Na2MgCuO2 crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. Mg(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. Cu(1) is bonded in a distorted water-like geometry to two equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Na(1), two equivalent Na(2), one Mg(1), and two equivalent Cu(1) atoms. In the second O site, O(2) is bonded to two equivalent Na(1), two equivalent Na(2), and two equivalent Mg(1) atoms to form a mixture of distorted edge and corner-sharing ONa4Mg2 octahedra. The corner-sharing octahedral tilt angles are 36°.
Na2MgCuO2 crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. There is one shorter (2.45 Å) and one longer (2.49 Å) Na(1)-O(1) bond length. There is one shorter (2.49 Å) and one longer (2.52 Å) Na(1)-O(2) bond length. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. There is one shorter (2.38 Å) and one longer (2.78 Å) Na(2)-O(1) bond length. Both Na(2)-O(2) bond lengths are 2.31 Å. Mg(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. The Mg(1)-O(1) bond length is 2.04 Å. Both Mg(1)-O(2) bond lengths are 1.98 Å. Cu(1) is bonded in a distorted water-like geometry to two equivalent O(1) atoms. Both Cu(1)-O(1) bond lengths are 2.08 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Na(1), two equivalent Na(2), one Mg(1), and two equivalent Cu(1) atoms. In the second O site, O(2) is bonded to two equivalent Na(1), two equivalent Na(2), and two equivalent Mg(1) atoms to form a mixture of distorted edge and corner-sharing ONa4Mg2 octahedra. The corner-sharing octahedral tilt angles are 36°.