Na3ErC14H10(NO4)4 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one H(2), one O(12), one O(13), one O(16), one O(2), one O(4), and one O(8) atom. The Na(1)-H(2) bond length is 2.46 Å. The Na(1)-O(12) bond length is 2.30 Å. The Na(1)-O(13) bond length is 2.53 Å. The Na(1)-O(16) bond length is 2.49 Å. The Na(1)-O(2) bond length is 2.26 Å. The Na(1)-O(4) bond length is 2.42 Å. The Na(1)-O(8) bond length is 2.28 Å. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(10), one O(13), one O(14), one O(3), one O(4), one O(8), and one O(9) atom. The Na(2)-O(10) bond length is 2.39 Å. The Na(2)-O(13) bond length is 2.42 Å. The Na(2)-O(14) bond length is 2.41 Å. The Na(2)-O(3) bond length is 2.83 Å. The Na(2)-O(4) bond length is 2.67 Å. The Na(2)-O(8) bond length is 2.72 Å. The Na(2)-O(9) bond length is 2.39 Å. In the third Na site, Na(3) is bonded in a 5-coordinate geometry to one O(14), one O(15), one O(4), one O(6), and one O(8) atom. The Na(3)-O(14) bond length is 2.41 Å. The Na(3)-O(15) bond length is 2.28 Å. The Na(3)-O(4) bond length is 2.43 Å. The Na(3)-O(6) bond length is 2.41 Å. The Na(3)-O(8) bond length is 2.34 Å. Er(1) is bonded in a 8-coordinate geometry to one N(1), one N(3), one O(1), one O(10), one O(11), one O(3), one O(6), and one O(7) atom. The Er(1)-N(1) bond length is 2.46 Å. The Er(1)-N(3) bond length is 2.45 Å. The Er(1)-O(1) bond length is 2.29 Å. The Er(1)-O(10) bond length is 2.38 Å. The Er(1)-O(11) bond length is 2.37 Å. The Er(1)-O(3) bond length is 2.25 Å. The Er(1)-O(6) bond length is 2.44 Å. The Er(1)-O(7) bond length is 2.22 Å. There are fourteen inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(5), and one N(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(5) bond length is 1.52 Å. The C(1)-N(1) bond length is 1.33 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(1), one N(2), and one H(9) atom. The C(2)-N(2) bond length is 1.34 Å. The C(2)-H(9) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one N(2) atom. The C(3)-C(4) bond length is 1.41 Å. The C(3)-C(6) bond length is 1.51 Å. The C(3)-N(2) bond length is 1.35 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(7), and one N(1) atom. The C(4)-C(7) bond length is 1.52 Å. The C(4)-N(1) bond length is 1.34 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(5)-O(1) bond length is 1.28 Å. The C(5)-O(2) bond length is 1.25 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(6)-O(3) bond length is 1.27 Å. The C(6)-O(4) bond length is 1.26 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(5), and one O(6) atom. The C(7)-O(5) bond length is 1.26 Å. The C(7)-O(6) bond length is 1.28 Å. In the eighth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(12), one C(9), and one N(4) atom. The C(8)-C(12) bond length is 1.51 Å. The C(8)-C(9) bond length is 1.40 Å. The C(8)-N(4) bond length is 1.35 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(8) and one N(3) atom. The C(9)-N(3) 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(14), and one N(3) atom. The C(10)-C(11) bond length is 1.40 Å. The C(10)-C(14) bond length is 1.50 Å. The C(10)-N(3) bond length is 1.33 Å. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(10), one N(4), and one H(10) atom. The C(11)-N(4) bond length is 1.34 Å. The C(11)-H(10) bond length is 1.09 Å. In the twelfth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(7), and one O(8) atom. The C(12)-O(7) bond length is 1.27 Å. The C(12)-O(8) bond length is 1.25 Å. In the thirteenth C site, C(13) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(9) atom. The C(13)-O(10) bond length is 1.28 Å. The C(13)-O(9) bond length is 1.26 Å. In the fourteenth C site, C(14) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(11), and one O(12) atom. The C(14)-O(11) bond length is 1.31 Å. The C(14)-O(12) bond length is 1.24 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Er(1), one C(1), and one C(4) atom. In the second N site, N(2) is bonded in a bent 120 degrees geometry to one C(2) and one C(3) atom. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Er(1), one C(10), and one C(9) atom. In the fourth N site, N(4) is bonded in a bent 120 degrees geometry to one C(11) and one C(8) atom. There are ten inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(13) atom. The H(1)-O(13) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one Na(1) and one O(13) atom. The H(2)-O(13) bond length is 0.98 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(14) atom. The H(3)-O(14) bond length is 0.98 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(14) atom. The H(4)-O(14) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(15) atom. The H(5)-O(15) bond length is 0.99 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(15) atom. The H(6)-O(15) bond length is 0.99 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(16) atom. The H(7)-O(16) bond length is 0.98 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(16) atom. The H(8)-O(16) bond length is 0.99 Å. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(2) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(11) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Er(1) and one C(5) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Na(1) and one C(5) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Na(2), one Er(1), and one C(6) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), and one C(6) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(7) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(3), one Er(1), and one C(7) atom. In the seventh O site, O(7) is bonded in a linear geometry to one Er(1) and one C(12) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), and one C(12) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Na(2) and one C(13) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Na(2), one Er(1), and one C(13) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Er(1) and one C(14) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one C(14) atom. In the thirteenth O site, O(13) is bonded in a distorted water-like geometry to one Na(1), one Na(2), one H(1), and one H(2) atom. In the fourteenth O site, O(14) is bonded in a distorted water-like geometry to one Na(2), one Na(3), one H(3), and one H(4) atom. In the fifteenth O site, O(15) is bonded in a distorted water-like geometry to one Na(3), one H(5), and one H(6) atom. In the sixteenth O site, O(16) is bonded in a distorted water-like geometry to one Na(1), one H(7), and one H(8) atom. Linkers: 3 [O]C(=O)c1cnc(C([O])=O)c(C([O])=O)n1. Metal clusters: 6 [Na] ,2 [Er]. The MOF has largest included sphere 2.65 A, density 2.17 g/cm3, surface area 2406.60 m2/g, accessible volume 0.09 cm3/g