Pr2Br5 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 8-coordinate geometry to one Br(1), two equivalent Br(4), two equivalent Br(5), and three equivalent Br(2) atoms. In the second Pr site, Pr(2) is bonded to one Br(4), one Br(5), two equivalent Br(1), and three equivalent Br(3) atoms to form distorted edge-sharing PrBr7 pentagonal bipyramids. There are five inequivalent Br sites. In the first Br site, Br(1) is bonded in a distorted L-shaped geometry to one Pr(1) and two equivalent Pr(2) atoms. In the second Br site, Br(2) is bonded in a trigonal non-coplanar geometry to three equivalent Pr(1) atoms. In the third Br site, Br(3) is bonded in a trigonal non-coplanar geometry to three equivalent Pr(2) atoms. In the fourth Br site, Br(4) is bonded in a distorted T-shaped geometry to one Pr(2) and two equivalent Pr(1) atoms. In the fifth Br site, Br(5) is bonded in a distorted T-shaped geometry to one Pr(2) and two equivalent Pr(1) atoms.
Pr2Br5 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 8-coordinate geometry to one Br(1), two equivalent Br(4), two equivalent Br(5), and three equivalent Br(2) atoms. The Pr(1)-Br(1) bond length is 3.62 Å. Both Pr(1)-Br(4) bond lengths are 3.03 Å. Both Pr(1)-Br(5) bond lengths are 3.05 Å. There are two shorter (3.03 Å) and one longer (3.14 Å) Pr(1)-Br(2) bond length. In the second Pr site, Pr(2) is bonded to one Br(4), one Br(5), two equivalent Br(1), and three equivalent Br(3) atoms to form distorted edge-sharing PrBr7 pentagonal bipyramids. The Pr(2)-Br(4) bond length is 3.01 Å. The Pr(2)-Br(5) bond length is 3.04 Å. Both Pr(2)-Br(1) bond lengths are 2.98 Å. There are two shorter (3.03 Å) and one longer (3.13 Å) Pr(2)-Br(3) bond length. There are five inequivalent Br sites. In the first Br site, Br(1) is bonded in a distorted L-shaped geometry to one Pr(1) and two equivalent Pr(2) atoms. In the second Br site, Br(2) is bonded in a trigonal non-coplanar geometry to three equivalent Pr(1) atoms. In the third Br site, Br(3) is bonded in a trigonal non-coplanar geometry to three equivalent Pr(2) atoms. In the fourth Br site, Br(4) is bonded in a distorted T-shaped geometry to one Pr(2) and two equivalent Pr(1) atoms. In the fifth Br site, Br(5) is bonded in a distorted T-shaped geometry to one Pr(2) and two equivalent Pr(1) atoms.