ZnC2N3H3SO4 crystallizes in the triclinic P-1 space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent N(1), two equivalent O(1), and two equivalent O(2) atoms to form ZnN2O4 octahedra that share corners with four equivalent S(1)O4 tetrahedra. Both Zn(1)-N(1) bond lengths are 2.11 Å. Both Zn(1)-O(1) bond lengths are 2.14 Å. Both Zn(1)-O(2) bond lengths are 2.18 Å. In the second Zn site, Zn(2) is bonded to one N(3), one N(5), one O(4), and one O(5) atom to form ZnN2O2 tetrahedra that share  a cornercorner with one S(1)O4 tetrahedra and  a cornercorner with one S(2)O4 tetrahedra. The Zn(2)-N(3) bond length is 2.00 Å. The Zn(2)-N(5) bond length is 1.99 Å. The Zn(2)-O(4) bond length is 2.00 Å. The Zn(2)-O(5) bond length is 1.96 Å. In the third Zn site, Zn(3) is bonded to two equivalent N(4), two equivalent O(7), and two equivalent O(8) atoms to form ZnN2O4 octahedra that share corners with four equivalent S(2)O4 tetrahedra. Both Zn(3)-N(4) bond lengths are 2.13 Å. Both Zn(3)-O(7) bond lengths are 2.17 Å. Both Zn(3)-O(8) bond lengths are 2.14 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(2), one N(3), and one H(1) atom. The C(1)-N(2) bond length is 1.33 Å. The C(1)-N(3) bond length is 1.34 Å. The C(1)-H(1) bond length is 1.08 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(2) atom. The C(2)-N(1) bond length is 1.33 Å. The C(2)-N(3) bond length is 1.36 Å. The C(2)-H(2) bond length is 1.08 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one N(4), one N(6), and one H(3) atom. The C(3)-N(4) bond length is 1.32 Å. The C(3)-N(6) bond length is 1.36 Å. The C(3)-H(3) bond length is 1.08 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one N(5), one N(6), and one H(4) atom. The C(4)-N(5) bond length is 1.33 Å. The C(4)-N(6) bond length is 1.35 Å. The C(4)-H(4) bond length is 1.08 Å. There are six inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(2), and one N(2) atom. The N(1)-N(2) bond length is 1.36 Å. In the second N site, N(2) is bonded in a 2-coordinate geometry to one C(1), one N(1), and one H(5) atom. The N(2)-H(5) bond length is 1.07 Å. In the third N site, N(3) is bonded in a trigonal planar geometry to one Zn(2), one C(1), and one C(2) atom. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one Zn(3), one C(3), and one N(5) atom. The N(4)-N(5) bond length is 1.38 Å. In the fifth N site, N(5) is bonded in a distorted trigonal planar geometry to one Zn(2), one C(4), and one N(4) atom. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one C(3), one C(4), and one H(6) atom. The N(6)-H(6) bond length is 1.07 Å. There are six 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(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(4) atom. In the fifth H site, H(5) is bonded in a linear geometry to one N(2) and one O(3) atom. The H(5)-O(3) bond length is 1.57 Å. In the sixth H site, H(6) is bonded in a linear geometry to one N(6) and one O(6) atom. The H(6)-O(6) bond length is 1.57 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share corners with two equivalent Zn(1)N2O4 octahedra and  a cornercorner with one Zn(2)N2O2 tetrahedra. The corner-sharing octahedral tilt angles range from 46-51°. The S(1)-O(1) bond length is 1.48 Å. The S(1)-O(2) bond length is 1.50 Å. The S(1)-O(3) bond length is 1.48 Å. The S(1)-O(4) bond length is 1.51 Å. In the second S site, S(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form SO4 tetrahedra that share corners with two equivalent Zn(3)N2O4 octahedra and  a cornercorner with one Zn(2)N2O2 tetrahedra. The corner-sharing octahedral tilt angles range from 39-45°. The S(2)-O(5) bond length is 1.52 Å. The S(2)-O(6) bond length is 1.48 Å. The S(2)-O(7) bond length is 1.48 Å. The S(2)-O(8) bond length is 1.50 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one S(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one S(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one H(5) and one S(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(2) and one S(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Zn(2) and one S(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one H(6) and one S(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Zn(3) and one S(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Zn(3) and one S(2) atom. Linkers: 1 c1nc[nH]n1 ,1 [CH]1N=C[N]N1 ,2 c1nnc[nH]1. Metal clusters: 4 [Zn]. The MOF has largest included sphere 1.84 A, density 2.53 g/cm3, surface area 2781.93 m2/g, accessible volume 0.09 cm3/g