2) bond distances ranging from 3.03-3.24 Å. There are two inequivalent As sites. In the first As site, As(2) is bonded to five equivalent Pr(1) and one As(1) atom to form a mixture of distorted edge and corner-sharing AsPr5As pentagonal pyramids. The As(2)-As(1) bond length is 2.47 Å. In the second As site, As(1) is bonded in a 6-coordinate geometry to four equivalent Pr(1), one As(1), and one As(2) atom. The As(1)-As(1) bond length is 2.50 Å.