Cu2C6N2H4O7 crystallizes in the triclinic P1 space group. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one N(2), one O(1), one O(13), and one O(9) atom. The Cu(1)-N(2) bond length is 1.98 Å. The Cu(1)-O(1) bond length is 1.99 Å. The Cu(1)-O(13) bond length is 1.87 Å. The Cu(1)-O(9) bond length is 1.90 Å. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to one N(1), one O(10), one O(14), and one O(2) atom. The Cu(2)-N(1) bond length is 1.97 Å. The Cu(2)-O(10) bond length is 1.90 Å. The Cu(2)-O(14) bond length is 1.86 Å. The Cu(2)-O(2) bond length is 1.99 Å. In the third Cu site, Cu(3) is bonded in a distorted trigonal bipyramidal geometry to one N(4), one O(1), one O(11), one O(13), and one O(4) atom. The Cu(3)-N(4) bond length is 2.01 Å. The Cu(3)-O(1) bond length is 2.16 Å. The Cu(3)-O(11) bond length is 2.00 Å. The Cu(3)-O(13) bond length is 1.89 Å. The Cu(3)-O(4) bond length is 2.23 Å. In the fourth Cu site, Cu(4) is bonded in a 5-coordinate geometry to one N(3), one O(12), one O(14), one O(2), and one O(3) atom. The Cu(4)-N(3) bond length is 2.00 Å. The Cu(4)-O(12) bond length is 2.01 Å. The Cu(4)-O(14) bond length is 1.88 Å. The Cu(4)-O(2) bond length is 2.20 Å. The Cu(4)-O(3) bond length is 2.24 Å. There are twelve inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(3) atom. The C(1)-O(1) bond length is 1.31 Å. The C(1)-O(3) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(4) atom. The C(2)-O(2) bond length is 1.31 Å. The C(2)-O(4) bond length is 1.25 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one N(3) atom. The C(3)-N(3) bond length is 1.34 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one N(4) atom. The C(4)-N(4) bond length is 1.34 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(11), one C(7), and one N(3) atom. The C(5)-C(11) bond length is 1.51 Å. The C(5)-C(7) bond length is 1.40 Å. The C(5)-N(3) bond length is 1.35 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(12), one C(8), and one N(4) atom. The C(6)-C(12) bond length is 1.51 Å. The C(6)-C(8) bond length is 1.40 Å. The C(6)-N(4) bond length is 1.35 Å. In the seventh C site, C(7) is bonded in a distorted trigonal planar geometry to one C(5), one N(1), and one H(7) atom. The C(7)-N(1) bond length is 1.33 Å. The C(7)-H(7) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(6), one N(2), and one H(8) atom. The C(8)-N(2) bond length is 1.33 Å. The C(8)-H(8) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one N(1) and one O(9) atom. The C(9)-N(1) bond length is 1.37 Å. The C(9)-O(9) bond length is 1.28 Å. In the tenth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one N(2) and one O(10) atom. The C(10)-N(2) bond length is 1.37 Å. The C(10)-O(10) bond length is 1.28 Å. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(5), and one O(7) atom. The C(11)-O(5) bond length is 1.27 Å. The C(11)-O(7) bond length is 1.27 Å. In the twelfth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(6), and one O(8) atom. The C(12)-O(6) bond length is 1.27 Å. The C(12)-O(8) bond length is 1.27 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Cu(2), one C(7), and one C(9) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Cu(1), one C(10), and one C(8) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one Cu(4), one C(3), and one C(5) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Cu(3), one C(4), and one C(6) atom. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a 2-coordinate geometry to one O(11) and one O(6) atom. The H(1)-O(11) bond length is 1.01 Å. The H(1)-O(6) bond length is 1.64 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(12) and one O(5) atom. The H(2)-O(12) bond length is 1.01 Å. The H(2)-O(5) bond length is 1.65 Å. In the third H site, H(3) is bonded in a distorted linear geometry to one O(11) and one O(8) atom. The H(3)-O(11) bond length is 1.01 Å. The H(3)-O(8) bond length is 1.61 Å. In the fourth H site, H(4) is bonded in a distorted linear geometry to one O(12) and one O(7) atom. The H(4)-O(12) bond length is 1.01 Å. The H(4)-O(7) bond length is 1.61 Å. In the fifth H site, H(5) is bonded in a distorted single-bond geometry to one O(13) and one O(5) atom. The H(5)-O(13) bond length is 1.00 Å. The H(5)-O(5) bond length is 1.71 Å. In the sixth H site, H(6) is bonded in a distorted single-bond geometry to one O(14) and one O(6) atom. The H(6)-O(14) bond length is 1.00 Å. The H(6)-O(6) bond length is 1.70 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(7) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(8) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(3), and one C(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Cu(2), one Cu(4), and one C(2) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Cu(4) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Cu(3) and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one C(11), one H(2), and one H(5) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one C(12), one H(1), and one H(6) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one C(11) and one H(4) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one C(12) and one H(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(9) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(10) atom. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Cu(3), one H(1), and one H(3) atom. In the twelfth O site, O(12) is bonded in a distorted water-like geometry to one Cu(4), one H(2), and one H(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Cu(1), one Cu(3), and one H(5) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Cu(2), one Cu(4), and one H(6) atom. Linkers: 2 [O]C(=O)[C]1C=NC(=O)C(C([O])=O)=N1. Metal clusters: 4 [Cu]. The MOF has largest included sphere 2.56 A, density 2.37 g/cm3, surface area 2877.30 m2/g, accessible volume 0.11 cm3/g