Mn3C4H8(N10Cl)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one N(2), one N(5), one N(7), one N(9), and one Cl(1) atom to form corner-sharing MnN4Cl square pyramids. The corner-sharing octahedral tilt angles are 86°. The Mn(1)-N(2) bond length is 2.23 Å. The Mn(1)-N(5) bond length is 2.28 Å. The Mn(1)-N(7) bond length is 2.25 Å. The Mn(1)-N(9) bond length is 2.26 Å. The Mn(1)-Cl(1) bond length is 2.58 Å. In the second Mn site, Mn(2) is bonded to two equivalent N(4), two equivalent N(6), and two equivalent Cl(1) atoms to form corner-sharing MnN4Cl2 octahedra. Both Mn(2)-N(4) bond lengths are 2.24 Å. Both Mn(2)-N(6) bond lengths are 2.26 Å. Both Mn(2)-Cl(1) bond lengths are 2.56 Å. There are two 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 N(7) atom. The C(1)-N(1) bond length is 1.35 Å. The C(1)-N(2) bond length is 1.34 Å. The C(1)-N(7) bond length is 1.34 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(5), one N(8), and one N(9) atom. The C(2)-N(5) bond length is 1.34 Å. The C(2)-N(8) bond length is 1.36 Å. The C(2)-N(9) bond length is 1.35 Å. There are ten inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one C(1), one H(1), and one H(3) atom. The N(1)-H(1) bond length is 0.86 Å. The N(1)-H(3) bond length is 0.86 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Mn(1), one C(1), and one N(10) atom. The N(2)-N(10) bond length is 1.36 Å. In the third N site, N(3) is bonded in a water-like geometry to one N(4) and one N(9) atom. The N(3)-N(4) bond length is 1.30 Å. The N(3)-N(9) bond length is 1.35 Å. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one Mn(2), one N(3), and one N(5) atom. The N(4)-N(5) bond length is 1.36 Å. In the fifth N site, N(5) is bonded in a distorted trigonal planar geometry to one Mn(1), one C(2), and one N(4) atom. In the sixth N site, N(6) is bonded in a distorted trigonal planar geometry to one Mn(2), one N(10), and one N(7) atom. The N(6)-N(10) bond length is 1.30 Å. The N(6)-N(7) bond length is 1.36 Å. In the seventh N site, N(7) is bonded in a distorted trigonal planar geometry to one Mn(1), one C(1), and one N(6) atom. In the eighth N site, N(8) is bonded in a distorted trigonal planar geometry to one C(2), one H(2), and one H(4) atom. The N(8)-H(2) bond length is 0.86 Å. The N(8)-H(4) bond length is 0.86 Å. In the ninth N site, N(9) is bonded in a distorted trigonal planar geometry to one Mn(1), one C(2), and one N(3) atom. In the tenth N site, N(10) is bonded in a water-like geometry to one N(2) and one N(6) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(8) atom. In the third H site, H(3) is bonded in a single-bond geometry to one N(1) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(8) atom. Cl(1) is bonded in an L-shaped geometry to one Mn(1) and one Mn(2) atom. Linkers: 8 NC1=NN=N[N]1. Metal clusters: 2 Cl[Mn]12(Cl)(N=N[Mn]N=N1)N=N[Mn]N=N2. The MOF has largest included sphere 4.23 A, density 1.67 g/cm3, surface area 3208.56 m2/g, accessible volume 0.24 cm3/g