EuC8NH2O6 crystallizes in the triclinic P-1 space group. There are five inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one N(1), one N(2), one O(1), one O(12), one O(28), one O(3), one O(6), and one O(7) atom. The Eu(1)-N(1) bond length is 2.54 Å. The Eu(1)-N(2) bond length is 2.53 Å. The Eu(1)-O(1) bond length is 2.48 Å. The Eu(1)-O(12) bond length is 2.41 Å. The Eu(1)-O(28) bond length is 2.33 Å. The Eu(1)-O(3) bond length is 2.39 Å. The Eu(1)-O(6) bond length is 2.46 Å. The Eu(1)-O(7) bond length is 2.45 Å. In the second Eu site, Eu(2) is bonded in a 7-coordinate geometry to one N(3), one O(13), one O(16), one O(18), one O(2), one O(20), and one O(26) atom. The Eu(2)-N(3) bond length is 2.55 Å. The Eu(2)-O(13) bond length is 2.46 Å. The Eu(2)-O(16) bond length is 2.49 Å. The Eu(2)-O(18) bond length is 2.38 Å. The Eu(2)-O(2) bond length is 2.45 Å. The Eu(2)-O(20) bond length is 2.35 Å. The Eu(2)-O(26) bond length is 2.44 Å. In the third Eu site, Eu(3) is bonded in a 7-coordinate geometry to one N(4), one O(17), one O(19), one O(21), one O(24), one O(29), and one O(8) atom. The Eu(3)-N(4) bond length is 2.53 Å. The Eu(3)-O(17) bond length is 2.40 Å. The Eu(3)-O(19) bond length is 2.40 Å. The Eu(3)-O(21) bond length is 2.30 Å. The Eu(3)-O(24) bond length is 2.47 Å. The Eu(3)-O(29) bond length is 2.41 Å. The Eu(3)-O(8) bond length is 2.34 Å. In the fourth Eu site, Eu(4) is bonded in a distorted pentagonal bipyramidal geometry to one N(5), one O(10), one O(22), one O(23), one O(24), one O(25), and one O(30) atom. The Eu(4)-N(5) bond length is 2.47 Å. The Eu(4)-O(10) bond length is 2.33 Å. The Eu(4)-O(22) bond length is 2.37 Å. The Eu(4)-O(23) bond length is 2.53 Å. The Eu(4)-O(24) bond length is 2.50 Å. The Eu(4)-O(25) bond length is 2.42 Å. The Eu(4)-O(30) bond length is 2.41 Å. In the fifth Eu site, Eu(5) is bonded in a distorted pentagonal pyramidal geometry to one O(13), one O(14), one O(15), one O(27), one O(4), and one O(5) atom. The Eu(5)-O(13) bond length is 2.49 Å. The Eu(5)-O(14) bond length is 2.71 Å. The Eu(5)-O(15) bond length is 2.38 Å. The Eu(5)-O(27) bond length is 2.29 Å. The Eu(5)-O(4) bond length is 2.43 Å. The Eu(5)-O(5) bond length is 2.34 Å. There are forty 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 1.33 Å. In the second C site, C(2) is bonded in a single-bond geometry to one C(3) and one H(1) atom. The C(2)-C(3) bond length is 1.37 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 1.38 Å. The C(3)-C(7) bond length is 1.51 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3) and one H(2) atom. The C(4)-H(2) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one N(1) atom. The C(5)-N(1) bond length is 1.33 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 1.24 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 1.25 Å. The C(7)-O(4) bond length is 1.25 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(8)-O(5) bond length is 1.24 Å. The C(8)-O(6) bond length is 1.26 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 1.39 Å. The C(9)-C(14) bond length is 1.53 Å. The C(9)-N(2) bond length is 1.33 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 1.40 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 1.52 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(11) and one H(4) atom. The C(12)-H(4) bond length is 0.93 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one N(2) atom. The C(13)-N(2) bond length is 1.34 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 1.26 Å. The C(14)-O(8) bond length is 1.22 Å. In the fifteenth C site, C(15) is bonded in a bent 120 degrees geometry to one C(11), one O(10), and one O(9) atom. The C(15)-O(10) bond length is 1.27 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 O(11) and one O(12) atom. The C(16)-O(11) bond length is 1.22 Å. The C(16)-O(12) bond length is 1.28 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 1.40 Å. The C(17)-C(22) bond length is 1.52 Å. The C(17)-N(3) bond length is 1.33 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 1.40 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 1.40 Å. The C(19)-C(23) bond length is 1.51 Å. In the twentieth C site, C(20) is bonded in a distorted single-bond geometry to one C(19) and one H(6) atom. The C(20)-H(6) bond length is 0.93 Å. In the twenty-first C site, C(21) is bonded in a distorted single-bond geometry to one N(3) atom. The C(21)-N(3) bond length is 1.33 Å. In the twenty-second C site, C(22) is bonded in a bent 120 degrees geometry to one C(17), one O(13), and one O(14) atom. The C(22)-O(13) bond length is 1.27 Å. The C(22)-O(14) bond length is 1.25 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 1.24 Å. The C(23)-O(16) bond length is 1.24 Å. In the twenty-fourth C site, C(24) is bonded in a distorted bent 120 degrees geometry to one O(17) and one O(18) atom. The C(24)-O(17) bond length is 1.26 Å. The C(24)-O(18) bond length is 1.24 Å. In the twenty-fifth C site, C(25) is bonded in a distorted trigonal planar geometry to one C(26), one C(30), and one N(4) atom. The C(25)-C(26) bond length is 1.38 Å. The C(25)-C(30) bond length is 1.51 Å. The C(25)-N(4) bond length is 1.33 Å. In the twenty-sixth C site, C(26) is bonded in a distorted single-bond geometry to one C(25), one C(27), and one H(7) atom. The C(26)-C(27) bond length is 1.39 Å. The C(26)-H(7) bond length is 0.93 Å. In the twenty-seventh C site, C(27) is bonded in a trigonal planar geometry to one C(26), one C(28), and one C(31) atom. The C(27)-C(28) bond length is 1.39 Å. The C(27)-C(31) bond length is 1.51 Å. In the twenty-eighth C site, C(28) is bonded in a distorted single-bond geometry to one C(27), one C(29), and one H(8) atom. The C(28)-C(29) bond length is 1.38 Å. The C(28)-H(8) bond length is 0.93 Å. In the twenty-ninth C site, C(29) is bonded in a distorted trigonal planar geometry to one C(28), one C(32), and one N(4) atom. The C(29)-C(32) bond length is 1.49 Å. The C(29)-N(4) bond length is 1.35 Å. In the thirtieth C site, C(30) is bonded in a distorted bent 120 degrees geometry to one C(25), one O(19), and one O(20) atom. The C(30)-O(19) bond length is 1.26 Å. The C(30)-O(20) bond length is 1.25 Å. In the thirty-first C site, C(31) is bonded in a distorted bent 120 degrees geometry to one C(27), one O(21), and one O(22) atom. The C(31)-O(21) bond length is 1.25 Å. The C(31)-O(22) bond length is 1.25 Å. In the thirty-second C site, C(32) is bonded in a bent 120 degrees geometry to one C(29), one O(23), and one O(24) atom. The C(32)-O(23) bond length is 1.25 Å. The C(32)-O(24) bond length is 1.28 Å. In the thirty-third C site, C(33) is bonded in a distorted single-bond geometry to one N(5) atom. The C(33)-N(5) bond length is 1.34 Å. In the thirty-fourth C site, C(34) is bonded in a distorted single-bond geometry to one C(35) and one H(9) atom. The C(34)-C(35) bond length is 1.40 Å. The C(34)-H(9) bond length is 0.93 Å. In the thirty-fifth C site, C(35) is bonded in a trigonal planar geometry to one C(34), one C(36), and one C(39) atom. The C(35)-C(36) bond length is 1.38 Å. The C(35)-C(39) bond length is 1.52 Å. In the thirty-sixth C site, C(36) is bonded in a distorted single-bond geometry to one C(35) and one H(10) atom. The C(36)-H(10) bond length is 0.93 Å. In the thirty-seventh C site, C(37) is bonded in a distorted single-bond geometry to one N(5) atom. The C(37)-N(5) bond length is 1.33 Å. In the thirty-eighth C site, C(38) is bonded in a distorted bent 120 degrees geometry to one O(25) and one O(26) atom. The C(38)-O(25) bond length is 1.27 Å. The C(38)-O(26) bond length is 1.24 Å. In the thirty-ninth C site, C(39) is bonded in a distorted bent 120 degrees geometry to one C(35), one O(27), and one O(28) atom. The C(39)-O(27) bond length is 1.25 Å. The C(39)-O(28) bond length is 1.25 Å. In the fortieth C site, C(40) is bonded in a distorted bent 120 degrees geometry to one O(29) and one O(30) atom. The C(40)-O(29) bond length is 1.24 Å. The C(40)-O(30) bond length is 1.26 Å. There are five inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Eu(1), one C(1), and one C(5) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Eu(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(2), one C(17), and one C(21) atom. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one Eu(3), one C(25), and one C(29) atom. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one Eu(4), one C(33), and one C(37) atom. There are ten 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. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(26) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(28) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(34) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(36) atom. There are thirty inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Eu(1) and one C(6) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Eu(2) and one C(6) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one C(7) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Eu(5) and one C(7) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Eu(5) and one C(8) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Eu(1) and one C(8) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Eu(1) and one C(14) atom. In the eighth O site, O(8) is bonded in a distorted linear geometry to one Eu(3) and one C(14) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one C(15) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Eu(4) 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 distorted bent 120 degrees geometry to one Eu(1) and one C(16) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Eu(2), one Eu(5), and one C(22) atom. In the fourteenth O site, O(14) is bonded in a single-bond geometry to one Eu(5) and one C(22) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one Eu(5) and one C(23) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Eu(2) and one C(23) atom. In the seventeenth O site, O(17) is bonded in a distorted single-bond geometry to one Eu(3) and one C(24) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 120 degrees geometry to one Eu(2) and one C(24) atom. In the nineteenth O site, O(19) is bonded in a bent 120 degrees geometry to one Eu(3) and one C(30) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Eu(2) and one C(30) atom. In the twenty-first O site, O(21) is bonded in a bent 150 degrees geometry to one Eu(3) and one C(31) atom. In the twenty-second O site, O(22) is bonded in a distorted bent 150 degrees geometry to one Eu(4) and one C(31) atom. In the twenty-third O site, O(23) is bonded in a distorted single-bond geometry to one Eu(4) and one C(32) atom. In the twenty-fourth O site, O(24) is bonded in a distorted single-bond geometry to one Eu(3), one Eu(4), and one C(32) atom. In the twenty-fifth O site, O(25) is bonded in a bent 120 degrees geometry to one Eu(4) and one C(38) atom. In the twenty-sixth O site, O(26) is bonded in a distorted linear geometry to one Eu(2) and one C(38) atom. In the twenty-seventh O site, O(27) is bonded in a distorted bent 150 degrees geometry to one Eu(5) and one C(39) atom. In the twenty-eighth O site, O(28) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one C(39) atom. In the twenty-ninth O site, O(29) is bonded in a bent 150 degrees geometry to one Eu(3) and one C(40) atom. In the thirtieth O site, O(30) is bonded in a distorted bent 120 degrees geometry to one Eu(4) and one C(40) atom. Linkers: 10 [O]C(=O)c1cc(C([O])=O)nc(C([O])=O)c1. Metal clusters: 10 [Eu]. The MOF has largest included sphere 4.23 A, density 2.16 g/cm3, surface area 2512.51 m2/g, accessible volume 0.12 cm3/g