KInH3(C5O4)3 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(7), two equivalent O(6), and two equivalent O(8) atoms. The K(1)-O(1) bond length is 2.93 Å. The K(1)-O(2) bond length is 2.80 Å. The K(1)-O(7) bond length is 2.87 Å. There is one shorter (2.82 Å) and one longer (2.83 Å) K(1)-O(6) bond length. There is one shorter (2.89 Å) and one longer (3.22 Å) K(1)-O(8) bond length. In(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. The In(1)-O(1) bond length is 2.22 Å. The In(1)-O(3) bond length is 2.41 Å. The In(1)-O(4) bond length is 2.32 Å. The In(1)-O(5) bond length is 2.21 Å. The In(1)-O(6) bond length is 2.64 Å. The In(1)-O(8) bond length is 2.23 Å. The In(1)-O(9) bond length is 2.13 Å. There are fifteen inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(12), one C(5), and one H(1) atom. The C(1)-C(12) bond length is 1.38 Å. The C(1)-C(5) bond length is 1.38 Å. The C(1)-H(1) bond length is 0.93 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(11), one C(3), and one C(5) atom. The C(2)-C(11) bond length is 1.37 Å. The C(2)-C(3) bond length is 1.48 Å. The C(2)-C(5) bond length is 1.40 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(6) atom. The C(3)-O(1) bond length is 1.27 Å. The C(3)-O(6) bond length is 1.22 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(6), one C(7), and one C(9) atom. The C(4)-C(6) bond length is 1.38 Å. The C(4)-C(7) bond length is 1.40 Å. The C(4)-C(9) bond length is 1.50 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(1), one C(10), and one C(2) atom. The C(5)-C(10) bond length is 1.49 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(4), one C(7), and one H(2) atom. The C(6)-C(7) bond length is 1.39 Å. The C(6)-H(2) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(8) atom. The C(7)-C(8) bond length is 1.50 Å. In the eighth C site, C(8) is bonded in a bent 120 degrees geometry to one C(7), one O(7), and one O(9) atom. The C(8)-O(7) bond length is 1.22 Å. The C(8)-O(9) bond length is 1.26 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(3), and one O(5) atom. The C(9)-O(3) bond length is 1.25 Å. The C(9)-O(5) bond length is 1.25 Å. In the tenth C site, C(10) is bonded in a bent 120 degrees geometry to one C(5), one O(4), and one O(8) atom. The C(10)-O(4) bond length is 1.25 Å. The C(10)-O(8) bond length is 1.27 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(13), one C(2), and one H(3) atom. The C(11)-C(13) bond length is 1.39 Å. The C(11)-H(3) bond length is 0.93 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one C(1), one C(13), and one C(14) atom. The C(12)-C(13) bond length is 1.42 Å. The C(12)-C(14) bond length is 1.52 Å. In the thirteenth C site, C(13) is bonded in a trigonal planar geometry to one C(11), one C(12), and one C(15) atom. The C(13)-C(15) bond length is 1.51 Å. In the fourteenth C site, C(14) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(10), and one O(2) atom. The C(14)-O(10) bond length is 1.23 Å. The C(14)-O(2) bond length is 1.26 Å. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(13), one O(11), and one O(12) atom. The C(15)-O(11) bond length is 1.28 Å. The C(15)-O(12) bond length is 1.21 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(11) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one In(1), and one C(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1) and one C(14) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one In(1) and one C(9) atom. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one In(1) and one C(10) atom. In the fifth O site, O(5) is bonded in a distorted L-shaped geometry to one In(1) and one C(9) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent K(1), one In(1), and one C(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one K(1) and one C(8) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(1), one In(1), and one C(10) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one In(1) and one C(8) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one C(14) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one C(15) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one C(15) atom. Linkers: 6 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 4 [K] ,4 [In]. The MOF has largest included sphere 6.28 A, density 1.48 g/cm3, surface area 2647.37 m2/g, accessible volume 0.29 cm3/g