Eu4Co3C48H12(NO6)6 crystallizes in the monoclinic C2/c space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one N(3), one O(1), one O(13), one O(16), one O(18), one O(2), one O(4), and one O(9) atom. The Eu(1)-N(3) bond length is 2.57 Å. The Eu(1)-O(1) bond length is 2.56 Å. The Eu(1)-O(13) bond length is 2.43 Å. The Eu(1)-O(16) bond length is 2.44 Å. The Eu(1)-O(18) bond length is 2.39 Å. The Eu(1)-O(2) bond length is 2.65 Å. The Eu(1)-O(4) bond length is 2.38 Å. The Eu(1)-O(9) bond length is 2.33 Å. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to two equivalent O(10), two equivalent O(15), two equivalent O(5), and two equivalent O(6) atoms. Both Eu(2)-O(10) bond lengths are 2.29 Å. Both Eu(2)-O(15) bond lengths are 2.44 Å. Both Eu(2)-O(5) bond lengths are 2.50 Å. Both Eu(2)-O(6) bond lengths are 2.54 Å. In the third Eu site, Eu(3) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms. Both Eu(3)-O(3) bond lengths are 2.31 Å. Both Eu(3)-O(7) bond lengths are 2.50 Å. Both Eu(3)-O(8) bond lengths are 2.57 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a distorted octahedral geometry to one N(1), one N(2), one O(1), one O(12), one O(6), and one O(7) atom. The Co(1)-N(1) bond length is 2.00 Å. The Co(1)-N(2) bond length is 2.01 Å. The Co(1)-O(1) bond length is 2.11 Å. The Co(1)-O(12) bond length is 2.10 Å. The Co(1)-O(6) bond length is 2.19 Å. The Co(1)-O(7) bond length is 2.17 Å. In the second Co site, Co(2) is bonded in a linear geometry to two equivalent O(14) atoms. Both Co(2)-O(14) bond lengths are 2.11 Å. There are twenty-four inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one N(1) atom. The C(1)-N(1) bond length is 1.34 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(3) and one H(1) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-H(1) bond length is 0.93 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(7) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(7) bond length is 1.52 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(2) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-H(2) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(8), and one N(1) atom. The C(5)-C(8) bond length is 1.51 Å. The C(5)-N(1) bond length is 1.31 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(6)-O(1) bond length is 1.26 Å. The C(6)-O(2) bond length is 1.21 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.22 Å. The C(7)-O(4) bond length is 1.24 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(5), and one O(6) atom. The C(8)-O(5) bond length is 1.22 Å. The C(8)-O(6) bond length is 1.29 Å. In the ninth C site, C(9) is bonded in a distorted trigonal planar geometry to one C(10), one C(14), and one N(2) atom. The C(9)-C(10) bond length is 1.36 Å. The C(9)-C(14) bond length is 1.50 Å. The C(9)-N(2) bond length is 1.34 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(11), one C(9), and one H(3) atom. The C(10)-C(11) bond length is 1.41 Å. The C(10)-H(3) bond length is 0.93 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(10), one C(12), and one C(15) atom. The C(11)-C(12) bond length is 1.39 Å. The C(11)-C(15) bond length is 1.50 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(4) atom. The C(12)-C(13) bond length is 1.38 Å. The C(12)-H(4) bond length is 0.93 Å. In the thirteenth C site, C(13) is bonded in a distorted trigonal planar geometry to one C(12), one C(16), and one N(2) atom. The C(13)-C(16) bond length is 1.52 Å. The C(13)-N(2) bond length is 1.32 Å. In the fourteenth C site, C(14) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(7), and one O(8) atom. The C(14)-O(7) bond length is 1.29 Å. The C(14)-O(8) bond length is 1.24 Å. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(11), one O(10), and one O(9) atom. The C(15)-O(10) bond length is 1.23 Å. The C(15)-O(9) bond length is 1.22 Å. In the sixteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one C(13), one O(11), and one O(12) atom. The C(16)-O(11) bond length is 1.21 Å. The C(16)-O(12) bond length is 1.29 Å. In the seventeenth C site, C(17) is bonded in a distorted trigonal planar geometry to one C(18), one C(22), and one N(3) atom. The C(17)-C(18) bond length is 1.37 Å. The C(17)-C(22) bond length is 1.51 Å. The C(17)-N(3) bond length is 1.35 Å. In the eighteenth C site, C(18) is bonded in a distorted single-bond geometry to one C(17), one C(19), and one H(5) atom. The C(18)-C(19) bond length is 1.39 Å. The C(18)-H(5) bond length is 0.93 Å. In the nineteenth C site, C(19) is bonded in a trigonal planar geometry to one C(18), one C(20), and one C(23) atom. The C(19)-C(20) bond length is 1.38 Å. The C(19)-C(23) bond length is 1.52 Å. In the twentieth C site, C(20) is bonded in a distorted single-bond geometry to one C(19), one C(21), and one H(6) atom. The C(20)-C(21) bond length is 1.40 Å. The C(20)-H(6) bond length is 0.93 Å. In the twenty-first C site, C(21) is bonded in a distorted trigonal planar geometry to one C(20), one C(24), and one N(3) atom. The C(21)-C(24) bond length is 1.51 Å. The C(21)-N(3) bond length is 1.35 Å. In the twenty-second C site, C(22) is bonded in a distorted bent 120 degrees geometry to one C(17), one O(13), and one O(14) atom. The C(22)-O(13) bond length is 1.30 Å. The C(22)-O(14) bond length is 1.23 Å. In the twenty-third C site, C(23) is bonded in a distorted bent 120 degrees geometry to one C(19), one O(15), and one O(16) atom. The C(23)-O(15) bond length is 1.25 Å. The C(23)-O(16) bond length is 1.25 Å. In the twenty-fourth C site, C(24) is bonded in a distorted bent 120 degrees geometry to one C(21), one O(17), and one O(18) atom. The C(24)-O(17) bond length is 1.22 Å. The C(24)-O(18) bond length is 1.29 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Co(1), one C(1), and one C(5) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Co(1), one C(13), and one C(9) atom. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Eu(1), one C(17), and one C(21) atom. There are six 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(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(10) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(12) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(18) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(20) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Eu(1), one Co(1), and one C(6) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Eu(1) and one C(6) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one Eu(3) and one C(7) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Eu(1) and one C(7) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Eu(2) and one C(8) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Eu(2), one Co(1), and one C(8) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Eu(3), one Co(1), and one C(14) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Eu(3) and one C(14) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one C(15) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Eu(2) and one C(15) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one C(16) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Co(1) and one C(16) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Eu(1) and one C(22) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one C(22) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Eu(2) and one C(23) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Eu(1) and one C(23) atom. In the seventeenth O site, O(17) is bonded in a single-bond geometry to one C(24) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 120 degrees geometry to one Eu(1) and one C(24) atom. Linkers: 12 [O]C(=O)c1cc(C([O])=O)nc(C([O])=O)c1. Metal clusters: 8 [Eu] ,6 [Co]. The MOF has largest included sphere 5.54 A, density 2.01 g/cm3, surface area 2703.66 m2/g, accessible volume 0.17 cm3/g