LiSrEu(CoO3)2 crystallizes in the triclinic P1 space group. Li(1) is bonded in a 4-coordinate geometry to one O(4), two equivalent O(2), and two equivalent O(6) atoms. Sr(1) is bonded in a 9-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(5), and four equivalent O(4) atoms. Eu(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(5), two equivalent O(6), and four equivalent O(3) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with four equivalent Co(1)O6 octahedra and  a cornercorner with one Co(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 9-17°. In the second Co site, Co(2) is bonded to one O(3), two equivalent O(2), and two equivalent O(6) atoms to form distorted CoO5 trigonal bipyramids that share  a cornercorner with one Co(1)O6 octahedra and corners with four equivalent Co(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 3°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Sr(1), two equivalent Eu(1), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Li(1), one Sr(1), and two equivalent Co(2) atoms. In the third O site, O(3) is bonded to four equivalent Eu(1), one Co(1), and one Co(2) atom to form distorted OEu4Co2 octahedra that share  a cornercorner with one O(4)Sr4LiCo octahedra, corners with four equivalent O(3)Eu4Co2 octahedra, corners with four equivalent O(5)Sr2Eu2Co2 octahedra, edges with four equivalent O(3)Eu4Co2 octahedra, and faces with two equivalent O(5)Sr2Eu2Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-57°. In the fourth O site, O(4) is bonded to one Li(1), four equivalent Sr(1), and one Co(1) atom to form distorted OSr4LiCo octahedra that share  a cornercorner with one O(3)Eu4Co2 octahedra, corners with four equivalent O(5)Sr2Eu2Co2 octahedra, corners with four equivalent O(4)Sr4LiCo octahedra, edges with four equivalent O(4)Sr4LiCo octahedra, and faces with two equivalent O(5)Sr2Eu2Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-59°. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent Eu(1), and two equivalent Co(1) atoms to form OSr2Eu2Co2 octahedra that share corners with two equivalent O(5)Sr2Eu2Co2 octahedra, corners with four equivalent O(3)Eu4Co2 octahedra, corners with four equivalent O(4)Sr4LiCo octahedra, edges with two equivalent O(5)Sr2Eu2Co2 octahedra, faces with two equivalent O(3)Eu4Co2 octahedra, and faces with two equivalent O(4)Sr4LiCo octahedra. The corner-sharing octahedral tilt angles range from 9-59°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Li(1), two equivalent Eu(1), and two equivalent Co(2) atoms.
LiSrEu(CoO3)2 crystallizes in the triclinic P1 space group. Li(1) is bonded in a 4-coordinate geometry to one O(4), two equivalent O(2), and two equivalent O(6) atoms. The Li(1)-O(4) bond length is 2.02 Å. Both Li(1)-O(2) bond lengths are 2.04 Å. There is one shorter (1.97 Å) and one longer (2.59 Å) Li(1)-O(6) bond length. Sr(1) is bonded in a 9-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(5), and four equivalent O(4) atoms. The Sr(1)-O(2) bond length is 2.69 Å. There is one shorter (2.81 Å) and one longer (2.83 Å) Sr(1)-O(1) bond length. There is one shorter (2.61 Å) and one longer (2.65 Å) Sr(1)-O(5) bond length. There are a spread of Sr(1)-O(4) bond distances ranging from 2.67-2.73 Å. Eu(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(5), two equivalent O(6), and four equivalent O(3) atoms. There is one shorter (2.53 Å) and one longer (2.58 Å) Eu(1)-O(1) bond length. There is one shorter (2.51 Å) and one longer (2.52 Å) Eu(1)-O(5) bond length. There is one shorter (2.57 Å) and one longer (2.87 Å) Eu(1)-O(6) bond length. There are a spread of Eu(1)-O(3) bond distances ranging from 2.67-2.74 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with four equivalent Co(1)O6 octahedra and  a cornercorner with one Co(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 9-17°. The Co(1)-O(3) bond length is 2.13 Å. The Co(1)-O(4) bond length is 1.91 Å. There is one shorter (1.84 Å) and one longer (1.85 Å) Co(1)-O(1) bond length. Both Co(1)-O(5) bond lengths are 1.99 Å. In the second Co site, Co(2) is bonded to one O(3), two equivalent O(2), and two equivalent O(6) atoms to form distorted CoO5 trigonal bipyramids that share  a cornercorner with one Co(1)O6 octahedra and corners with four equivalent Co(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 3°. The Co(2)-O(3) bond length is 1.86 Å. There is one shorter (1.84 Å) and one longer (2.28 Å) Co(2)-O(2) bond length. Both Co(2)-O(6) bond lengths are 2.00 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Sr(1), two equivalent Eu(1), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Li(1), one Sr(1), and two equivalent Co(2) atoms. In the third O site, O(3) is bonded to four equivalent Eu(1), one Co(1), and one Co(2) atom to form distorted OEu4Co2 octahedra that share  a cornercorner with one O(4)Sr4LiCo octahedra, corners with four equivalent O(3)Eu4Co2 octahedra, corners with four equivalent O(5)Sr2Eu2Co2 octahedra, edges with four equivalent O(3)Eu4Co2 octahedra, and faces with two equivalent O(5)Sr2Eu2Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-57°. In the fourth O site, O(4) is bonded to one Li(1), four equivalent Sr(1), and one Co(1) atom to form distorted OSr4LiCo octahedra that share  a cornercorner with one O(3)Eu4Co2 octahedra, corners with four equivalent O(5)Sr2Eu2Co2 octahedra, corners with four equivalent O(4)Sr4LiCo octahedra, edges with four equivalent O(4)Sr4LiCo octahedra, and faces with two equivalent O(5)Sr2Eu2Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-59°. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent Eu(1), and two equivalent Co(1) atoms to form OSr2Eu2Co2 octahedra that share corners with two equivalent O(5)Sr2Eu2Co2 octahedra, corners with four equivalent O(3)Eu4Co2 octahedra, corners with four equivalent O(4)Sr4LiCo octahedra, edges with two equivalent O(5)Sr2Eu2Co2 octahedra, faces with two equivalent O(3)Eu4Co2 octahedra, and faces with two equivalent O(4)Sr4LiCo octahedra. The corner-sharing octahedral tilt angles range from 9-59°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Li(1), two equivalent Eu(1), and two equivalent Co(2) atoms.