Rb2NiO2 crystallizes in the tetragonal I4/mmm space group. Rb(1) is bonded to five equivalent O(1) atoms to form a mixture of edge and corner-sharing RbO5 square pyramids. Ni(1) is bonded in a linear geometry to two equivalent O(1) atoms. O(1) is bonded to five equivalent Rb(1) and one Ni(1) atom to form a mixture of distorted edge and corner-sharing ORb5Ni octahedra. The corner-sharing octahedral tilt angles range from 0-12°.
Rb2NiO2 crystallizes in the tetragonal I4/mmm space group. Rb(1) is bonded to five equivalent O(1) atoms to form a mixture of edge and corner-sharing RbO5 square pyramids. There is one shorter (2.87 Å) and four longer (2.95 Å) Rb(1)-O(1) bond lengths. Ni(1) is bonded in a linear geometry to two equivalent O(1) atoms. Both Ni(1)-O(1) bond lengths are 1.69 Å. O(1) is bonded to five equivalent Rb(1) and one Ni(1) atom to form a mixture of distorted edge and corner-sharing ORb5Ni octahedra. The corner-sharing octahedral tilt angles range from 0-12°.