Ba(BO2)5 crystallizes in the triclinic P-1 space group. Ba(1) is bonded in a 10-coordinate geometry to one O(10), one O(4), one O(6), one O(8), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. There are five inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(7), and one O(9) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(2), one O(6), and one O(8) atom. In the fourth B site, B(4) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form corner-sharing BO4 tetrahedra. In the fifth B site, B(5) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form corner-sharing BO4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one B(1) and one B(4) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one B(3), and one B(5) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent Ba(1), one B(4), and one B(5) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one B(2), and one B(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one B(2), and one B(5) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one B(2), and one B(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one B(1) and one B(5) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one B(3), and one B(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one B(1) and one O(10) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Ba(1) and one O(9) atom.
Ba(BO2)5 crystallizes in the triclinic P-1 space group. Ba(1) is bonded in a 10-coordinate geometry to one O(10), one O(4), one O(6), one O(8), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. The Ba(1)-O(10) bond length is 2.93 Å. The Ba(1)-O(4) bond length is 2.67 Å. The Ba(1)-O(6) bond length is 2.65 Å. The Ba(1)-O(8) bond length is 2.68 Å. There is one shorter (2.94 Å) and one longer (3.05 Å) Ba(1)-O(2) bond length. There is one shorter (2.90 Å) and one longer (3.06 Å) Ba(1)-O(3) bond length. There is one shorter (2.98 Å) and one longer (3.04 Å) Ba(1)-O(5) bond length. There are five inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(7), and one O(9) atom. The B(1)-O(1) bond length is 1.34 Å. The B(1)-O(7) bond length is 1.35 Å. The B(1)-O(9) bond length is 1.47 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. The B(2)-O(4) bond length is 1.36 Å. The B(2)-O(5) bond length is 1.37 Å. The B(2)-O(6) bond length is 1.41 Å. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(2), one O(6), and one O(8) atom. The B(3)-O(2) bond length is 1.38 Å. The B(3)-O(6) bond length is 1.39 Å. The B(3)-O(8) bond length is 1.37 Å. In the fourth B site, B(4) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form corner-sharing BO4 tetrahedra. The B(4)-O(1) bond length is 1.47 Å. The B(4)-O(3) bond length is 1.47 Å. The B(4)-O(4) bond length is 1.51 Å. The B(4)-O(8) bond length is 1.50 Å. In the fifth B site, B(5) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form corner-sharing BO4 tetrahedra. The B(5)-O(2) bond length is 1.51 Å. The B(5)-O(3) bond length is 1.47 Å. The B(5)-O(5) bond length is 1.52 Å. The B(5)-O(7) bond length is 1.45 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one B(1) and one B(4) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one B(3), and one B(5) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent Ba(1), one B(4), and one B(5) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one B(2), and one B(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one B(2), and one B(5) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one B(2), and one B(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one B(1) and one B(5) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one B(3), and one B(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one B(1) and one O(10) atom. The O(9)-O(10) bond length is 1.35 Å. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Ba(1) and one O(9) atom.