BaReH9 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded in a 18-coordinate geometry to two equivalent H(4), four equivalent H(1), four equivalent H(3), and eight equivalent H(2) atoms. Re(1) is bonded in a 9-coordinate geometry to one H(4), two equivalent H(1), two equivalent H(3), and four equivalent H(2) atoms. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to two equivalent Ba(1) and one Re(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to two equivalent Ba(1) and one Re(1) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one Re(1) atom. In the fourth H site, H(4) is bonded in a distorted trigonal planar geometry to two equivalent Ba(1) and one Re(1) atom.
BaReH9 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded in a 18-coordinate geometry to two equivalent H(4), four equivalent H(1), four equivalent H(3), and eight equivalent H(2) atoms. Both Ba(1)-H(4) bond lengths are 2.68 Å. All Ba(1)-H(1) bond lengths are 2.92 Å. All Ba(1)-H(3) bond lengths are 2.81 Å. There are four shorter (3.01 Å) and four longer (3.04 Å) Ba(1)-H(2) bond lengths. Re(1) is bonded in a 9-coordinate geometry to one H(4), two equivalent H(1), two equivalent H(3), and four equivalent H(2) atoms. The Re(1)-H(4) bond length is 1.68 Å. Both Re(1)-H(1) bond lengths are 1.69 Å. Both Re(1)-H(3) bond lengths are 1.72 Å. All Re(1)-H(2) bond lengths are 1.70 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to two equivalent Ba(1) and one Re(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to two equivalent Ba(1) and one Re(1) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one Re(1) atom. In the fourth H site, H(4) is bonded in a distorted trigonal planar geometry to two equivalent Ba(1) and one Re(1) atom.