MnC4N3H4O2Cl crystallizes in the monoclinic C2/c space group. Mn(1) is bonded to one N(1), one N(3), one O(1), one O(2), one Cl(1), and one Cl(2) atom to form corner-sharing MnN2Cl2O2 octahedra. The corner-sharing octahedral tilt angles range from 0-83°. The Mn(1)-N(1) bond length is 2.32 Å. The Mn(1)-N(3) bond length is 2.26 Å. The Mn(1)-O(1) bond length is 2.11 Å. The Mn(1)-O(2) bond length is 2.13 Å. The Mn(1)-Cl(1) bond length is 2.51 Å. The Mn(1)-Cl(2) bond length is 2.58 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(1) atom. The C(1)-N(1) bond length is 1.33 Å. The C(1)-N(3) bond length is 1.36 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(2), one N(3), and one H(2) atom. The C(2)-N(2) bond length is 1.34 Å. The C(2)-N(3) bond length is 1.34 Å. The C(2)-H(2) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted trigonal non-coplanar geometry to one N(2), one H(3), and one H(4) atom. The C(3)-N(2) bond length is 1.45 Å. The C(3)-H(3) bond length is 1.10 Å. The C(3)-H(4) bond length is 1.10 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(4)-O(1) bond length is 1.27 Å. The C(4)-O(2) bond length is 1.26 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one C(1), and one N(2) atom. The N(1)-N(2) bond length is 1.37 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one C(2), one C(3), and one N(1) atom. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Mn(1), one C(1), and one C(2) atom. There are four 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(3) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one C(4) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one C(4) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a linear geometry to two equivalent Mn(1) atoms. In the second Cl site, Cl(2) is bonded in an L-shaped geometry to two equivalent Mn(1) atoms. Linkers: 2 [O]C(=O)Cn1cncn1 ,2 [O]C(=O)CN1[CH]N=C[N]1. Metal clusters: 4 [Mn]. The MOF has largest included sphere 2.47 A, density 1.94 g/cm3, surface area 3021.04 m2/g, accessible volume 0.11 cm3/g