KVC7H2(NO4)2 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 7-coordinate geometry to one O(1), one O(4), one O(5), one O(7), one O(8), and two equivalent O(2) atoms. The K(1)-O(1) bond length is 2.73 Å. The K(1)-O(4) bond length is 3.02 Å. The K(1)-O(5) bond length is 2.79 Å. The K(1)-O(7) bond length is 2.77 Å. The K(1)-O(8) bond length is 2.96 Å. There is one shorter (2.72 Å) and one longer (2.75 Å) K(1)-O(2) bond length. V(1) is bonded in a 5-coordinate geometry to one N(1), one O(1), one O(2), one O(3), and one O(4) atom. The V(1)-N(1) bond length is 2.13 Å. The V(1)-O(1) bond length is 1.64 Å. The V(1)-O(2) bond length is 1.64 Å. The V(1)-O(3) bond length is 1.99 Å. The V(1)-O(4) bond length is 1.98 Å. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(3), and one O(5) atom. The C(1)-C(2) bond length is 1.51 Å. The C(1)-O(3) bond length is 1.31 Å. The C(1)-O(5) bond length is 1.23 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one N(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-N(1) bond length is 1.34 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(1) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one N(2) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-N(2) bond length is 1.47 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(4), one C(6), and one H(2) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-H(2) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(5), one C(7), and one N(1) atom. The C(6)-C(7) bond length is 1.51 Å. The C(6)-N(1) bond length is 1.33 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(4), and one O(6) atom. The C(7)-O(4) bond length is 1.32 Å. The C(7)-O(6) bond length is 1.23 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one V(1), one C(2), and one C(6) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(4), one O(7), and one O(8) atom. The N(2)-O(7) bond length is 1.24 Å. The N(2)-O(8) bond length is 1.24 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(5) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1) and one V(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one V(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one V(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one K(1), one V(1), and one C(7) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(7) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one K(1) and one N(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1) and one N(2) atom. Linkers: 4 [O]C(=O)c1cc([N+](=O)[O-])cc(C([O])=O)n1. Metal clusters: 4 [K] ,4 [V]. The MOF has largest included sphere 1.96 A, density 2.12 g/cm3, surface area 1880.39 m2/g, accessible volume 0.03 cm3/g