K2SeO4.Te(OH)6 crystallizes in the monoclinic Cc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(5), one O(7), and one O(8) atom. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. There are six inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(1) and one O(10) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(4) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(5) atom. In the sixth H site, H(6) is bonded in a distorted linear geometry to one O(6) and one O(7) atom. Te(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. Se(1) is bonded in a tetrahedral geometry to one O(10), one O(7), one O(8), and one O(9) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one K(1), one H(1), and one Te(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), one H(2), and one Te(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one K(1), one H(3), and one Te(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one K(2), one H(4), and one Te(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), one H(5), and one Te(1) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one K(2), one H(6), and one Te(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one K(1), one K(2), one H(6), and one Se(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1) and one Se(1) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(2) and one Se(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one K(1), one H(1), and one Se(1) atom.
K2SeO4.Te(OH)6 crystallizes in the monoclinic Cc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(5), one O(7), and one O(8) atom. The K(1)-O(1) bond length is 2.87 Å. The K(1)-O(10) bond length is 2.82 Å. The K(1)-O(2) bond length is 2.92 Å. The K(1)-O(3) bond length is 2.94 Å. The K(1)-O(5) bond length is 3.04 Å. The K(1)-O(7) bond length is 3.11 Å. The K(1)-O(8) bond length is 2.81 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. The K(2)-O(2) bond length is 3.08 Å. The K(2)-O(4) bond length is 2.84 Å. The K(2)-O(5) bond length is 3.00 Å. The K(2)-O(6) bond length is 2.90 Å. The K(2)-O(7) bond length is 2.81 Å. The K(2)-O(9) bond length is 2.79 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one O(1) and one O(10) atom. The H(1)-O(1) bond length is 1.01 Å. The H(1)-O(10) bond length is 1.64 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(2) atom. The H(2)-O(2) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(3) atom. The H(3)-O(3) bond length is 1.00 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(4) atom. The H(4)-O(4) bond length is 1.00 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(5) atom. The H(5)-O(5) bond length is 1.00 Å. In the sixth H site, H(6) is bonded in a distorted linear geometry to one O(6) and one O(7) atom. The H(6)-O(6) bond length is 1.01 Å. The H(6)-O(7) bond length is 1.66 Å. Te(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Te(1)-O(1) bond length is 1.95 Å. The Te(1)-O(2) bond length is 1.97 Å. The Te(1)-O(3) bond length is 1.96 Å. The Te(1)-O(4) bond length is 1.96 Å. The Te(1)-O(5) bond length is 1.96 Å. The Te(1)-O(6) bond length is 1.95 Å. Se(1) is bonded in a tetrahedral geometry to one O(10), one O(7), one O(8), and one O(9) atom. The Se(1)-O(10) bond length is 1.67 Å. The Se(1)-O(7) bond length is 1.67 Å. The Se(1)-O(8) bond length is 1.68 Å. The Se(1)-O(9) bond length is 1.69 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one K(1), one H(1), and one Te(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), one H(2), and one Te(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one K(1), one H(3), and one Te(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one K(2), one H(4), and one Te(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), one H(5), and one Te(1) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one K(2), one H(6), and one Te(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one K(1), one K(2), one H(6), and one Se(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1) and one Se(1) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(2) and one Se(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one K(1), one H(1), and one Se(1) atom.