NH4H9Se2(NO4)2 is Indium-like structured and crystallizes in the monoclinic C2/c space group. The structure is zero-dimensional and consists of four ammonium molecules and four H9Se2(NO4)2 clusters. In each H9Se2(NO4)2 cluster, N(2) is bonded in a tetrahedral geometry to one H(3), one H(4), one H(5), and one H(6) atom. There are five inequivalent H sites. In the first H site, H(3) is bonded in a single-bond geometry to one N(2) and one O(4) atom. In the second H site, H(4) is bonded in a single-bond geometry to one N(2) atom. In the third H site, H(5) is bonded in a single-bond geometry to one N(2) atom. In the fourth H site, H(6) is bonded in a single-bond geometry to one N(2) atom. In the fifth H site, H(7) is bonded in a linear geometry to two equivalent O(1) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one H(7) and one Se(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Se(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one H(3) and one Se(1) atom.
NH4H9Se2(NO4)2 is Indium-like structured and crystallizes in the monoclinic C2/c space group. The structure is zero-dimensional and consists of four ammonium molecules and four H9Se2(NO4)2 clusters. In each H9Se2(NO4)2 cluster, N(2) is bonded in a tetrahedral geometry to one H(3), one H(4), one H(5), and one H(6) atom. The N(2)-H(3) bond length is 1.05 Å. The N(2)-H(4) bond length is 1.05 Å. The N(2)-H(5) bond length is 1.03 Å. The N(2)-H(6) bond length is 1.04 Å. There are five inequivalent H sites. In the first H site, H(3) is bonded in a single-bond geometry to one N(2) and one O(4) atom. The H(3)-O(4) bond length is 1.75 Å. In the second H site, H(4) is bonded in a single-bond geometry to one N(2) atom. In the third H site, H(5) is bonded in a single-bond geometry to one N(2) atom. In the fourth H site, H(6) is bonded in a single-bond geometry to one N(2) atom. In the fifth H site, H(7) is bonded in a linear geometry to two equivalent O(1) atoms. Both H(7)-O(1) bond lengths are 1.22 Å. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Se(1)-O(1) bond length is 1.72 Å. The Se(1)-O(2) bond length is 1.66 Å. The Se(1)-O(3) bond length is 1.68 Å. The Se(1)-O(4) bond length is 1.66 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one H(7) and one Se(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Se(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one H(3) and one Se(1) atom.