BaCu2Ge3(HO5)2 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(5), and four equivalent O(3) atoms. Cu(1) is bonded in a distorted square co-planar geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(4), and two equivalent O(3) atoms to form GeO4 tetrahedra that share corners with two equivalent Ge(2)O6 octahedra and  a cornercorner with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 55°. In the second Ge site, Ge(2) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form corner-sharing GeO6 octahedra. H(1) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Ba(1), two equivalent Cu(1), and one Ge(1) atom to form distorted corner-sharing OBaCu2Ge tetrahedra. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to two equivalent Cu(1) and one Ge(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Cu(1), one Ge(1), and one Ge(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Ge(1) atoms. In the fifth O site, O(5) is bonded in a water-like geometry to two equivalent Ba(1) and two equivalent H(1) atoms.
BaCu2Ge3(HO5)2 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(5), and four equivalent O(3) atoms. Both Ba(1)-O(1) bond lengths are 2.84 Å. Both Ba(1)-O(5) bond lengths are 3.01 Å. All Ba(1)-O(3) bond lengths are 2.84 Å. Cu(1) is bonded in a distorted square co-planar geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Cu(1)-O(1) bond lengths are 2.01 Å. Both Cu(1)-O(2) bond lengths are 1.94 Å. Both Cu(1)-O(3) bond lengths are 2.58 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(4), and two equivalent O(3) atoms to form GeO4 tetrahedra that share corners with two equivalent Ge(2)O6 octahedra and  a cornercorner with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 55°. The Ge(1)-O(1) bond length is 1.78 Å. The Ge(1)-O(4) bond length is 1.76 Å. Both Ge(1)-O(3) bond lengths are 1.77 Å. In the second Ge site, Ge(2) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form corner-sharing GeO6 octahedra. Both Ge(2)-O(2) bond lengths are 1.89 Å. All Ge(2)-O(3) bond lengths are 1.96 Å. H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 1.00 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Ba(1), two equivalent Cu(1), and one Ge(1) atom to form distorted corner-sharing OBaCu2Ge tetrahedra. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to two equivalent Cu(1) and one Ge(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Cu(1), one Ge(1), and one Ge(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Ge(1) atoms. In the fifth O site, O(5) is bonded in a water-like geometry to two equivalent Ba(1) and two equivalent H(1) atoms.