Cu3C12N2H10(O3Cl)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one N(1), one O(2), one O(3), and two equivalent Cl(1) atoms to form distorted corner-sharing CuNCl2O2 square pyramids. The Cu(1)-N(1) bond length is 1.99 Å. The Cu(1)-O(2) bond length is 2.06 Å. The Cu(1)-O(3) bond length is 1.93 Å. There is one shorter (2.30 Å) and one longer (2.66 Å) Cu(1)-Cl(1) bond length. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to two equivalent O(1), two equivalent O(3), and two equivalent Cl(1) atoms. Both Cu(2)-O(1) bond lengths are 1.96 Å. Both Cu(2)-O(3) bond lengths are 1.94 Å. Both Cu(2)-Cl(1) bond lengths are 2.99 Å. There are six inequivalent C sites. In the first C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(6) atom. The C(3)-C(2) bond length is 1.40 Å. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(6) bond length is 1.51 Å. In the second C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one H(4) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(4) bond length is 1.09 Å. In the third C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one N(1), and one H(5) atom. The C(5)-N(1) bond length is 1.35 Å. The C(5)-H(5) bond length is 1.09 Å. In the fourth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(6)-O(1) bond length is 1.27 Å. The C(6)-O(2) bond length is 1.27 Å. In the fifth C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one H(2) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-N(1) bond length is 1.35 Å. The C(1)-H(2) bond length is 1.09 Å. In the sixth C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(3) atom. The C(2)-H(3) bond length is 1.09 Å. N(1) is bonded in a trigonal planar geometry to one Cu(1), one C(1), and one C(5) atom. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one C(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(2) 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 single-bond geometry to one C(5) atom. There are three inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one H(1) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(6) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(6) atom. Cl(1) is bonded in a 3-coordinate geometry to one Cu(2) and two equivalent Cu(1) atoms. Linkers: 4 [O]C(=O)c1ccncc1. Metal clusters: 6 [Cu]. The MOF has largest included sphere 2.82 A, density 2.11 g/cm3, surface area 3100.66 m2/g, accessible volume 0.15 cm3/g