KEr(MoO4)2 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 12-coordinate geometry to two equivalent O(2), two equivalent O(3), four equivalent O(1), and four equivalent O(4) atoms. Er(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. Mo(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and two equivalent Mo(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), two equivalent Er(1), and one Mo(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Er(1), and two equivalent Mo(1) atoms. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Er(1), and one Mo(1) atom.
KEr(MoO4)2 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 12-coordinate geometry to two equivalent O(2), two equivalent O(3), four equivalent O(1), and four equivalent O(4) atoms. Both K(1)-O(2) bond lengths are 3.17 Å. Both K(1)-O(3) bond lengths are 3.06 Å. There are two shorter (2.71 Å) and two longer (2.72 Å) K(1)-O(1) bond lengths. There are two shorter (2.97 Å) and two longer (3.24 Å) K(1)-O(4) bond lengths. Er(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. Both Er(1)-O(3) bond lengths are 2.24 Å. Both Er(1)-O(4) bond lengths are 2.25 Å. There are two shorter (2.33 Å) and two longer (2.61 Å) Er(1)-O(2) bond lengths. Mo(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. The Mo(1)-O(2) bond length is 1.82 Å. The Mo(1)-O(4) bond length is 1.77 Å. There is one shorter (1.75 Å) and one longer (2.45 Å) Mo(1)-O(1) bond length. There is one shorter (1.95 Å) and one longer (2.11 Å) Mo(1)-O(3) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and two equivalent Mo(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), two equivalent Er(1), and one Mo(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Er(1), and two equivalent Mo(1) atoms. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Er(1), and one Mo(1) atom.