(Mn(HCOO)2)3C4H4O crystallizes in the monoclinic P2_1/c space group. The structure consists of four furan molecules inside a Mn(HCOO)2 framework. In the Mn(HCOO)2 framework, there are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(3), one O(5), one O(7), and one O(9) atom to form a mixture of edge and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 68-71°. The Mn(1)-O(1) bond length is 2.21 Å. The Mn(1)-O(11) bond length is 2.15 Å. The Mn(1)-O(3) bond length is 2.21 Å. The Mn(1)-O(5) bond length is 2.19 Å. The Mn(1)-O(7) bond length is 2.18 Å. The Mn(1)-O(9) bond length is 2.14 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(12), one O(2), one O(3), one O(5), and one O(7) atom to form edge-sharing MnO6 octahedra. The Mn(2)-O(1) bond length is 2.23 Å. The Mn(2)-O(12) bond length is 2.11 Å. The Mn(2)-O(2) bond length is 2.11 Å. The Mn(2)-O(3) bond length is 2.17 Å. The Mn(2)-O(5) bond length is 2.19 Å. The Mn(2)-O(7) bond length is 2.24 Å. In the third Mn site, Mn(3) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(9) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 68°. Both Mn(3)-O(4) bond lengths are 2.18 Å. Both Mn(3)-O(6) bond lengths are 2.16 Å. Both Mn(3)-O(9) bond lengths are 2.21 Å. In the fourth Mn site, Mn(4) is bonded to two equivalent O(10), two equivalent O(11), and two equivalent O(8) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 71°. Both Mn(4)-O(10) bond lengths are 2.16 Å. Both Mn(4)-O(11) bond lengths are 2.22 Å. Both Mn(4)-O(8) bond lengths are 2.16 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 1.28 Å. The C(1)-O(2) bond length is 1.26 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 1.11 Å. The C(2)-O(3) bond length is 1.29 Å. The C(2)-O(4) bond length is 1.25 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 1.11 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 1.10 Å. The C(5)-O(10) bond length is 1.25 Å. The C(5)-O(9) bond length is 1.29 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 1.10 Å. The C(6)-O(11) bond length is 1.29 Å. The C(6)-O(12) bond length is 1.26 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(10) is bonded in a distorted bent 150 degrees geometry to one Mn(4) and one C(5) atom. In the second O site, O(11) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(4), and one C(6) atom. In the third O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Mn(2) and one C(6) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one C(1) atom. In the fifth O site, O(2) is bonded in a bent 120 degrees geometry to one Mn(2) and one C(1) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one C(2) atom. In the seventh O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Mn(3) and one C(2) atom. In the eighth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one C(3) atom. In the ninth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Mn(3) and one C(3) atom. In the tenth O site, O(7) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one C(4) atom. In the eleventh O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Mn(4) and one C(4) atom. In the twelfth O site, O(9) is bonded in a trigonal planar geometry to one Mn(1), one Mn(3), and one C(5) atom. Linkers: 24 [O]C=O. Metal clusters: 12 [Mn]. The MOF has largest included sphere 2.03 A, density 1.94 g/cm3, surface area 3468.33 m2/g, accessible volume 0.15 cm3/g