(KCr(CO3)4)2O2 crystallizes in the monoclinic P2/c space group. The structure consists of two water atoms inside a KCr(CO3)4 framework. In the KCr(CO3)4 framework, K(1) is bonded in a distorted pentagonal pyramidal geometry to two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. Cr(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. There are two 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(3) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(4) atom. There are six inequivalent O sites. In the first O site, O(6) is bonded in a bent 120 degrees geometry to one K(1) and one O(5) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Cr(1) and one C(1) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Cr(1) and one C(2) atom. In the fourth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1) and one C(1) atom. In the fifth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one K(1) and one C(2) atom. In the sixth O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(1) and one O(6) atom.
(KCr(CO3)4)2O2 crystallizes in the monoclinic P2/c space group. The structure consists of two water atoms inside a KCr(CO3)4 framework. In the KCr(CO3)4 framework, K(1) is bonded in a distorted pentagonal pyramidal geometry to two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. Both K(1)-O(3) bond lengths are 2.76 Å. Both K(1)-O(4) bond lengths are 2.73 Å. Both K(1)-O(6) bond lengths are 3.20 Å. Cr(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. Both Cr(1)-O(1) bond lengths are 1.97 Å. Both Cr(1)-O(2) bond lengths are 1.98 Å. Both Cr(1)-O(5) bond lengths are 2.23 Å. There are two 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(3) atom. The C(1)-O(1) bond length is 1.29 Å. The C(1)-O(3) bond length is 1.24 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(4) atom. The C(2)-O(2) bond length is 1.30 Å. The C(2)-O(4) bond length is 1.23 Å. There are six inequivalent O sites. In the first O site, O(6) is bonded in a bent 120 degrees geometry to one K(1) and one O(5) atom. The O(6)-O(5) bond length is 1.25 Å. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Cr(1) and one C(1) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Cr(1) and one C(2) atom. In the fourth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1) and one C(1) atom. In the fifth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one K(1) and one C(2) atom. In the sixth O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(1) and one O(6) atom.