Cu3H4(C5O4)4 crystallizes in the triclinic P1 space group. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted square pyramidal geometry to one O(1), one O(10), one O(12), one O(14), and one O(6) atom. The Cu(1)-O(1) bond length is 1.97 Å. The Cu(1)-O(10) bond length is 2.13 Å. The Cu(1)-O(12) bond length is 1.98 Å. The Cu(1)-O(14) bond length is 1.99 Å. The Cu(1)-O(6) bond length is 1.97 Å. In the second Cu site, Cu(2) is bonded in a distorted trigonal bipyramidal geometry to one O(11), one O(13), one O(15), one O(2), and one O(5) atom. The Cu(2)-O(11) bond length is 1.96 Å. The Cu(2)-O(13) bond length is 2.01 Å. The Cu(2)-O(15) bond length is 2.10 Å. The Cu(2)-O(2) bond length is 1.96 Å. The Cu(2)-O(5) bond length is 1.97 Å. In the third Cu site, Cu(3) is bonded in a linear geometry to one O(4) and one O(7) atom. The Cu(3)-O(4) bond length is 1.87 Å. The Cu(3)-O(7) bond length is 1.88 Å. There are twenty inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(8) atom. The C(1)-C(2) bond length is 1.45 Å. The C(1)-C(6) bond length is 1.38 Å. The C(1)-C(8) bond length is 1.50 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-H(1) bond length is 0.95 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one C(9) atom. The C(3)-C(4) bond length is 1.46 Å. The C(3)-C(9) bond length is 1.40 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(10), one C(3), and one C(5) atom. The C(4)-C(10) bond length is 1.49 Å. The C(4)-C(5) bond length is 1.36 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(4), one C(6), and one H(2) atom. The C(5)-C(6) bond length is 1.38 Å. The C(5)-H(2) bond length is 0.95 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(1), one C(5), and one C(7) atom. The C(6)-C(7) bond length is 1.57 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.25 Å. The C(7)-O(2) bond length is 1.29 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.23 Å. The C(8)-O(4) bond length is 1.28 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(5), and one O(6) atom. The C(9)-O(5) bond length is 1.29 Å. The C(9)-O(6) bond length is 1.24 Å. In the tenth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(7), and one O(8) atom. The C(10)-O(7) bond length is 1.27 Å. The C(10)-O(8) bond length is 1.26 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(12), one C(16), and one C(20) atom. The C(11)-C(12) bond length is 1.38 Å. The C(11)-C(16) bond length is 1.48 Å. The C(11)-C(20) bond length is 1.48 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(11), one C(13), and one H(3) atom. The C(12)-C(13) bond length is 1.40 Å. The C(12)-H(3) bond length is 0.95 Å. In the thirteenth C site, C(13) is bonded in a trigonal planar geometry to one C(12), one C(14), and one C(18) atom. The C(13)-C(14) bond length is 1.33 Å. The C(13)-C(18) bond length is 1.57 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(13), one C(15), and one C(17) atom. The C(14)-C(15) bond length is 1.43 Å. The C(14)-C(17) bond length is 1.55 Å. In the fifteenth C site, C(15) is bonded in a distorted single-bond geometry to one C(14), one C(16), and one H(4) atom. The C(15)-C(16) bond length is 1.35 Å. The C(15)-H(4) bond length is 0.95 Å. In the sixteenth C site, C(16) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(19) atom. The C(16)-C(19) bond length is 1.44 Å. In the seventeenth C site, C(17) is bonded in a distorted bent 120 degrees geometry to one C(14), one O(10), and one O(9) atom. The C(17)-O(10) bond length is 1.24 Å. The C(17)-O(9) bond length is 1.25 Å. In the eighteenth C site, C(18) is bonded in a distorted bent 120 degrees geometry to one C(13), one O(11), and one O(12) atom. The C(18)-O(11) bond length is 1.22 Å. The C(18)-O(12) bond length is 1.31 Å. In the nineteenth C site, C(19) is bonded in a distorted bent 120 degrees geometry to one C(16), one O(13), and one O(14) atom. The C(19)-O(13) bond length is 1.23 Å. The C(19)-O(14) bond length is 1.29 Å. In the twentieth C site, C(20) is bonded in a distorted trigonal planar geometry to one C(11), one O(15), and one O(16) atom. The C(20)-O(15) bond length is 1.26 Å. The C(20)-O(16) bond length is 1.23 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(5) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(12) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(15) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(7) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(7) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(8) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Cu(3) and one C(8) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(9) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one C(9) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Cu(3) and one C(10) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one C(10) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one C(17) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Cu(1) and one C(17) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(18) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(18) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(19) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(19) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Cu(2) and one C(20) atom. In the sixteenth O site, O(16) is bonded in a single-bond geometry to one C(20) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 1 O=[C]O[Cu]1234O[C]O[Cu]1(O[C]=O)(O[C]O2)(O[C]O3)O[C]O4 ,1 O=[C]O[Cu]O[C]=O. The MOF has largest included sphere 4.84 A, density 1.44 g/cm3, surface area 3437.56 m2/g, accessible volume 0.33 cm3/g