Er2Cu3C24H30(NO4)6 crystallizes in the trigonal P3c1 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(5), and three equivalent O(8) atoms. All Er(1)-O(1) bond lengths are 2.33 Å. All Er(1)-O(5) bond lengths are 2.63 Å. All Er(1)-O(8) bond lengths are 2.25 Å. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(7) atoms. All Er(2)-O(3) bond lengths are 2.35 Å. All Er(2)-O(7) bond lengths are 2.30 Å. Cu(1) is bonded in a distorted octahedral geometry to one N(1), one N(2), one O(1), one O(2), one O(3), and one O(4) atom. The Cu(1)-N(1) bond length is 1.98 Å. The Cu(1)-N(2) bond length is 2.01 Å. The Cu(1)-O(1) bond length is 2.40 Å. The Cu(1)-O(2) bond length is 1.97 Å. The Cu(1)-O(3) bond length is 2.44 Å. The Cu(1)-O(4) bond length is 1.93 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(8) atom. The C(1)-O(2) bond length is 1.29 Å. The C(1)-O(8) bond length is 1.20 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(7) atom. The C(2)-O(4) bond length is 1.26 Å. The C(2)-O(7) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one H(3), and one H(4) atom. The C(3)-N(1) bond length is 1.37 Å. The C(3)-H(3) bond length is 0.97 Å. The C(3)-H(4) bond length is 0.97 Å. In the fourth C site, C(4) is bonded in a 2-coordinate geometry to one N(2) and two equivalent H(5,6) atoms. The C(4)-N(2) bond length is 1.60 Å. Both C(4)-H(5,6) bond lengths are 0.97 Å. In the fifth C site, C(5) is bonded in a 3-coordinate geometry to one N(1), one H(7), and one H(8) atom. The C(5)-N(1) bond length is 1.46 Å. The C(5)-H(7) bond length is 0.97 Å. The C(5)-H(8) bond length is 0.97 Å. In the sixth C site, C(6) is bonded in a distorted trigonal non-coplanar geometry to one N(2) and two equivalent H(9,10) atoms. The C(6)-N(2) bond length is 1.49 Å. Both C(6)-H(9,10) bond lengths are 0.97 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(5) atom. The C(7)-O(1) bond length is 1.23 Å. The C(7)-O(5) bond length is 1.31 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(6) atom. The C(8)-O(3) bond length is 1.27 Å. The C(8)-O(6) bond length is 1.17 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Cu(1), one C(3), one C(5), and one H(1) atom to form distorted corner-sharing NCuHC2 tetrahedra. The N(1)-H(1) bond length is 0.91 Å. In the second N site, N(2) is bonded to one Cu(1), one C(4), one C(6), and one H(2) atom to form distorted corner-sharing NCuHC2 tetrahedra. The N(2)-H(2) bond length is 0.91 Å. There are eight 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(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. In the fifth H site, H(5,6) is bonded in a single-bond geometry to one C(4) atom. In the sixth H site, H(7) is bonded in a single-bond geometry to one C(5) atom. In the seventh H site, H(8) is bonded in a single-bond geometry to one C(5) atom. In the eighth H site, H(9,10) is bonded in a single-bond geometry to one C(6) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Er(1), 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(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Er(2), one Cu(1), and one C(8) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Er(1) and one C(7) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(8) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Er(2) and one C(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Er(1) and one C(1) atom. Linkers: 12 [O]C(=O)CNCC([O])=O. Metal clusters: 4 [Er] ,6 [Cu]. The MOF has largest included sphere 7.13 A, density 1.98 g/cm3, surface area 2609.09 m2/g, accessible volume 0.20 cm3/g