Ce2Br5 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Br(2), one Br(3), two equivalent Br(5), and three equivalent Br(1) atoms to form distorted edge-sharing CeBr7 pentagonal bipyramids. In the second Ce site, Ce(2) is bonded in a 8-coordinate geometry to one Br(5), two equivalent Br(2), two equivalent Br(3), and three equivalent Br(4) atoms. There are five inequivalent Br sites. In the first Br site, Br(1) is bonded in a trigonal non-coplanar geometry to three equivalent Ce(1) atoms. In the second Br site, Br(2) is bonded in a distorted T-shaped geometry to one Ce(1) and two equivalent Ce(2) atoms. In the third Br site, Br(3) is bonded in a distorted T-shaped geometry to one Ce(1) and two equivalent Ce(2) atoms. In the fourth Br site, Br(4) is bonded in a trigonal non-coplanar geometry to three equivalent Ce(2) atoms. In the fifth Br site, Br(5) is bonded in a 3-coordinate geometry to one Ce(2) and two equivalent Ce(1) atoms.
Ce2Br5 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Br(2), one Br(3), two equivalent Br(5), and three equivalent Br(1) atoms to form distorted edge-sharing CeBr7 pentagonal bipyramids. The Ce(1)-Br(2) bond length is 3.03 Å. The Ce(1)-Br(3) bond length is 3.03 Å. Both Ce(1)-Br(5) bond lengths are 3.00 Å. There are two shorter (3.04 Å) and one longer (3.13 Å) Ce(1)-Br(1) bond length. In the second Ce site, Ce(2) is bonded in a 8-coordinate geometry to one Br(5), two equivalent Br(2), two equivalent Br(3), and three equivalent Br(4) atoms. The Ce(2)-Br(5) bond length is 3.46 Å. Both Ce(2)-Br(2) bond lengths are 3.07 Å. Both Ce(2)-Br(3) bond lengths are 3.10 Å. There are two shorter (3.04 Å) and one longer (3.17 Å) Ce(2)-Br(4) bond length. There are five inequivalent Br sites. In the first Br site, Br(1) is bonded in a trigonal non-coplanar geometry to three equivalent Ce(1) atoms. In the second Br site, Br(2) is bonded in a distorted T-shaped geometry to one Ce(1) and two equivalent Ce(2) atoms. In the third Br site, Br(3) is bonded in a distorted T-shaped geometry to one Ce(1) and two equivalent Ce(2) atoms. In the fourth Br site, Br(4) is bonded in a trigonal non-coplanar geometry to three equivalent Ce(2) atoms. In the fifth Br site, Br(5) is bonded in a 3-coordinate geometry to one Ce(2) and two equivalent Ce(1) atoms.