EuZnC22H10(N2O9)2 crystallizes in the monoclinic P2_1/c space group. Eu(1) is bonded in a distorted pentagonal bipyramidal geometry to one O(11), one O(13), one O(14), one O(3), one O(4), one O(6), and one O(9) atom. The Eu(1)-O(11) bond length is 2.40 Å. The Eu(1)-O(13) bond length is 2.36 Å. The Eu(1)-O(14) bond length is 2.40 Å. The Eu(1)-O(3) bond length is 2.41 Å. The Eu(1)-O(4) bond length is 2.30 Å. The Eu(1)-O(6) bond length is 2.53 Å. The Eu(1)-O(9) bond length is 2.36 Å. Zn(1) is bonded in a distorted tetrahedral geometry to one N(3), one O(10), one O(12), and one O(5) atom. The Zn(1)-N(3) bond length is 2.04 Å. The Zn(1)-O(10) bond length is 1.94 Å. The Zn(1)-O(12) bond length is 1.93 Å. The Zn(1)-O(5) bond length is 1.99 Å. There are twenty-two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(3), and one O(4) atom. The C(1)-C(2) bond length is 1.51 Å. The C(1)-O(3) bond length is 1.26 Å. The C(1)-O(4) bond length is 1.25 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(7) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-C(7) bond length is 1.38 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.39 Å. The C(3)-H(1) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(8) atom. The C(4)-C(5) bond length is 1.38 Å. The C(4)-C(8) bond length is 1.50 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 0.93 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(5), one C(7), and one N(1) atom. The C(6)-C(7) bond length is 1.37 Å. The C(6)-N(1) bond length is 1.48 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one H(3) atom. The C(7)-H(3) bond length is 0.93 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(5), and one O(6) atom. The C(8)-O(5) bond length is 1.26 Å. The C(8)-O(6) bond length is 1.24 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(10), and one O(9) atom. The C(9)-C(10) bond length is 1.50 Å. The C(9)-O(10) bond length is 1.27 Å. The C(9)-O(9) bond length is 1.25 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(9) atom. The C(10)-C(11) bond length is 1.39 Å. The C(10)-C(15) bond length is 1.39 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(10), one C(12), and one H(4) atom. The C(11)-C(12) bond length is 1.38 Å. The C(11)-H(4) bond length is 0.93 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one C(11), one C(13), and one C(16) atom. The C(12)-C(13) bond length is 1.39 Å. The C(12)-C(16) bond length is 1.51 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(12), one C(14), and one H(5) atom. The C(13)-C(14) bond length is 1.37 Å. The C(13)-H(5) bond length is 0.93 Å. In the fourteenth C site, C(14) is bonded in a 4-coordinate geometry to one C(13), one C(15), one N(2), and one N(4) atom. The C(14)-C(15) bond length is 1.37 Å. The C(14)-N(2) bond length is 1.53 Å. The C(14)-N(4) bond length is 1.47 Å. In the fifteenth C site, C(15) is bonded in a distorted trigonal planar geometry to one C(10), one C(14), and one H(6) atom. The C(15)-H(6) bond length is 0.93 Å. In the sixteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(11), and one O(12) atom. The C(16)-O(11) bond length is 1.23 Å. The C(16)-O(12) bond length is 1.26 Å. In the seventeenth C site, C(17) is bonded in a distorted bent 120 degrees geometry to one C(18), one O(13), and one O(14) atom. The C(17)-C(18) bond length is 1.52 Å. The C(17)-O(13) bond length is 1.24 Å. The C(17)-O(14) bond length is 1.25 Å. In the eighteenth C site, C(18) is bonded in a trigonal planar geometry to one C(17), one C(19), and one C(22) atom. The C(18)-C(19) bond length is 1.38 Å. The C(18)-C(22) bond length is 1.38 Å. In the nineteenth C site, C(19) is bonded in a distorted trigonal planar geometry to one C(18), one N(3), and one H(7) atom. The C(19)-N(3) bond length is 1.34 Å. The C(19)-H(7) bond length is 0.93 Å. In the twentieth C site, C(20) is bonded in a distorted trigonal planar geometry to one C(21), one N(3), and one H(8) atom. The C(20)-C(21) bond length is 1.39 Å. The C(20)-N(3) bond length is 1.33 Å. The C(20)-H(8) bond length is 0.93 Å. In the twenty-first C site, C(21) is bonded in a distorted single-bond geometry to one C(20) and one H(9) atom. The C(21)-H(9) bond length is 0.93 Å. In the twenty-second C site, C(22) is bonded in a distorted single-bond geometry to one C(18) and one H(10) atom. The C(22)-H(10) bond length is 0.93 Å. There are four inequivalent N sites. In the first N site, N(2) is bonded in a 3-coordinate geometry to one C(14), one N(4), one O(1), and one O(2) atom. The N(2)-N(4) bond length is 0.74 Å. The N(2)-O(1) bond length is 1.21 Å. The N(2)-O(2) bond length is 1.18 Å. In the second N site, N(3) is bonded in a trigonal planar geometry to one Zn(1), one C(19), and one C(20) atom. In the third N site, N(4) is bonded in a distorted single-bond geometry to one C(14), one N(2), one O(15), and one O(16) atom. The N(4)-O(15) bond length is 1.21 Å. The N(4)-O(16) bond length is 1.17 Å. In the fourth N site, N(1) is bonded in a 5-coordinate geometry to one C(6), one O(17), one O(18), one O(7), and one O(8) atom. The N(1)-O(17) bond length is 1.20 Å. The N(1)-O(18) bond length is 1.31 Å. The N(1)-O(7) bond length is 1.34 Å. The N(1)-O(8) bond length is 1.19 Å. There are ten inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) 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(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(11) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(13) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(15) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(19) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(20) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(21) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(22) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one N(2) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one N(2) and one O(16) atom. The O(2)-O(16) bond length is 1.00 Å. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Eu(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Eu(1) and one C(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Zn(1) and one C(8) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Eu(1) and one C(8) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one N(1) and one O(17) atom. The O(7)-O(17) bond length is 0.70 Å. In the eighth O site, O(8) is bonded in a distorted L-shaped geometry to one N(1) and one O(18) atom. The O(8)-O(18) bond length is 0.83 Å. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one C(9) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(9) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one C(16) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(16) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one C(17) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Eu(1) and one C(17) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one N(4) atom. In the sixteenth O site, O(16) is bonded in an L-shaped geometry to one N(4) and one O(2) atom. In the seventeenth O site, O(17) is bonded in an L-shaped geometry to one N(1) and one O(7) atom. In the eighteenth O site, O(18) is bonded in a 2-coordinate geometry to one N(1) and one O(8) atom. Linkers: 3 O1ON2OON12.[O]C(=O)c1c[c]cc(C([O])=O)c1 ,4 [O]C(=O)c1cccnc1 ,4 [O]C(=O)c1c[c]cc(C([O])=O)c1.[O]O[N]O[O] ,1 [O]C(=O)c1cc(cc(c1)C(=O)[O])[N]12OON2OO1. Metal clusters: 2 O=[C]O[Zn]1O[C]O[Eu]234(O[C]O1)O[C]O[Eu]1(O[C]O[Zn](O[C]=O)O[C]O1)(O[C]O2)(O[C]O3)O[C]O4. The MOF has largest included sphere 4.87 A, density 1.72 g/cm3, surface area 3160.99 m2/g, accessible volume 0.24 cm3/g