ErC16H16(NO)8 crystallizes in the tetragonal I4_1/acd space group. Er(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Er(1)-O(1) bond lengths are 2.30 Å. All Er(1)-O(2) bond lengths are 2.33 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one H(1) atom. The C(1)-C(2) bond length is 1.37 Å. The C(1)-N(1) bond length is 1.35 Å. The C(1)-H(1) 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(1), one N(1), and one H(2) atom. The C(2)-N(1) bond length is 1.36 Å. The C(2)-H(2) bond length is 0.95 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(4), one N(2), and one H(3) atom. The C(3)-C(4) bond length is 1.37 Å. The C(3)-N(2) bond length is 1.35 Å. The C(3)-H(3) bond length is 0.95 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one N(2), and one H(4) atom. The C(4)-N(2) bond length is 1.36 Å. The C(4)-H(4) bond length is 0.95 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(1), one C(2), and one O(1) atom. The N(1)-O(1) bond length is 1.31 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(3), one C(4), and one O(2) atom. The N(2)-O(2) bond length is 1.30 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(4) atom. There are two inequivalent O sites. In the first O site, O(2) is bonded in a bent 150 degrees geometry to one Er(1) and one N(2) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one Er(1) and one N(1) atom. Linkers: 32 [O-][n+]1cc[n+]([O-])cc1. Metal clusters: 8 [O].[O].[O][Er]([O])([O])([O])([O])[O]. RCSR code: bcu. The MOF has largest included sphere 4.23 A, density 1.58 g/cm3, surface area 3178.65 m2/g, accessible volume 0.23 cm3/g