Eu2CuH4(SO6)2 crystallizes in the monoclinic P2_1/c space group. Eu(1) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. There are two 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(2) atom. S(1) is bonded in a tetrahedral geometry to one O(3), one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one S(1) atom. In the second O site, O(6) is bonded in a single-bond geometry to one S(1) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Eu(1), one Cu(1), and one H(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Eu(1), one Cu(1), and one H(2) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Eu(1) and one S(1) atom. In the sixth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and one S(1) atom.
Eu2CuH4(SO6)2 crystallizes in the monoclinic P2_1/c space group. Eu(1) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Eu(1)-O(5) bond length is 2.40 Å. There is one shorter (2.50 Å) and one longer (2.60 Å) Eu(1)-O(1) bond length. There is one shorter (2.64 Å) and one longer (2.65 Å) Eu(1)-O(2) bond length. There is one shorter (2.53 Å) and one longer (2.62 Å) Eu(1)-O(3) bond length. There is one shorter (2.44 Å) and one longer (2.54 Å) Eu(1)-O(4) bond length. Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 1.89 Å. Both Cu(1)-O(2) bond lengths are 1.90 Å. There are two 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 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(2) atom. The H(2)-O(2) bond length is 0.98 Å. S(1) is bonded in a tetrahedral geometry to one O(3), one O(4), one O(5), and one O(6) atom. The S(1)-O(3) bond length is 1.51 Å. The S(1)-O(4) bond length is 1.52 Å. The S(1)-O(5) bond length is 1.47 Å. The S(1)-O(6) bond length is 1.46 Å. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one S(1) atom. In the second O site, O(6) is bonded in a single-bond geometry to one S(1) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Eu(1), one Cu(1), and one H(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Eu(1), one Cu(1), and one H(2) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Eu(1) and one S(1) atom. In the sixth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and one S(1) atom.