K3Ni(NO2)5 crystallizes in the monoclinic P2_1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the second K site, K(2) is bonded in a 8-coordinate geometry to one N(3), one O(1), one O(2), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. In the third K site, K(3) is bonded in a 8-coordinate geometry to one N(3), one O(1), one O(2), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. Ni(1) is bonded in an octahedral geometry to one N(1), one N(2), one N(4), one N(5), one O(4), and one O(7) atom. There are five inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Ni(1), one O(10), and one O(3) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Ni(1), one O(1), and one O(2) atom. In the third N site, N(3) is bonded in a distorted bent 120 degrees geometry to one K(2), one K(3), one O(4), and one O(7) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Ni(1), one O(5), and one O(8) atom. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one Ni(1), one O(6), and one O(9) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Ni(1), and one N(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(4) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(5) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one Ni(1), and one N(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(5) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(1) and one N(1) atom.
K3Ni(NO2)5 crystallizes in the monoclinic P2_1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The K(1)-O(1) bond length is 2.91 Å. The K(1)-O(10) bond length is 2.99 Å. The K(1)-O(2) bond length is 2.91 Å. The K(1)-O(3) bond length is 3.00 Å. The K(1)-O(4) bond length is 2.76 Å. The K(1)-O(5) bond length is 3.00 Å. The K(1)-O(6) bond length is 3.02 Å. The K(1)-O(7) bond length is 3.00 Å. The K(1)-O(8) bond length is 2.92 Å. The K(1)-O(9) bond length is 2.91 Å. In the second K site, K(2) is bonded in a 8-coordinate geometry to one N(3), one O(1), one O(2), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. The K(2)-N(3) bond length is 3.15 Å. The K(2)-O(1) bond length is 2.91 Å. The K(2)-O(2) bond length is 2.86 Å. The K(2)-O(3) bond length is 2.90 Å. The K(2)-O(5) bond length is 3.01 Å. The K(2)-O(6) bond length is 2.86 Å. The K(2)-O(8) bond length is 2.88 Å. The K(2)-O(9) bond length is 3.18 Å. In the third K site, K(3) is bonded in a 8-coordinate geometry to one N(3), one O(1), one O(2), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. The K(3)-N(3) bond length is 3.17 Å. The K(3)-O(1) bond length is 2.87 Å. The K(3)-O(2) bond length is 2.89 Å. The K(3)-O(3) bond length is 2.93 Å. The K(3)-O(5) bond length is 2.87 Å. The K(3)-O(6) bond length is 3.01 Å. The K(3)-O(8) bond length is 3.17 Å. The K(3)-O(9) bond length is 2.89 Å. Ni(1) is bonded in an octahedral geometry to one N(1), one N(2), one N(4), one N(5), one O(4), and one O(7) atom. The Ni(1)-N(1) bond length is 2.08 Å. The Ni(1)-N(2) bond length is 2.09 Å. The Ni(1)-N(4) bond length is 2.17 Å. The Ni(1)-N(5) bond length is 2.16 Å. The Ni(1)-O(4) bond length is 2.15 Å. The Ni(1)-O(7) bond length is 2.16 Å. There are five inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Ni(1), one O(10), and one O(3) atom. The N(1)-O(10) bond length is 1.25 Å. The N(1)-O(3) bond length is 1.27 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to one Ni(1), one O(1), and one O(2) atom. The N(2)-O(1) bond length is 1.26 Å. The N(2)-O(2) bond length is 1.26 Å. In the third N site, N(3) is bonded in a distorted bent 120 degrees geometry to one K(2), one K(3), one O(4), and one O(7) atom. The N(3)-O(4) bond length is 1.28 Å. The N(3)-O(7) bond length is 1.27 Å. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Ni(1), one O(5), and one O(8) atom. The N(4)-O(5) bond length is 1.26 Å. The N(4)-O(8) bond length is 1.26 Å. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one Ni(1), one O(6), and one O(9) atom. The N(5)-O(6) bond length is 1.26 Å. The N(5)-O(9) bond length is 1.26 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Ni(1), and one N(3) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(4) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(5) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one Ni(1), and one N(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one N(5) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(1) and one N(1) atom.