Ho3ReO8 crystallizes in the monoclinic P2_1/m space group. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms. In the second Ho site, Ho(2) is bonded in a 6-coordinate geometry to one O(1), one O(6), and four equivalent O(5) atoms. In the third Ho site, Ho(3) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(6), two equivalent O(2), and two equivalent O(5) atoms. Re(1) is bonded in an octahedral geometry to one O(1), one O(3), one O(4), one O(6), and two equivalent O(2) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(2), and one Re(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(3), and one Re(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(3), and one Re(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(3), and one Re(1) atom. In the fifth O site, O(5) is bonded to one Ho(1), one Ho(3), and two equivalent Ho(2) atoms to form a mixture of distorted edge and corner-sharing OHo4 tetrahedra. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ho(2), one Ho(3), and one Re(1) atom.
Ho3ReO8 crystallizes in the monoclinic P2_1/m space group. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms. The Ho(1)-O(1) bond length is 2.36 Å. The Ho(1)-O(3) bond length is 2.41 Å. The Ho(1)-O(4) bond length is 2.31 Å. Both Ho(1)-O(2) bond lengths are 2.35 Å. Both Ho(1)-O(5) bond lengths are 2.24 Å. In the second Ho site, Ho(2) is bonded in a 6-coordinate geometry to one O(1), one O(6), and four equivalent O(5) atoms. The Ho(2)-O(1) bond length is 2.42 Å. The Ho(2)-O(6) bond length is 2.44 Å. There are two shorter (2.36 Å) and two longer (2.38 Å) Ho(2)-O(5) bond lengths. In the third Ho site, Ho(3) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(6), two equivalent O(2), and two equivalent O(5) atoms. The Ho(3)-O(3) bond length is 2.42 Å. The Ho(3)-O(4) bond length is 2.32 Å. The Ho(3)-O(6) bond length is 2.34 Å. Both Ho(3)-O(2) bond lengths are 2.35 Å. Both Ho(3)-O(5) bond lengths are 2.24 Å. Re(1) is bonded in an octahedral geometry to one O(1), one O(3), one O(4), one O(6), and two equivalent O(2) atoms. The Re(1)-O(1) bond length is 1.90 Å. The Re(1)-O(3) bond length is 1.84 Å. The Re(1)-O(4) bond length is 1.95 Å. The Re(1)-O(6) bond length is 1.91 Å. Both Re(1)-O(2) bond lengths are 1.89 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(2), and one Re(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(3), and one Re(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(3), and one Re(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(3), and one Re(1) atom. In the fifth O site, O(5) is bonded to one Ho(1), one Ho(3), and two equivalent Ho(2) atoms to form a mixture of distorted edge and corner-sharing OHo4 tetrahedra. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ho(2), one Ho(3), and one Re(1) atom.