Y2(SeO4)3 crystallizes in the monoclinic C2/c space group. Y(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(6), two equivalent O(3), and two equivalent O(5) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(5), and one O(6) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to two equivalent O(2) and two equivalent O(3) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Y(1) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Y(1) and one Se(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Y(1) and one Se(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Y(1) and one Se(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Y(1) and one Se(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Y(1) and one Se(1) atom.
Y2(SeO4)3 crystallizes in the monoclinic C2/c space group. Y(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(6), two equivalent O(3), and two equivalent O(5) atoms. The Y(1)-O(1) bond length is 2.28 Å. The Y(1)-O(2) bond length is 2.37 Å. The Y(1)-O(4) bond length is 2.39 Å. The Y(1)-O(6) bond length is 2.33 Å. There is one shorter (2.51 Å) and one longer (2.53 Å) Y(1)-O(3) bond length. There is one shorter (2.41 Å) and one longer (2.57 Å) Y(1)-O(5) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(5), and one O(6) atom. The Se(1)-O(1) bond length is 1.67 Å. The Se(1)-O(4) bond length is 1.66 Å. The Se(1)-O(5) bond length is 1.71 Å. The Se(1)-O(6) bond length is 1.67 Å. In the second Se site, Se(2) is bonded in a tetrahedral geometry to two equivalent O(2) and two equivalent O(3) atoms. Both Se(2)-O(2) bond lengths are 1.66 Å. Both Se(2)-O(3) bond lengths are 1.70 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Y(1) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Y(1) and one Se(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Y(1) and one Se(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Y(1) and one Se(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Y(1) and one Se(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Y(1) and one Se(1) atom.