Rb2CuH4(C2O5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to one H(3), one O(1), one O(2), one O(5), one O(7), one O(9), two equivalent O(10), and two equivalent O(4) atoms. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(5), and two equivalent O(6) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(3) atoms. In the second Cu site, Cu(2) is bonded in an octahedral geometry to two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(9) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(9) atom. In the third H site, H(3) is bonded in a single-bond geometry to one Rb(1) and one O(10) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(10) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Rb(1), one Cu(1), and one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Rb(1), one Rb(2), and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one C(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(2), one Cu(2), and one C(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(2) and one C(3) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Rb(1), one Cu(2), and one C(4) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one C(4) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one Rb(1), one Cu(2), one H(1), and one H(2) atom. In the tenth O site, O(10) is bonded in a water-like geometry to two equivalent Rb(1), one H(3), and one H(4) atom.
Rb2CuH4(C2O5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to one H(3), one O(1), one O(2), one O(5), one O(7), one O(9), two equivalent O(10), and two equivalent O(4) atoms. The Rb(1)-H(3) bond length is 3.03 Å. The Rb(1)-O(1) bond length is 3.07 Å. The Rb(1)-O(2) bond length is 3.21 Å. The Rb(1)-O(5) bond length is 3.08 Å. The Rb(1)-O(7) bond length is 2.99 Å. The Rb(1)-O(9) bond length is 3.05 Å. There is one shorter (2.93 Å) and one longer (2.97 Å) Rb(1)-O(10) bond length. There is one shorter (3.05 Å) and one longer (3.56 Å) Rb(1)-O(4) bond length. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(5), and two equivalent O(6) atoms. The Rb(2)-O(2) bond length is 2.98 Å. The Rb(2)-O(4) bond length is 2.92 Å. The Rb(2)-O(5) bond length is 3.02 Å. There is one shorter (2.91 Å) and one longer (2.98 Å) Rb(2)-O(6) bond length. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(3) atoms. Both Cu(1)-O(1) bond lengths are 1.97 Å. Both Cu(1)-O(3) bond lengths are 1.97 Å. In the second Cu site, Cu(2) is bonded in an octahedral geometry to two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms. Both Cu(2)-O(5) bond lengths are 1.97 Å. Both Cu(2)-O(7) bond lengths are 1.98 Å. Both Cu(2)-O(9) bond lengths are 2.46 Å. There are four inequivalent C sites. In the first 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 1.29 Å. The C(1)-O(2) bond length is 1.26 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(2)-O(3) bond length is 1.30 Å. The C(2)-O(4) bond length is 1.25 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(3)-O(5) bond length is 1.30 Å. The C(3)-O(6) bond length is 1.25 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(4)-O(7) bond length is 1.29 Å. The C(4)-O(8) bond length is 1.26 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(9) atom. The H(1)-O(9) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(9) atom. The H(2)-O(9) bond length is 0.98 Å. In the third H site, H(3) is bonded in a single-bond geometry to one Rb(1) and one O(10) atom. The H(3)-O(10) bond length is 0.99 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(10) atom. The H(4)-O(10) bond length is 0.99 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Rb(1), one Cu(1), and one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Rb(1), one Rb(2), and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one C(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(2), one Cu(2), and one C(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(2) and one C(3) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Rb(1), one Cu(2), and one C(4) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one C(4) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one Rb(1), one Cu(2), one H(1), and one H(2) atom. In the tenth O site, O(10) is bonded in a water-like geometry to two equivalent Rb(1), one H(3), and one H(4) atom.