K2SiH4(NO)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 11-coordinate geometry to one N(1), one N(2), one H(1), one H(4), two equivalent H(3), two equivalent O(2), and three equivalent O(1) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one N(2), one H(1), one H(3), two equivalent H(2), two equivalent O(1), and two equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to one N(1), one N(2), one O(1), and one O(2) atom. There are two inequivalent N sites. In the first N site, N(2) is bonded in a 3-coordinate geometry to one K(1), one K(2), one Si(1), one H(3), and one H(4) atom. In the second N site, N(1) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Si(1), one H(1), and one H(2) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one K(1), one K(2), and one N(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to two equivalent K(2) and one N(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one K(2), two equivalent K(1), and one N(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one K(1) and one N(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(2), three equivalent K(1), and one Si(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent K(1), two equivalent K(2), and one Si(1) atom.
K2SiH4(NO)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 11-coordinate geometry to one N(1), one N(2), one H(1), one H(4), two equivalent H(3), two equivalent O(2), and three equivalent O(1) atoms. The K(1)-N(1) bond length is 2.94 Å. The K(1)-N(2) bond length is 2.86 Å. The K(1)-H(1) bond length is 2.78 Å. The K(1)-H(4) bond length is 2.78 Å. There is one shorter (2.70 Å) and one longer (2.93 Å) K(1)-H(3) bond length. There is one shorter (2.89 Å) and one longer (3.16 Å) K(1)-O(2) bond length. There are a spread of K(1)-O(1) bond distances ranging from 2.80-2.95 Å. In the second K site, K(2) is bonded in a 9-coordinate geometry to one N(2), one H(1), one H(3), two equivalent H(2), two equivalent O(1), and two equivalent O(2) atoms. The K(2)-N(2) bond length is 2.99 Å. The K(2)-H(1) bond length is 2.67 Å. The K(2)-H(3) bond length is 2.72 Å. There is one shorter (2.71 Å) and one longer (2.75 Å) K(2)-H(2) bond length. There is one shorter (2.71 Å) and one longer (2.88 Å) K(2)-O(1) bond length. There is one shorter (2.72 Å) and one longer (2.83 Å) K(2)-O(2) bond length. Si(1) is bonded in a tetrahedral geometry to one N(1), one N(2), one O(1), and one O(2) atom. The Si(1)-N(1) bond length is 1.77 Å. The Si(1)-N(2) bond length is 1.77 Å. The Si(1)-O(1) bond length is 1.62 Å. The Si(1)-O(2) bond length is 1.61 Å. There are two inequivalent N sites. In the first N site, N(2) is bonded in a 3-coordinate geometry to one K(1), one K(2), one Si(1), one H(3), and one H(4) atom. The N(2)-H(3) bond length is 1.02 Å. The N(2)-H(4) bond length is 1.02 Å. In the second N site, N(1) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Si(1), one H(1), and one H(2) atom. The N(1)-H(1) bond length is 1.02 Å. The N(1)-H(2) bond length is 1.02 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one K(1), one K(2), and one N(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to two equivalent K(2) and one N(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one K(2), two equivalent K(1), and one N(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one K(1) and one N(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(2), three equivalent K(1), and one Si(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent K(1), two equivalent K(2), and one Si(1) atom.