Zn(HCOO)2 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(11), one O(3), one O(4), one O(5), and one O(9) atom to form edge-sharing ZnO6 octahedra. The Zn(1)-O(1) bond length is 2.06 Å. The Zn(1)-O(11) bond length is 2.11 Å. The Zn(1)-O(3) bond length is 2.16 Å. The Zn(1)-O(4) bond length is 2.06 Å. The Zn(1)-O(5) bond length is 2.13 Å. The Zn(1)-O(9) bond length is 2.17 Å. In the second Zn site, Zn(2) is bonded to one O(11), one O(2), one O(3), one O(5), one O(7), and one O(9) atom to form a mixture of edge and corner-sharing ZnO6 octahedra. The corner-sharing octahedral tilt angles range from 66-68°. The Zn(2)-O(11) bond length is 2.12 Å. The Zn(2)-O(2) bond length is 2.08 Å. The Zn(2)-O(3) bond length is 2.14 Å. The Zn(2)-O(5) bond length is 2.16 Å. The Zn(2)-O(7) bond length is 2.05 Å. The Zn(2)-O(9) bond length is 2.13 Å. In the third Zn site, Zn(3) is bonded to two equivalent O(12), two equivalent O(6), and two equivalent O(7) atoms to form corner-sharing ZnO6 octahedra. The corner-sharing octahedral tilt angles are 66°. Both Zn(3)-O(12) bond lengths are 2.11 Å. Both Zn(3)-O(6) bond lengths are 2.09 Å. Both Zn(3)-O(7) bond lengths are 2.17 Å. In the fourth Zn site, Zn(4) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(8) atoms to form corner-sharing ZnO6 octahedra. The corner-sharing octahedral tilt angles are 68°. Both Zn(4)-O(10) bond lengths are 2.10 Å. Both Zn(4)-O(2) bond lengths are 2.15 Å. Both Zn(4)-O(8) bond lengths are 2.10 Å. There are six 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 1.10 Å. The C(1)-O(1) bond length is 1.25 Å. The C(1)-O(2) bond length is 1.29 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one H(2), one O(3), and one O(4) atom. The C(2)-H(2) bond length is 1.10 Å. The C(2)-O(3) bond length is 1.28 Å. The C(2)-O(4) 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(5), and one O(6) atom. The C(3)-H(3) bond length is 1.11 Å. The C(3)-O(5) bond length is 1.29 Å. The C(3)-O(6) bond length is 1.25 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one H(4), one O(7), and one O(8) atom. The C(4)-H(4) bond length is 1.10 Å. The C(4)-O(7) bond length is 1.29 Å. The C(4)-O(8) bond length is 1.25 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one H(5), one O(10), and one O(9) atom. The C(5)-H(5) bond length is 1.11 Å. The C(5)-O(10) bond length is 1.25 Å. The C(5)-O(9) bond length is 1.28 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one H(6), one O(11), and one O(12) atom. The C(6)-H(6) bond length is 1.11 Å. The C(6)-O(11) bond length is 1.29 Å. The C(6)-O(12) bond length is 1.25 Å. There are six 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. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(5) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(6) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Zn(2), one Zn(4), and one C(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one C(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one C(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Zn(3) and one C(3) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Zn(2), one Zn(3), and one C(4) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Zn(4) and one C(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one C(5) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Zn(4) and one C(5) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one C(6) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Zn(3) and one C(6) atom. Linkers: 24 [O]C=O. Metal clusters: 12 [Zn]. The MOF has largest included sphere 4.84 A, density 1.85 g/cm3, surface area 2882.16 m2/g, accessible volume 0.20 cm3/g