KC10H7(NO2)4 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(13), one O(15), one O(4), one O(5), and one O(9) atom. The K(1)-O(1) bond length is 2.77 Å. The K(1)-O(12) bond length is 2.94 Å. The K(1)-O(13) bond length is 2.76 Å. The K(1)-O(15) bond length is 2.71 Å. The K(1)-O(4) bond length is 2.85 Å. The K(1)-O(5) bond length is 2.76 Å. The K(1)-O(9) bond length is 2.69 Å. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(14), one O(16), one O(2), one O(3), and one O(6) atom. The K(2)-O(10) bond length is 2.69 Å. The K(2)-O(11) bond length is 2.94 Å. The K(2)-O(14) bond length is 2.76 Å. The K(2)-O(16) bond length is 2.71 Å. The K(2)-O(2) bond length is 2.77 Å. The K(2)-O(3) bond length is 2.85 Å. The K(2)-O(6) bond length is 2.76 Å. There are twenty inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(3) atom. The C(1)-C(3) bond length is 1.48 Å. The C(1)-O(1) bond length is 1.32 Å. The C(1)-O(3) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(2), and one O(4) atom. The C(2)-C(4) bond length is 1.48 Å. The C(2)-O(2) bond length is 1.32 Å. The C(2)-O(4) bond length is 1.25 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(5), and one C(9) atom. The C(3)-C(5) bond length is 1.38 Å. The C(3)-C(9) bond length is 1.46 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(10), one C(2), and one C(6) atom. The C(4)-C(10) bond length is 1.46 Å. The C(4)-C(6) bond length is 1.38 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(3); one N(1,2); and one H(11,12) atom. The C(5)-N(1,2) bond length is 1.35 Å. The C(5)-H(11,12) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(4); one N(1,2); and one H(11,12) atom. The C(6)-N(1,2) bond length is 1.35 Å. The C(6)-H(11,12) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one N(1,2); one N(3); and one O(5) atom. The C(7)-N(1,2) bond length is 1.38 Å. The C(7)-N(3) bond length is 1.36 Å. The C(7)-O(5) bond length is 1.25 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one N(1,2); one N(4); and one O(6) atom. The C(8)-N(1,2) bond length is 1.38 Å. The C(8)-N(4) bond length is 1.36 Å. The C(8)-O(6) bond length is 1.25 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(3), one N(3), and one O(7) atom. The C(9)-N(3) bond length is 1.40 Å. The C(9)-O(7) bond length is 1.24 Å. In the tenth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(4), one N(4), and one O(8) atom. The C(10)-N(4) bond length is 1.40 Å. The C(10)-O(8) bond length is 1.24 Å. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(13), one O(11), and one O(9) atom. The C(11)-C(13) bond length is 1.49 Å. The C(11)-O(11) bond length is 1.26 Å. The C(11)-O(9) bond length is 1.29 Å. In the twelfth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(14), one O(10), and one O(12) atom. The C(12)-C(14) bond length is 1.49 Å. The C(12)-O(10) bond length is 1.29 Å. The C(12)-O(12) bond length is 1.26 Å. In the thirteenth C site, C(13) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(19) atom. The C(13)-C(15) bond length is 1.37 Å. The C(13)-C(19) bond length is 1.46 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(12), one C(16), and one C(20) atom. The C(14)-C(16) bond length is 1.37 Å. The C(14)-C(20) bond length is 1.46 Å. In the fifteenth C site, C(15) is bonded in a distorted trigonal planar geometry to one C(13); one N(5,6); and one H(13,14) atom. The C(15)-N(5,6) bond length is 1.35 Å. The C(15)-H(13,14) bond length is 1.09 Å. In the sixteenth C site, C(16) is bonded in a distorted trigonal planar geometry to one C(14); one N(5,6); and one H(13,14) atom. The C(16)-N(5,6) bond length is 1.35 Å. The C(16)-H(13,14) bond length is 1.09 Å. In the seventeenth C site, C(17) is bonded in a trigonal planar geometry to one N(5,6); one N(7); and one O(13) atom. The C(17)-N(5,6) bond length is 1.38 Å. The C(17)-N(7) bond length is 1.36 Å. The C(17)-O(13) bond length is 1.24 Å. In the eighteenth C site, C(18) is bonded in a trigonal planar geometry to one N(5,6); one N(8); and one O(14) atom. The C(18)-N(5,6) bond length is 1.38 Å. The C(18)-N(8) bond length is 1.36 Å. The C(18)-O(14) bond length is 1.24 Å. In the nineteenth C site, C(19) is bonded in a distorted bent 120 degrees geometry to one C(13), one N(7), and one O(15) atom. The C(19)-N(7) bond length is 1.40 Å. The C(19)-O(15) bond length is 1.24 Å. In the twentieth C site, C(20) is bonded in a distorted bent 120 degrees geometry to one C(14), one N(8), and one O(16) atom. The C(20)-N(8) bond length is 1.40 Å. The C(20)-O(16) bond length is 1.24 Å. There are six inequivalent N sites. In the first N site, N(1,2) is bonded in a trigonal planar geometry to one C(5), one C(7), and one H(3) atom. The N(1,2)-H(3) bond length is 1.04 Å. In the second N site, N(3) is bonded in a trigonal planar geometry to one C(7), one C(9), and one H(5) atom. The N(3)-H(5) bond length is 1.05 Å. In the third N site, N(4) is bonded in a trigonal planar geometry to one C(10), one C(8), and one H(6) atom. The N(4)-H(6) bond length is 1.05 Å. In the fourth N site, N(5,6) is bonded in a trigonal planar geometry to one C(15), one C(17), and one H(7) atom. The N(5,6)-H(7) bond length is 1.04 Å. In the fifth N site, N(7) is bonded in a trigonal planar geometry to one C(17), one C(19), and one H(9) atom. The N(7)-H(9) bond length is 1.04 Å. In the sixth N site, N(8) is bonded in a trigonal planar geometry to one C(18), one C(20), and one H(10) atom. The N(8)-H(10) bond length is 1.04 Å. There are twelve inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(1) and one O(10) atom. The H(1)-O(1) bond length is 1.17 Å. The H(1)-O(10) bond length is 1.27 Å. In the second H site, H(2) is bonded in a linear geometry to one O(2) and one O(9) atom. The H(2)-O(2) bond length is 1.17 Å. The H(2)-O(9) bond length is 1.27 Å. In the third H site, H(3) is bonded in a single-bond geometry to one N(1,2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(1,2) atom. The H(4)-N(1,2) bond length is 1.04 Å. In the fifth H site, H(5) is bonded in a distorted single-bond geometry to one N(3) and one O(14) atom. The H(5)-O(14) bond length is 1.68 Å. In the sixth H site, H(6) is bonded in a distorted single-bond geometry to one N(4) and one O(13) atom. The H(6)-O(13) bond length is 1.68 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one N(5,6) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one N(5,6) atom. The H(8)-N(5,6) bond length is 1.04 Å. In the ninth H site, H(9) is bonded in a single-bond geometry to one N(7) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one N(8) atom. In the eleventh H site, H(11,12) is bonded in a single-bond geometry to one C(5) atom. In the twelfth H site, H(13,14) is bonded in a single-bond geometry to one C(15) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1), one C(1), and one H(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(2), one C(2), and one H(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to one K(2) and one C(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one K(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1) and one C(7) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(2) and one C(8) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one C(9) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one C(10) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one K(1), one C(11), and one H(2) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one K(2), one C(12), and one H(1) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one K(2) and one C(11) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(1) and one C(12) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one K(1), one C(17), and one H(6) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one K(2), one C(18), and one H(5) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one K(1) and one C(19) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one K(2) and one C(20) atom. Linkers: 2 [O]C(=O)c1c[nH]c(=O)[nH]c1=O ,2 O=C(O)c1c[nH]c(=O)[nH]c1=O. Metal clusters: 2 [K]. The MOF has largest included sphere 1.92 A, density 1.84 g/cm3, surface area 2678.07 m2/g, accessible volume 0.07 cm3/g