NaPr(SeO4)2 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom. Pr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), 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(2), one O(3), one O(5), and one O(6) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Pr(1) and one Se(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Na(1), one Pr(1), and one Se(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(2) atom.
NaPr(SeO4)2 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom. The Na(1)-O(1) bond length is 2.87 Å. The Na(1)-O(2) bond length is 2.61 Å. The Na(1)-O(3) bond length is 2.43 Å. The Na(1)-O(4) bond length is 2.55 Å. The Na(1)-O(6) bond length is 2.49 Å. The Na(1)-O(7) bond length is 2.54 Å. The Na(1)-O(8) bond length is 2.93 Å. Pr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), and two equivalent O(5) atoms. The Pr(1)-O(1) bond length is 2.42 Å. The Pr(1)-O(2) bond length is 2.84 Å. The Pr(1)-O(3) bond length is 2.59 Å. The Pr(1)-O(4) bond length is 2.46 Å. The Pr(1)-O(6) bond length is 2.60 Å. The Pr(1)-O(7) bond length is 2.57 Å. The Pr(1)-O(8) bond length is 2.51 Å. There is one shorter (2.56 Å) and one longer (2.64 Å) Pr(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(2), one O(3), one O(5), and one O(6) atom. The Se(1)-O(2) bond length is 1.66 Å. The Se(1)-O(3) bond length is 1.67 Å. The Se(1)-O(5) bond length is 1.70 Å. The Se(1)-O(6) bond length is 1.68 Å. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(7), and one O(8) atom. The Se(2)-O(1) bond length is 1.66 Å. The Se(2)-O(4) bond length is 1.67 Å. The Se(2)-O(7) bond length is 1.67 Å. The Se(2)-O(8) bond length is 1.67 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Pr(1) and one Se(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Na(1), one Pr(1), and one Se(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Na(1), one Pr(1), and one Se(2) atom.