CdC5N2H5O3Cl crystallizes in the monoclinic P2_1/c space group. Cd(1) is bonded to one N(1), one N(2), one O(1), one O(3), two equivalent O(2), and one Cl(1) atom to form distorted edge-sharing CdN2ClO4 pentagonal bipyramids. The Cd(1)-N(1) bond length is 2.45 Å. The Cd(1)-N(2) bond length is 2.44 Å. The Cd(1)-O(1) bond length is 2.39 Å. The Cd(1)-O(3) bond length is 2.34 Å. There is one shorter (2.38 Å) and one longer (2.46 Å) Cd(1)-O(2) bond length. The Cd(1)-Cl(1) bond length is 2.65 Å. There are five inequivalent C sites. In the first C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one H(2) atom. The C(3)-C(2) bond length is 1.39 Å. The C(3)-C(4) bond length is 1.39 Å. The C(3)-H(2) bond length is 1.09 Å. In the second C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one N(1), and one H(3) atom. The C(4)-N(1) bond length is 1.34 Å. The C(4)-H(3) bond length is 1.09 Å. In the third C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(5)-O(1) bond length is 1.26 Å. The C(5)-O(2) bond length is 1.27 Å. In the fourth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one N(1) and one N(2) atom. The C(1)-N(1) bond length is 1.34 Å. The C(1)-N(2) bond length is 1.34 Å. In the fifth C site, C(2) is bonded in a distorted trigonal planar geometry to one C(3), one N(2), and one H(1) atom. The C(2)-N(2) bond length is 1.34 Å. The C(2)-H(1) bond length is 1.09 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(1), and one C(4) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(1), and one C(2) atom. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(3) atom. The H(4)-O(3) bond length is 0.99 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(3) and one Cl(1) atom. The H(5)-O(3) bond length is 0.99 Å. The H(5)-Cl(1) bond length is 2.08 Å. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted water-like geometry to one Cd(1), one H(4), and one H(5) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Cd(1) and one C(5) atom. In the third O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one C(5) atom. Cl(1) is bonded in a 2-coordinate geometry to one Cd(1) and one H(5) atom. Linkers: 4 [c]1cnc(-c2ncccn2)nc1 ,2 c1cnc(-c2ncccn2)nc1 ,1 [O]C(=O)C([O])=O. Metal clusters: 4 [Cd]. The MOF has largest included sphere 1.74 A, density 2.46 g/cm3, surface area 3051.07 m2/g, accessible volume 0.07 cm3/g