K2PH3SeO8 crystallizes in the monoclinic Pc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(5), one O(6), one O(8), two equivalent O(2), two equivalent O(3), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(5), one O(6), one O(7), two equivalent O(1), two equivalent O(4), and two equivalent O(8) atoms. P(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(5), and one O(8) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(5) and one O(6) atom. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(4) atom. In the third H site, H(3) is bonded in a linear geometry to one O(1) and one O(2) atom. Se(1) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(6), and one O(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to two equivalent K(2), one P(1), and one H(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent K(1), one H(3), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent K(1), one H(2), and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent K(2), one P(1), and one H(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one P(1), and one H(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one H(1), and one Se(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Se(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one P(1) atom.
K2PH3SeO8 crystallizes in the monoclinic Pc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(5), one O(6), one O(8), two equivalent O(2), two equivalent O(3), and two equivalent O(7) atoms. The K(1)-O(5) bond length is 2.97 Å. The K(1)-O(6) bond length is 3.06 Å. The K(1)-O(8) bond length is 2.75 Å. There is one shorter (3.13 Å) and one longer (3.24 Å) K(1)-O(2) bond length. There is one shorter (2.93 Å) and one longer (2.99 Å) K(1)-O(3) bond length. There is one shorter (2.89 Å) and one longer (2.97 Å) K(1)-O(7) bond length. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(5), one O(6), one O(7), two equivalent O(1), two equivalent O(4), and two equivalent O(8) atoms. The K(2)-O(5) bond length is 3.07 Å. The K(2)-O(6) bond length is 2.88 Å. The K(2)-O(7) bond length is 2.77 Å. There is one shorter (2.98 Å) and one longer (3.06 Å) K(2)-O(1) bond length. There is one shorter (3.01 Å) and one longer (3.29 Å) K(2)-O(4) bond length. There is one shorter (2.90 Å) and one longer (2.98 Å) K(2)-O(8) bond length. P(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(5), and one O(8) atom. The P(1)-O(1) bond length is 1.58 Å. The P(1)-O(4) bond length is 1.59 Å. The P(1)-O(5) bond length is 1.58 Å. The P(1)-O(8) bond length is 1.50 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(5) and one O(6) atom. The H(1)-O(5) bond length is 1.04 Å. The H(1)-O(6) bond length is 1.50 Å. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(4) atom. The H(2)-O(3) bond length is 1.53 Å. The H(2)-O(4) bond length is 1.03 Å. In the third H site, H(3) is bonded in a linear geometry to one O(1) and one O(2) atom. The H(3)-O(1) bond length is 1.07 Å. The H(3)-O(2) bond length is 1.43 Å. Se(1) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(6), and one O(7) atom. The Se(1)-O(2) bond length is 1.69 Å. The Se(1)-O(3) bond length is 1.68 Å. The Se(1)-O(6) bond length is 1.69 Å. The Se(1)-O(7) bond length is 1.66 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to two equivalent K(2), one P(1), and one H(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent K(1), one H(3), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent K(1), one H(2), and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent K(2), one P(1), and one H(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one P(1), and one H(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one H(1), and one Se(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(1), and one Se(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one P(1) atom.