Ba3Sr(CO2)8 crystallizes in the triclinic P1 space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(14), one O(16), one O(5), and one O(8) atom. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(15), one O(2), one O(3), and one O(9) atom. In the third Ba site, Ba(3) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(12), one O(14), one O(16), and one O(4) atom. Sr(1) is bonded in a distorted pentagonal pyramidal geometry to one O(11), one O(13), one O(15), one O(6), one O(7), and one O(9) atom. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(9) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(2) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(12) and one O(4) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(3) atom. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(13) and one O(5) atom. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(14) and one O(6) atom. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one O(16) and one O(8) atom. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one O(15) and one O(7) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ba(3) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(2) and one C(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Ba(2) and one C(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ba(3) and one C(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1) and one C(5) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sr(1) and one C(6) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sr(1) and one C(8) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Ba(1) and one C(7) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Ba(2), one Sr(1), and one C(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(3), and one C(2) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Ba(2), one Sr(1), and one C(4) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(3), and one C(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Ba(2), one Sr(1), and one C(5) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(3), and one C(6) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one Ba(2), one Sr(1), and one C(8) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(3), and one C(7) atom.
Ba3Sr(CO2)8 crystallizes in the triclinic P1 space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(14), one O(16), one O(5), and one O(8) atom. The Ba(1)-O(10) bond length is 2.73 Å. The Ba(1)-O(12) bond length is 2.73 Å. The Ba(1)-O(14) bond length is 2.72 Å. The Ba(1)-O(16) bond length is 2.71 Å. The Ba(1)-O(5) bond length is 2.72 Å. The Ba(1)-O(8) bond length is 2.75 Å. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(15), one O(2), one O(3), and one O(9) atom. The Ba(2)-O(11) bond length is 2.72 Å. The Ba(2)-O(13) bond length is 2.75 Å. The Ba(2)-O(15) bond length is 2.79 Å. The Ba(2)-O(2) bond length is 2.71 Å. The Ba(2)-O(3) bond length is 2.75 Å. The Ba(2)-O(9) bond length is 2.72 Å. In the third Ba site, Ba(3) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(12), one O(14), one O(16), and one O(4) atom. The Ba(3)-O(1) bond length is 2.77 Å. The Ba(3)-O(10) bond length is 2.71 Å. The Ba(3)-O(12) bond length is 2.71 Å. The Ba(3)-O(14) bond length is 2.79 Å. The Ba(3)-O(16) bond length is 2.74 Å. The Ba(3)-O(4) bond length is 2.73 Å. Sr(1) is bonded in a distorted pentagonal pyramidal geometry to one O(11), one O(13), one O(15), one O(6), one O(7), and one O(9) atom. The Sr(1)-O(11) bond length is 2.51 Å. The Sr(1)-O(13) bond length is 2.66 Å. The Sr(1)-O(15) bond length is 2.67 Å. The Sr(1)-O(6) bond length is 2.59 Å. The Sr(1)-O(7) bond length is 2.57 Å. The Sr(1)-O(9) bond length is 2.51 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(9) atom. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(9) bond length is 1.28 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(2) atom. The C(2)-O(10) bond length is 1.27 Å. The C(2)-O(2) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(12) and one O(4) atom. The C(3)-O(12) bond length is 1.27 Å. The C(3)-O(4) bond length is 1.27 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(3) atom. The C(4)-O(11) bond length is 1.27 Å. The C(4)-O(3) bond length is 1.26 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(13) and one O(5) atom. The C(5)-O(13) bond length is 1.27 Å. The C(5)-O(5) bond length is 1.26 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(14) and one O(6) atom. The C(6)-O(14) bond length is 1.27 Å. The C(6)-O(6) bond length is 1.27 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one O(16) and one O(8) atom. The C(7)-O(16) bond length is 1.27 Å. The C(7)-O(8) bond length is 1.27 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one O(15) and one O(7) atom. The C(8)-O(15) bond length is 1.27 Å. The C(8)-O(7) bond length is 1.27 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ba(3) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(2) and one C(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Ba(2) and one C(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ba(3) and one C(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1) and one C(5) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sr(1) and one C(6) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sr(1) and one C(8) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Ba(1) and one C(7) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Ba(2), one Sr(1), and one C(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(3), and one C(2) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Ba(2), one Sr(1), and one C(4) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(3), and one C(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Ba(2), one Sr(1), and one C(5) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(3), and one C(6) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one Ba(2), one Sr(1), and one C(8) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(3), and one C(7) atom.