HCO2Li crystallizes in the monoclinic C2/c space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form a mixture of edge and corner-sharing LiO4 tetrahedra. The Li(1)-O(1) bond length is 1.95 Å. The Li(1)-O(3) bond length is 1.95 Å. The Li(1)-O(4) bond length is 1.95 Å. The Li(1)-O(8) bond length is 1.97 Å. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form a mixture of edge and corner-sharing LiO4 tetrahedra. The Li(2)-O(1) bond length is 1.95 Å. The Li(2)-O(2) bond length is 1.94 Å. The Li(2)-O(3) bond length is 1.97 Å. The Li(2)-O(4) bond length is 1.94 Å. In the third Li site, Li(3) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form a mixture of edge and corner-sharing LiO4 tetrahedra. The Li(3)-O(2) bond length is 1.96 Å. The Li(3)-O(5) bond length is 1.95 Å. The Li(3)-O(6) bond length is 1.97 Å. The Li(3)-O(7) bond length is 1.94 Å. In the fourth Li site, Li(4) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form a mixture of edge and corner-sharing LiO4 tetrahedra. The Li(4)-O(5) bond length is 1.98 Å. The Li(4)-O(6) bond length is 1.97 Å. The Li(4)-O(7) bond length is 1.96 Å. The Li(4)-O(8) bond length is 1.95 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one H(1), one O(1), and one O(2) atom. The C(1)-H(1) bond length is 1.11 Å. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.27 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one H(2), one O(4), and one O(7) atom. The C(2)-H(2) bond length is 1.11 Å. The C(2)-O(4) bond length is 1.27 Å. The C(2)-O(7) bond length is 1.26 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one H(3), one O(3), and one O(6) atom. The C(3)-H(3) bond length is 1.11 Å. The C(3)-O(3) bond length is 1.26 Å. The C(3)-O(6) bond length is 1.27 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one H(4), one O(5), and one O(8) atom. The C(4)-H(4) bond length is 1.11 Å. The C(4)-O(5) bond length is 1.26 Å. The C(4)-O(8) bond length is 1.27 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 eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Li(1), one Li(2), and one C(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(2), one Li(3), and one C(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Li(1), one Li(2), and one C(3) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(1), one Li(2), and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Li(3), one Li(4), and one C(4) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Li(3), one Li(4), and one C(3) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Li(3), one Li(4), and one C(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Li(1), one Li(4), and one C(4) atom. Linkers: 16 [O]C=O. Metal clusters: 16 [Li]. The MOF has largest included sphere 2.57 A, density 1.43 g/cm3, surface area 4258.90 m2/g, accessible volume 0.15 cm3/g