(K7(SeO4)4)2N2 crystallizes in the monoclinic Pm space group. The structure consists of one ammonia atom inside a K7(SeO4)4 framework. In the K7(SeO4)4 framework, there are seven inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(9), two equivalent O(11), two equivalent O(7), and two equivalent O(8) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(2), two equivalent O(12), two equivalent O(7), and two equivalent O(8) atoms. In the third K site, K(3) is bonded in a 9-coordinate geometry to one O(11), one O(3), one O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(9) atoms. In the fourth K site, K(4) is bonded in a 9-coordinate geometry to one O(12), one O(3), one O(4), two equivalent O(10), two equivalent O(5), and two equivalent O(6) atoms. In the fifth K site, K(5) is bonded in a 9-coordinate geometry to one O(9), two equivalent O(3), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the sixth K site, K(6) is bonded in a 10-coordinate geometry to one O(12), one O(4), two equivalent O(2), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. In the seventh K site, K(7) is bonded in a 9-coordinate geometry to one O(11), two equivalent O(1), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(1), one O(9), and two equivalent O(5) atoms. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(10), one O(2), and two equivalent O(6) atoms. In the third Se site, Se(3) is bonded in a tetrahedral geometry to one O(11), one O(3), and two equivalent O(7) atoms. In the fourth Se site, Se(4) is bonded in a tetrahedral geometry to one O(12), one O(4), and two equivalent O(8) atoms. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one K(1), one K(2), two equivalent K(7), and one Se(1) atom. In the second O site, O(2) is bonded to one K(1), one K(2), two equivalent K(6), and one Se(2) atom to form distorted corner-sharing OK4Se square pyramids. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(3), one K(4), two equivalent K(5), and one Se(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(3), one K(4), one K(6), and one Se(4) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one K(3), one K(4), one K(5), one K(7), and one Se(1) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one K(3), one K(4), one K(5), one K(6), and one Se(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(5), one K(6), one K(7), and one Se(3) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(6), one K(7), and one Se(4) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one K(1), one K(5), two equivalent K(3), and one Se(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(4), and one Se(2) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one K(3), one K(7), two equivalent K(1), and one Se(3) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one K(4), one K(6), two equivalent K(2), and one Se(4) atom.
(K7(SeO4)4)2N2 crystallizes in the monoclinic Pm space group. The structure consists of one ammonia atom inside a K7(SeO4)4 framework. In the K7(SeO4)4 framework, there are seven inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(9), two equivalent O(11), two equivalent O(7), and two equivalent O(8) atoms. The K(1)-O(1) bond length is 2.78 Å. The K(1)-O(2) bond length is 2.78 Å. The K(1)-O(9) bond length is 3.12 Å. Both K(1)-O(11) bond lengths are 3.30 Å. Both K(1)-O(7) bond lengths are 2.90 Å. Both K(1)-O(8) bond lengths are 2.77 Å. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(2), two equivalent O(12), two equivalent O(7), and two equivalent O(8) atoms. The K(2)-O(1) bond length is 2.85 Å. The K(2)-O(10) bond length is 3.04 Å. The K(2)-O(2) bond length is 2.81 Å. Both K(2)-O(12) bond lengths are 3.29 Å. Both K(2)-O(7) bond lengths are 2.85 Å. Both K(2)-O(8) bond lengths are 2.81 Å. In the third K site, K(3) is bonded in a 9-coordinate geometry to one O(11), one O(3), one O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(9) atoms. The K(3)-O(11) bond length is 3.21 Å. The K(3)-O(3) bond length is 2.88 Å. The K(3)-O(4) bond length is 2.75 Å. Both K(3)-O(5) bond lengths are 2.93 Å. Both K(3)-O(6) bond lengths are 2.80 Å. Both K(3)-O(9) bond lengths are 3.34 Å. In the fourth K site, K(4) is bonded in a 9-coordinate geometry to one O(12), one O(3), one O(4), two equivalent O(10), two equivalent O(5), and two equivalent O(6) atoms. The K(4)-O(12) bond length is 3.02 Å. The K(4)-O(3) bond length is 2.92 Å. The K(4)-O(4) bond length is 2.87 Å. Both K(4)-O(10) bond lengths are 3.29 Å. Both K(4)-O(5) bond lengths are 2.77 Å. Both K(4)-O(6) bond lengths are 2.91 Å. In the fifth K site, K(5) is bonded in a 9-coordinate geometry to one O(9), two equivalent O(3), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. The K(5)-O(9) bond length is 2.71 Å. Both K(5)-O(3) bond lengths are 3.03 Å. Both K(5)-O(5) bond lengths are 3.28 Å. Both K(5)-O(6) bond lengths are 3.30 Å. Both K(5)-O(7) bond lengths are 2.99 Å. In the sixth K site, K(6) is bonded in a 10-coordinate geometry to one O(12), one O(4), two equivalent O(2), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. The K(6)-O(12) bond length is 2.75 Å. The K(6)-O(4) bond length is 3.24 Å. Both K(6)-O(2) bond lengths are 3.03 Å. Both K(6)-O(6) bond lengths are 2.96 Å. Both K(6)-O(7) bond lengths are 3.40 Å. Both K(6)-O(8) bond lengths are 3.34 Å. In the seventh K site, K(7) is bonded in a 9-coordinate geometry to one O(11), two equivalent O(1), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. The K(7)-O(11) bond length is 2.69 Å. Both K(7)-O(1) bond lengths are 3.02 Å. Both K(7)-O(5) bond lengths are 2.90 Å. Both K(7)-O(7) bond lengths are 3.33 Å. Both K(7)-O(8) bond lengths are 3.19 Å. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(1), one O(9), and two equivalent O(5) atoms. The Se(1)-O(1) bond length is 1.69 Å. The Se(1)-O(9) bond length is 1.67 Å. Both Se(1)-O(5) bond lengths are 1.68 Å. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(10), one O(2), and two equivalent O(6) atoms. The Se(2)-O(10) bond length is 1.68 Å. The Se(2)-O(2) bond length is 1.68 Å. Both Se(2)-O(6) bond lengths are 1.68 Å. In the third Se site, Se(3) is bonded in a tetrahedral geometry to one O(11), one O(3), and two equivalent O(7) atoms. The Se(3)-O(11) bond length is 1.67 Å. The Se(3)-O(3) bond length is 1.68 Å. Both Se(3)-O(7) bond lengths are 1.68 Å. In the fourth Se site, Se(4) is bonded in a tetrahedral geometry to one O(12), one O(4), and two equivalent O(8) atoms. The Se(4)-O(12) bond length is 1.67 Å. The Se(4)-O(4) bond length is 1.68 Å. Both Se(4)-O(8) bond lengths are 1.68 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one K(1), one K(2), two equivalent K(7), and one Se(1) atom. In the second O site, O(2) is bonded to one K(1), one K(2), two equivalent K(6), and one Se(2) atom to form distorted corner-sharing OK4Se square pyramids. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(3), one K(4), two equivalent K(5), and one Se(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(3), one K(4), one K(6), and one Se(4) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one K(3), one K(4), one K(5), one K(7), and one Se(1) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one K(3), one K(4), one K(5), one K(6), and one Se(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(5), one K(6), one K(7), and one Se(3) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(6), one K(7), and one Se(4) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one K(1), one K(5), two equivalent K(3), and one Se(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(4), and one Se(2) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one K(3), one K(7), two equivalent K(1), and one Se(3) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one K(4), one K(6), two equivalent K(2), and one Se(4) atom.