NaEu(CoO3)4 crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded in a 12-coordinate geometry to two equivalent O(2), two equivalent O(3), four equivalent O(1), and four equivalent O(5) atoms. Eu(1) is bonded in a 10-coordinate geometry to two equivalent O(2), four equivalent O(1), and four equivalent O(4) atoms. Co(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 16-26°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Eu(1), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Eu(1), and two equivalent Co(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Na(1) and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Eu(1) and two equivalent Co(1) atoms. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Na(1) and two equivalent Co(1) atoms.
NaEu(CoO3)4 crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded in a 12-coordinate geometry to two equivalent O(2), two equivalent O(3), four equivalent O(1), and four equivalent O(5) atoms. Both Na(1)-O(2) bond lengths are 2.70 Å. Both Na(1)-O(3) bond lengths are 2.34 Å. All Na(1)-O(1) bond lengths are 2.88 Å. There are two shorter (2.35 Å) and two longer (2.88 Å) Na(1)-O(5) bond lengths. Eu(1) is bonded in a 10-coordinate geometry to two equivalent O(2), four equivalent O(1), and four equivalent O(4) atoms. Both Eu(1)-O(2) bond lengths are 2.54 Å. All Eu(1)-O(1) bond lengths are 2.39 Å. There are two shorter (2.49 Å) and two longer (2.76 Å) Eu(1)-O(4) bond lengths. Co(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 16-26°. The Co(1)-O(2) bond length is 1.88 Å. The Co(1)-O(3) bond length is 1.85 Å. The Co(1)-O(4) bond length is 1.97 Å. The Co(1)-O(5) bond length is 1.84 Å. There is one shorter (1.89 Å) and one longer (1.92 Å) Co(1)-O(1) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Eu(1), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Eu(1), and two equivalent Co(1) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Na(1) and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Eu(1) and two equivalent Co(1) atoms. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Na(1) and two equivalent Co(1) atoms.