TmCO4 crystallizes in the tetragonal P4_2/nmc space group. Tm(1) is bonded to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms to form a mixture of distorted corner and edge-sharing TmO8 hexagonal bipyramids. C(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Tm(1) and one C(1) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Tm(1) atoms. In the third O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Tm(1) and one C(1) atom.
TmCO4 crystallizes in the tetragonal P4_2/nmc space group. Tm(1) is bonded to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms to form a mixture of distorted corner and edge-sharing TmO8 hexagonal bipyramids. Both Tm(1)-O(1) bond lengths are 2.20 Å. Both Tm(1)-O(2) bond lengths are 2.56 Å. There are two shorter (2.31 Å) and two longer (2.35 Å) Tm(1)-O(3) bond lengths. C(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(3) atoms. The C(1)-O(2) bond length is 1.29 Å. Both C(1)-O(3) bond lengths are 1.29 Å. There are three inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Tm(1) and one C(1) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Tm(1) atoms. In the third O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Tm(1) and one C(1) atom.