Y2C3O11 crystallizes in the orthorhombic Cmc2_1 space group. Y(1) is bonded in a 9-coordinate geometry to one O(4), one O(5), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(4) and two equivalent O(5) atoms. There are six inequivalent O sites. In the first O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Y(1) and one C(2) atom. In the second O site, O(5) is bonded in a distorted L-shaped geometry to one Y(1) and one C(2) atom. In the third O site, O(6) is bonded in a single-bond geometry to one Y(1) atom. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Y(1) and one C(1) atom. In the fifth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Y(1) and one C(1) atom. In the sixth O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Y(1) and one C(1) atom.
Y2C3O11 crystallizes in the orthorhombic Cmc2_1 space group. Y(1) is bonded in a 9-coordinate geometry to one O(4), one O(5), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. The Y(1)-O(4) bond length is 2.38 Å. The Y(1)-O(5) bond length is 2.39 Å. The Y(1)-O(6) bond length is 2.40 Å. There is one shorter (2.39 Å) and one longer (2.51 Å) Y(1)-O(1) bond length. There is one shorter (2.43 Å) and one longer (2.44 Å) Y(1)-O(2) bond length. There is one shorter (2.39 Å) and one longer (2.45 Å) Y(1)-O(3) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.30 Å. The C(1)-O(3) bond length is 1.29 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(4) and two equivalent O(5) atoms. The C(2)-O(4) bond length is 1.36 Å. Both C(2)-O(5) bond lengths are 1.27 Å. There are six inequivalent O sites. In the first O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Y(1) and one C(2) atom. In the second O site, O(5) is bonded in a distorted L-shaped geometry to one Y(1) and one C(2) atom. In the third O site, O(6) is bonded in a single-bond geometry to one Y(1) atom. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Y(1) and one C(1) atom. In the fifth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Y(1) and one C(1) atom. In the sixth O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Y(1) and one C(1) atom.