CeP2 crystallizes in the monoclinic Cc space group. There are four inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 9-coordinate geometry to one P(1), one P(2), one P(5), one P(7), one P(8), two equivalent P(3), and two equivalent P(6) atoms. In the second Ce site, Ce(2) is bonded in a 9-coordinate geometry to one P(1), one P(2), one P(3), one P(5), one P(8), two equivalent P(4), and two equivalent P(7) atoms. In the third Ce site, Ce(3) is bonded in a 9-coordinate geometry to one P(1), one P(2), one P(5), one P(6), one P(8), two equivalent P(3), and two equivalent P(4) atoms. In the fourth Ce site, Ce(4) is bonded in a 9-coordinate geometry to one P(1), one P(2), one P(4), one P(5), one P(8), two equivalent P(6), and two equivalent P(7) atoms. There are eight inequivalent P sites. In the first P site, P(1) is bonded in a 6-coordinate geometry to one Ce(1), one Ce(2), one Ce(3), one Ce(4), one P(2), and one P(5) atom. In the second P site, P(2) is bonded in a 6-coordinate geometry to one Ce(1), one Ce(2), one Ce(3), one Ce(4), one P(1), and one P(4) atom. In the third P site, P(3) is bonded in a 6-coordinate geometry to one Ce(2), two equivalent Ce(1), two equivalent Ce(3), and one P(5) atom. In the fourth P site, P(4) is bonded in a 6-coordinate geometry to one Ce(4), two equivalent Ce(2), two equivalent Ce(3), and one P(2) atom. In the fifth P site, P(5) is bonded in a 6-coordinate geometry to one Ce(1), one Ce(2), one Ce(3), one Ce(4), one P(1), and one P(3) atom. In the sixth P site, P(6) is bonded to one Ce(3), two equivalent Ce(1), two equivalent Ce(4), and one P(8) atom to form a mixture of distorted corner, face, and edge-sharing PCe5P octahedra. The corner-sharing octahedral tilt angles range from 38-55°. In the seventh P site, P(7) is bonded to one Ce(1), two equivalent Ce(2), two equivalent Ce(4), and one P(8) atom to form a mixture of distorted corner, face, and edge-sharing PCe5P pentagonal pyramids. The corner-sharing octahedral tilt angles range from 35-49°. In the eighth P site, P(8) is bonded in a 6-coordinate geometry to one Ce(1), one Ce(2), one Ce(3), one Ce(4), one P(6), and one P(7) atom.
CeP2 crystallizes in the monoclinic Cc space group. There are four inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 9-coordinate geometry to one P(1), one P(2), one P(5), one P(7), one P(8), two equivalent P(3), and two equivalent P(6) atoms. The Ce(1)-P(1) bond length is 3.00 Å. The Ce(1)-P(2) bond length is 3.07 Å. The Ce(1)-P(5) bond length is 3.16 Å. The Ce(1)-P(7) bond length is 2.95 Å. The Ce(1)-P(8) bond length is 3.12 Å. There is one shorter (2.96 Å) and one longer (3.02 Å) Ce(1)-P(3) bond length. There is one shorter (2.88 Å) and one longer (2.98 Å) Ce(1)-P(6) bond length. In the second Ce site, Ce(2) is bonded in a 9-coordinate geometry to one P(1), one P(2), one P(3), one P(5), one P(8), two equivalent P(4), and two equivalent P(7) atoms. The Ce(2)-P(1) bond length is 2.97 Å. The Ce(2)-P(2) bond length is 2.87 Å. The Ce(2)-P(3) bond length is 2.89 Å. The Ce(2)-P(5) bond length is 3.03 Å. The Ce(2)-P(8) bond length is 2.97 Å. There is one shorter (2.93 Å) and one longer (3.02 Å) Ce(2)-P(4) bond length. There is one shorter (2.94 Å) and one longer (2.95 Å) Ce(2)-P(7) bond length. In the third Ce site, Ce(3) is bonded in a 9-coordinate geometry to one P(1), one P(2), one P(5), one P(6), one P(8), two equivalent P(3), and two equivalent P(4) atoms. The Ce(3)-P(1) bond length is 2.92 Å. The Ce(3)-P(2) bond length is 2.91 Å. The Ce(3)-P(5) bond length is 2.96 Å. The Ce(3)-P(6) bond length is 2.88 Å. The Ce(3)-P(8) bond length is 3.14 Å. There is one shorter (2.90 Å) and one longer (2.97 Å) Ce(3)-P(3) bond length. There is one shorter (2.92 Å) and one longer (3.02 Å) Ce(3)-P(4) bond length. In the fourth Ce site, Ce(4) is bonded in a 9-coordinate geometry to one P(1), one P(2), one P(4), one P(5), one P(8), two equivalent P(6), and two equivalent P(7) atoms. The Ce(4)-P(1) bond length is 2.94 Å. The Ce(4)-P(2) bond length is 3.09 Å. The Ce(4)-P(4) bond length is 2.94 Å. The Ce(4)-P(5) bond length is 2.98 Å. The Ce(4)-P(8) bond length is 2.86 Å. There is one shorter (3.00 Å) and one longer (3.07 Å) Ce(4)-P(6) bond length. There is one shorter (2.92 Å) and one longer (3.03 Å) Ce(4)-P(7) bond length. There are eight inequivalent P sites. In the first P site, P(1) is bonded in a 6-coordinate geometry to one Ce(1), one Ce(2), one Ce(3), one Ce(4), one P(2), and one P(5) atom. The P(1)-P(2) bond length is 2.32 Å. The P(1)-P(5) bond length is 2.24 Å. In the second P site, P(2) is bonded in a 6-coordinate geometry to one Ce(1), one Ce(2), one Ce(3), one Ce(4), one P(1), and one P(4) atom. The P(2)-P(4) bond length is 2.24 Å. In the third P site, P(3) is bonded in a 6-coordinate geometry to one Ce(2), two equivalent Ce(1), two equivalent Ce(3), and one P(5) atom. The P(3)-P(5) bond length is 2.25 Å. In the fourth P site, P(4) is bonded in a 6-coordinate geometry to one Ce(4), two equivalent Ce(2), two equivalent Ce(3), and one P(2) atom. In the fifth P site, P(5) is bonded in a 6-coordinate geometry to one Ce(1), one Ce(2), one Ce(3), one Ce(4), one P(1), and one P(3) atom. In the sixth P site, P(6) is bonded to one Ce(3), two equivalent Ce(1), two equivalent Ce(4), and one P(8) atom to form a mixture of distorted corner, face, and edge-sharing PCe5P octahedra. The corner-sharing octahedral tilt angles range from 38-55°. The P(6)-P(8) bond length is 2.24 Å. In the seventh P site, P(7) is bonded to one Ce(1), two equivalent Ce(2), two equivalent Ce(4), and one P(8) atom to form a mixture of distorted corner, face, and edge-sharing PCe5P pentagonal pyramids. The corner-sharing octahedral tilt angles range from 35-49°. The P(7)-P(8) bond length is 2.22 Å. In the eighth P site, P(8) is bonded in a 6-coordinate geometry to one Ce(1), one Ce(2), one Ce(3), one Ce(4), one P(6), and one P(7) atom.