Tm2CuO4 crystallizes in the monoclinic P2_1/c space group. Tm(1) is bonded in a 7-coordinate geometry to three equivalent O(1) and four equivalent O(2) atoms. Cu(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent Tm(1) and two equivalent Cu(1) atoms. In the second O site, O(2) is bonded to four equivalent Tm(1) atoms to form a mixture of corner and edge-sharing OTm4 tetrahedra.
Tm2CuO4 crystallizes in the monoclinic P2_1/c space group. Tm(1) is bonded in a 7-coordinate geometry to three equivalent O(1) and four equivalent O(2) atoms. There are a spread of Tm(1)-O(1) bond distances ranging from 2.35-2.60 Å. There are a spread of Tm(1)-O(2) bond distances ranging from 2.19-2.25 Å. Cu(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. There are two shorter (1.98 Å) and two longer (1.99 Å) Cu(1)-O(1) bond lengths. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent Tm(1) and two equivalent Cu(1) atoms. In the second O site, O(2) is bonded to four equivalent Tm(1) atoms to form a mixture of corner and edge-sharing OTm4 tetrahedra.