Eu2Cu3C42H18(NO4)6 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 4-coordinate geometry to one O(12), one O(13), one O(19), and one O(6) atom. The Eu(1)-O(12) bond length is 2.53 Å. The Eu(1)-O(13) bond length is 2.54 Å. The Eu(1)-O(19) bond length is 2.44 Å. The Eu(1)-O(6) bond length is 2.48 Å. In the second Eu site, Eu(2) is bonded in a 5-coordinate geometry to one O(14), one O(16), one O(17), one O(24), and one O(7) atom. The Eu(2)-O(14) bond length is 2.54 Å. The Eu(2)-O(16) bond length is 2.51 Å. The Eu(2)-O(17) bond length is 2.51 Å. The Eu(2)-O(24) bond length is 2.36 Å. The Eu(2)-O(7) bond length is 2.44 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to one N(2), one N(6), one O(18), and one O(3) atom. The Cu(1)-N(2) bond length is 2.01 Å. The Cu(1)-N(6) bond length is 1.99 Å. The Cu(1)-O(18) bond length is 1.98 Å. The Cu(1)-O(3) bond length is 1.99 Å. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one N(4), one N(5), one O(15), and one O(22) atom. The Cu(2)-N(4) bond length is 2.02 Å. The Cu(2)-N(5) bond length is 2.01 Å. The Cu(2)-O(15) bond length is 1.98 Å. The Cu(2)-O(22) bond length is 1.98 Å. In the third Cu site, Cu(3) is bonded in a rectangular see-saw-like geometry to one N(1), one N(3), one O(11), and one O(2) atom. The Cu(3)-N(1) bond length is 2.00 Å. The Cu(3)-N(3) bond length is 1.99 Å. The Cu(3)-O(11) bond length is 2.03 Å. The Cu(3)-O(2) bond length is 2.01 Å. There are forty-two inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(30), one N(5), and one H(8) atom. The C(1)-C(30) bond length is 1.38 Å. The C(1)-N(5) bond length is 1.34 Å. The C(1)-H(8) bond length is 0.95 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(16), one O(1), and one O(15) atom. The C(2)-C(16) bond length is 1.51 Å. The C(2)-O(1) bond length is 1.23 Å. The C(2)-O(15) bond length is 1.28 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(11), one C(37), and one C(5) atom. The C(3)-C(11) bond length is 1.50 Å. The C(3)-C(37) bond length is 1.40 Å. The C(3)-C(5) bond length is 1.39 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(37), one O(11), and one O(8) atom. The C(4)-C(37) bond length is 1.52 Å. The C(4)-O(11) bond length is 1.28 Å. The C(4)-O(8) bond length is 1.24 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(3), one N(6), and one H(5) atom. The C(5)-N(6) bond length is 1.34 Å. The C(5)-H(5) bond length is 0.95 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(33), one O(10), and one O(18) atom. The C(6)-C(33) bond length is 1.51 Å. The C(6)-O(10) bond length is 1.25 Å. The C(6)-O(18) bond length is 1.27 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(17), one C(24), and one C(26) atom. The C(7)-C(17) bond length is 1.39 Å. The C(7)-C(24) bond length is 1.38 Å. The C(7)-C(26) bond length is 1.51 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(33) and one H(13) atom. The C(8)-C(33) bond length is 1.38 Å. The C(8)-H(13) bond length is 0.95 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one N(6) and one H(6) atom. The C(9)-N(6) bond length is 1.35 Å. The C(9)-H(6) bond length is 0.95 Å. In the tenth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one N(4) and one H(7) atom. The C(10)-N(4) bond length is 1.35 Å. The C(10)-H(7) bond length is 0.95 Å. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(16), and one O(17) atom. The C(11)-O(16) bond length is 1.27 Å. The C(11)-O(17) bond length is 1.25 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one C(13), one C(21), and one C(40) atom. The C(12)-C(13) bond length is 1.38 Å. The C(12)-C(21) bond length is 1.50 Å. The C(12)-C(40) bond length is 1.39 Å. In the thirteenth C site, C(13) is bonded in a trigonal planar geometry to one C(12), one C(31), and one C(35) atom. The C(13)-C(31) bond length is 1.39 Å. The C(13)-C(35) bond length is 1.52 Å. In the fourteenth C site, C(14) is bonded in a distorted bent 120 degrees geometry to one N(5) and one H(17) atom. The C(14)-N(5) bond length is 1.34 Å. The C(14)-H(17) bond length is 0.95 Å. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(25), one O(14), and one O(7) atom. The C(15)-C(25) bond length is 1.49 Å. The C(15)-O(14) bond length is 1.26 Å. The C(15)-O(7) bond length is 1.27 Å. In the sixteenth C site, C(16) is bonded in a trigonal planar geometry to one C(2), one C(23), and one C(25) atom. The C(16)-C(23) bond length is 1.39 Å. The C(16)-C(25) bond length is 1.40 Å. In the seventeenth C site, C(17) is bonded in a 3-coordinate geometry to one C(7), one N(1), and one H(4) atom. The C(17)-N(1) bond length is 1.34 Å. The C(17)-H(4) bond length is 0.95 Å. In the eighteenth C site, C(18) is bonded in a trigonal planar geometry to one C(28), one C(30), and one C(36) atom. The C(18)-C(28) bond length is 1.52 Å. The C(18)-C(30) bond length is 1.39 Å. The C(18)-C(36) bond length is 1.38 Å. In the nineteenth C site, C(19) is bonded in a distorted bent 120 degrees geometry to one C(39), one O(24), and one O(4) atom. The C(19)-C(39) bond length is 1.51 Å. The C(19)-O(24) bond length is 1.25 Å. The C(19)-O(4) bond length is 1.25 Å. In the twentieth C site, C(20) is bonded in a distorted single-bond geometry to one C(37) and one H(10) atom. The C(20)-C(37) bond length is 1.39 Å. The C(20)-H(10) bond length is 0.95 Å. In the twenty-first C site, C(21) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(13), and one O(19) atom. The C(21)-O(13) bond length is 1.24 Å. The C(21)-O(19) bond length is 1.27 Å. In the twenty-second C site, C(22) is bonded in a distorted bent 120 degrees geometry to one N(3) and one H(2) atom. The C(22)-N(3) bond length is 1.35 Å. The C(22)-H(2) bond length is 0.95 Å. In the twenty-third C site, C(23) is bonded in a distorted trigonal planar geometry to one C(16), one C(27), and one H(9) atom. The C(23)-C(27) bond length is 1.38 Å. The C(23)-H(9) bond length is 0.95 Å. In the twenty-fourth C site, C(24) is bonded in a trigonal planar geometry to one C(29), one C(34), and one C(7) atom. The C(24)-C(29) bond length is 1.51 Å. The C(24)-C(34) bond length is 1.41 Å. In the twenty-fifth C site, C(25) is bonded in a trigonal planar geometry to one C(15), one C(16), and one C(38) atom. The C(25)-C(38) bond length is 1.39 Å. In the twenty-sixth C site, C(26) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(23), and one O(9) atom. The C(26)-O(23) bond length is 1.25 Å. The C(26)-O(9) bond length is 1.26 Å. In the twenty-seventh C site, C(27) is bonded in a distorted bent 120 degrees geometry to one C(23), one N(2), and one H(16) atom. The C(27)-N(2) bond length is 1.34 Å. The C(27)-H(16) bond length is 0.95 Å. In the twenty-eighth C site, C(28) is bonded in a distorted bent 120 degrees geometry to one C(18), one O(2), and one O(21) atom. The C(28)-O(2) bond length is 1.27 Å. The C(28)-O(21) bond length is 1.24 Å. In the twenty-ninth C site, C(29) is bonded in a distorted bent 120 degrees geometry to one C(24), one O(20), and one O(22) atom. The C(29)-O(20) bond length is 1.24 Å. The C(29)-O(22) bond length is 1.27 Å. In the thirtieth C site, C(30) is bonded in a trigonal planar geometry to one C(1), one C(18), and one C(32) atom. The C(30)-C(32) bond length is 1.50 Å. In the thirty-first C site, C(31) is bonded in a distorted single-bond geometry to one C(13) and one H(12) atom. The C(31)-H(12) bond length is 0.95 Å. In the thirty-second C site, C(32) is bonded in a distorted bent 120 degrees geometry to one C(30), one O(12), and one O(6) atom. The C(32)-O(12) bond length is 1.26 Å. The C(32)-O(6) bond length is 1.27 Å. In the thirty-third C site, C(33) is bonded in a trigonal planar geometry to one C(39), one C(6), and one C(8) atom. The C(33)-C(39) bond length is 1.40 Å. In the thirty-fourth C site, C(34) is bonded in a distorted single-bond geometry to one C(24) and one H(1) atom. The C(34)-H(1) bond length is 0.95 Å. In the thirty-fifth C site, C(35) is bonded in a distorted bent 120 degrees geometry to one C(13), one O(3), and one O(5) atom. The C(35)-O(3) bond length is 1.27 Å. The C(35)-O(5) bond length is 1.24 Å. In the thirty-sixth C site, C(36) is bonded in a distorted single-bond geometry to one C(18) and one H(3) atom. The C(36)-H(3) bond length is 0.95 Å. In the thirty-seventh C site, C(37) is bonded in a trigonal planar geometry to one C(20), one C(3), and one C(4) atom. In the thirty-eighth C site, C(38) is bonded in a 2-coordinate geometry to one C(25), one N(2), and one H(18) atom. The C(38)-N(2) bond length is 1.34 Å. The C(38)-H(18) bond length is 0.95 Å. In the thirty-ninth C site, C(39) is bonded in a trigonal planar geometry to one C(19), one C(33), and one C(42) atom. The C(39)-C(42) bond length is 1.38 Å. In the fortieth C site, C(40) is bonded in a distorted trigonal planar geometry to one C(12), one N(4), and one H(14) atom. The C(40)-N(4) bond length is 1.35 Å. The C(40)-H(14) bond length is 0.95 Å. In the forty-first C site, C(41) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(15) atom. The C(41)-N(1) bond length is 1.33 Å. The C(41)-H(15) bond length is 0.95 Å. In the forty-second C site, C(42) is bonded in a distorted bent 120 degrees geometry to one C(39), one N(3), and one H(11) atom. The C(42)-N(3) bond length is 1.35 Å. The C(42)-H(11) bond length is 0.95 Å. There are six inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Cu(3), one C(17), and one C(41) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Cu(1), one C(27), and one C(38) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one Cu(3), one C(22), and one C(42) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Cu(2), one C(10), and one C(40) atom. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one Cu(2), one C(1), and one C(14) atom. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one Cu(1), one C(5), and one C(9) atom. There are eighteen inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(34) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(22) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(36) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(17) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(5) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(9) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(10) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(1) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(23) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(20) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(42) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(31) atom. In the thirteenth H site, H(13) is bonded in a single-bond geometry to one C(8) atom. In the fourteenth H site, H(14) is bonded in a single-bond geometry to one C(40) atom. In the fifteenth H site, H(15) is bonded in a single-bond geometry to one C(41) atom. In the sixteenth H site, H(16) is bonded in a single-bond geometry to one C(27) atom. In the seventeenth H site, H(17) is bonded in a single-bond geometry to one C(14) atom. In the eighteenth H site, H(18) is bonded in a single-bond geometry to one C(38) atom. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one C(2) atom. In the second O site, O(2) is bonded in a water-like geometry to one Cu(3) and one C(28) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(35) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(19) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(35) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one Eu(1) and one C(32) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Eu(2) and one C(15) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one C(4) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one C(26) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one C(6) atom. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Cu(3) and one C(4) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Eu(1) and one C(32) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Eu(1) and one C(21) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Eu(2) and one C(15) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(2) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Eu(2) and one C(11) atom. In the seventeenth O site, O(17) is bonded in a distorted single-bond geometry to one Eu(2) and one C(11) atom. In the eighteenth O site, O(18) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(6) atom. In the nineteenth O site, O(19) is bonded in a single-bond geometry to one Eu(1) and one C(21) atom. In the twentieth O site, O(20) is bonded in a single-bond geometry to one C(29) atom. In the twenty-first O site, O(21) is bonded in a single-bond geometry to one C(28) atom. In the twenty-second O site, O(22) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(29) atom. In the twenty-third O site, O(23) is bonded in a single-bond geometry to one C(26) atom. In the twenty-fourth O site, O(24) is bonded in a distorted bent 150 degrees geometry to one Eu(2) and one C(19) atom. Linkers: 24 [O]C(=O)c1ccncc1C([O])=O. Metal clusters: 4 [C]1O[Eu]2(O1)O[C]O2 ,4 O=[C]O[Eu]12(O[C]O1)O[C]O2 ,12 O=[C]O[Cu]O[C]=O. The MOF has largest included sphere 8.05 A, density 1.14 g/cm3, surface area 3495.91 m2/g, accessible volume 0.43 cm3/g