TmCu(BO2)5 crystallizes in the orthorhombic Ibam space group. Tm(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Cu(1) is bonded in an octahedral geometry to two equivalent O(3) and four equivalent O(1) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. In the second B site, B(2) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(2) is bonded in a 2-coordinate geometry to one Tm(1), one B(1), and one B(2) atom. In the second O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and two equivalent B(1) atoms. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Tm(1), one Cu(1), and one B(1) atom.
TmCu(BO2)5 crystallizes in the orthorhombic Ibam space group. Tm(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Tm(1)-O(1) bond lengths are 2.23 Å. All Tm(1)-O(2) bond lengths are 2.49 Å. Cu(1) is bonded in an octahedral geometry to two equivalent O(3) and four equivalent O(1) atoms. Both Cu(1)-O(3) bond lengths are 2.47 Å. All Cu(1)-O(1) bond lengths are 2.00 Å. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The B(1)-O(1) bond length is 1.36 Å. The B(1)-O(2) bond length is 1.40 Å. The B(1)-O(3) bond length is 1.39 Å. In the second B site, B(2) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. All B(2)-O(2) bond lengths are 1.48 Å. There are three inequivalent O sites. In the first O site, O(2) is bonded in a 2-coordinate geometry to one Tm(1), one B(1), and one B(2) atom. In the second O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and two equivalent B(1) atoms. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Tm(1), one Cu(1), and one B(1) atom.