CdC5N5H5SO4 crystallizes in the monoclinic P2_1/c space group. Cd(1) is bonded in a 6-coordinate geometry to one N(1), one N(2), one O(1), one O(2), one O(3), and one O(4) atom. The Cd(1)-N(1) bond length is 2.21 Å. The Cd(1)-N(2) bond length is 2.24 Å. The Cd(1)-O(1) bond length is 2.54 Å. The Cd(1)-O(2) bond length is 2.35 Å. The Cd(1)-O(3) bond length is 2.52 Å. The Cd(1)-O(4) bond length is 2.52 Å. There are five inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(4) atom. The C(1)-N(1) bond length is 1.35 Å. The C(1)-N(2) bond length is 1.35 Å. The C(1)-H(4) bond length is 1.09 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(5), one N(1), and one N(3) atom. The C(2)-C(5) bond length is 1.41 Å. The C(2)-N(1) bond length is 1.37 Å. The C(2)-N(3) bond length is 1.36 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one N(3), one N(4), and one H(5) atom. The C(3)-N(3) bond length is 1.31 Å. The C(3)-N(4) bond length is 1.37 Å. The C(3)-H(5) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(5), one N(4), and one N(5) atom. The C(4)-C(5) bond length is 1.42 Å. The C(4)-N(4) bond length is 1.38 Å. The C(4)-N(5) bond length is 1.32 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one N(2) atom. The C(5)-N(2) bond length is 1.38 Å. There are five inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Cd(1), one C(1), and one C(2) 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(5) atom. In the third N site, N(3) is bonded in a bent 120 degrees geometry to one C(2) and one C(3) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one C(3), one C(4), and one H(1) atom. The N(4)-H(1) bond length is 1.05 Å. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one C(4), one H(2), and one H(3) atom. The N(5)-H(2) bond length is 1.03 Å. The N(5)-H(3) bond length is 1.03 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one N(4) and one O(4) atom. The H(1)-O(4) bond length is 1.71 Å. In the second H site, H(2) is bonded in a single-bond geometry to one N(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one N(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(1) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(3) atom. S(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The S(1)-O(1) bond length is 1.48 Å. The S(1)-O(2) bond length is 1.51 Å. The S(1)-O(3) bond length is 1.50 Å. The S(1)-O(4) bond length is 1.50 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cd(1) and one S(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Cd(1) and one S(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cd(1) and one S(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cd(1), one H(1), and one S(1) atom. Linkers: 2 NC1=C2[N]C=NC2=N[CH]N1 ,2 NC1=C2N=C[N]C2=N[CH]N1. Metal clusters: 4 [Cd]. The MOF has largest included sphere 1.80 A, density 2.61 g/cm3, surface area 2631.19 m2/g, accessible volume 0.06 cm3/g