KFeO2 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Fe(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form a mixture of corner and edge-sharing FeO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to four equivalent K(1) and two equivalent Fe(1) atoms.
KFeO2 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Both K(1)-O(1) bond lengths are 2.58 Å. There are three shorter (2.98 Å) and one longer (3.03 Å) K(1)-O(2) bond length. Fe(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form a mixture of corner and edge-sharing FeO4 tetrahedra. Both Fe(1)-O(1) bond lengths are 1.91 Å. Both Fe(1)-O(2) bond lengths are 1.93 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to four equivalent K(1) and two equivalent Fe(1) atoms.