Y4OsBr4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent Os(1), two equivalent Br(1), and two equivalent Br(2) atoms to form a mixture of distorted edge, face, and corner-sharing YOs2Br4 pentagonal pyramids. In the second Y site, Y(2) is bonded to two equivalent Os(1), two equivalent Br(1), and two equivalent Br(2) atoms to form a mixture of distorted edge, face, and corner-sharing YOs2Br4 pentagonal pyramids. Os(1) is bonded in a 8-coordinate geometry to four equivalent Y(1) and four equivalent Y(2) atoms. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 4-coordinate geometry to two equivalent Y(1) and two equivalent Y(2) atoms. In the second Br site, Br(2) is bonded in a 4-coordinate geometry to two equivalent Y(1) and two equivalent Y(2) atoms.
Y4OsBr4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent Os(1), two equivalent Br(1), and two equivalent Br(2) atoms to form a mixture of distorted edge, face, and corner-sharing YOs2Br4 pentagonal pyramids. There is one shorter (2.90 Å) and one longer (2.91 Å) Y(1)-Os(1) bond length. There is one shorter (2.97 Å) and one longer (3.11 Å) Y(1)-Br(1) bond length. There is one shorter (3.06 Å) and one longer (3.12 Å) Y(1)-Br(2) bond length. In the second Y site, Y(2) is bonded to two equivalent Os(1), two equivalent Br(1), and two equivalent Br(2) atoms to form a mixture of distorted edge, face, and corner-sharing YOs2Br4 pentagonal pyramids. Both Y(2)-Os(1) bond lengths are 2.91 Å. There is one shorter (2.98 Å) and one longer (3.11 Å) Y(2)-Br(1) bond length. There is one shorter (2.96 Å) and one longer (3.09 Å) Y(2)-Br(2) bond length. Os(1) is bonded in a 8-coordinate geometry to four equivalent Y(1) and four equivalent Y(2) atoms. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 4-coordinate geometry to two equivalent Y(1) and two equivalent Y(2) atoms. In the second Br site, Br(2) is bonded in a 4-coordinate geometry to two equivalent Y(1) and two equivalent Y(2) atoms.