BaZnH8(CO3)4(CH2)2 crystallizes in the orthorhombic Pccn space group. The structure consists of eight 02329_fluka molecules inside a BaZnH8(CO3)4 framework. In the BaZnH8(CO3)4 framework, Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(5), two equivalent O(6), and four equivalent O(4) atoms. Both Ba(1)-O(5) bond lengths are 2.87 Å. Both Ba(1)-O(6) bond lengths are 2.87 Å. There are two shorter (2.79 Å) and two longer (2.85 Å) Ba(1)-O(4) bond lengths. Zn(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Zn(1)-O(1) bond lengths are 2.34 Å. Both Zn(1)-O(2) bond lengths are 2.06 Å. Both Zn(1)-O(3) bond lengths are 2.04 Å. There are two inequivalent C sites. In the first C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(3)-O(3) bond length is 1.28 Å. The C(3)-O(4) bond length is 1.26 Å. In the second C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.29 Å. There are four inequivalent H sites. In the first H site, H(4) is bonded in a single-bond geometry to one O(6) atom. The H(4)-O(6) bond length is 1.00 Å. In the second H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.99 Å. In the third H site, H(2) is bonded in a single-bond geometry to one O(5) atom. The H(2)-O(5) bond length is 0.99 Å. In the fourth H site, H(3) is bonded in a single-bond geometry to one O(6) atom. The H(3)-O(6) bond length is 1.00 Å. There are six inequivalent O sites. In the first O site, O(3) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(3) atom. In the second O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(3) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one Zn(1) and one C(1) atom. In the fourth O site, O(5) is bonded in a water-like geometry to one Ba(1), one H(1), and one H(2) atom. In the fifth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one Ba(1), one H(3), and one H(4) atom. Linkers: 8 [O]C(=O)CC([O])=O. Metal clusters: 4 [Ba] ,4 [Zn]. The MOF has largest included sphere 1.30 A, density 2.62 g/cm3, surface area 2511.29 m2/g, accessible volume 0.04 cm3/g