BaH4(OCl)2 crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded in a 9-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent Cl(2), and three equivalent Cl(1) atoms. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(2) atom. There are two inequivalent O sites. In the first O site, O(2) is bonded in a water-like geometry to two equivalent Ba(1), one H(3), and one H(4) atom. In the second O site, O(1) is bonded in a water-like geometry to two equivalent Ba(1), one H(1), and one H(2) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 3-coordinate geometry to three equivalent Ba(1) atoms. In the second Cl site, Cl(2) is bonded in a 3-coordinate geometry to two equivalent Ba(1) atoms.
BaH4(OCl)2 crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded in a 9-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent Cl(2), and three equivalent Cl(1) atoms. There is one shorter (2.88 Å) and one longer (2.89 Å) Ba(1)-O(1) bond length. There is one shorter (2.90 Å) and one longer (2.93 Å) Ba(1)-O(2) bond length. There is one shorter (3.21 Å) and one longer (3.27 Å) Ba(1)-Cl(2) bond length. There are a spread of Ba(1)-Cl(1) bond distances ranging from 3.17-3.39 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. The H(2)-O(1) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(2) atom. The H(3)-O(2) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(2) atom. The H(4)-O(2) bond length is 0.98 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a water-like geometry to two equivalent Ba(1), one H(3), and one H(4) atom. In the second O site, O(1) is bonded in a water-like geometry to two equivalent Ba(1), one H(1), and one H(2) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 3-coordinate geometry to three equivalent Ba(1) atoms. In the second Cl site, Cl(2) is bonded in a 3-coordinate geometry to two equivalent Ba(1) atoms.