Mn(HCOO)2 crystallizes in the monoclinic P2_1 space group. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(2), one O(3), one O(5), and one O(7) atom to form edge-sharing MnO6 octahedra. The Mn(1)-O(1) bond length is 2.21 Å. The Mn(1)-O(11) bond length is 2.21 Å. The Mn(1)-O(2) bond length is 2.14 Å. The Mn(1)-O(3) bond length is 2.19 Å. The Mn(1)-O(5) bond length is 2.16 Å. The Mn(1)-O(7) bond length is 2.13 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(11), one O(3), one O(5), one O(8), and one O(9) atom to form a mixture of edge and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 66-69°. The Mn(2)-O(1) bond length is 2.21 Å. The Mn(2)-O(11) bond length is 2.19 Å. The Mn(2)-O(3) bond length is 2.19 Å. The Mn(2)-O(5) bond length is 2.20 Å. The Mn(2)-O(8) bond length is 2.17 Å. The Mn(2)-O(9) bond length is 2.14 Å. In the third Mn site, Mn(3) is bonded to one O(10), one O(12), one O(13), one O(15), one O(17), and one O(8) atom to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 68-69°. The Mn(3)-O(10) bond length is 2.15 Å. The Mn(3)-O(12) bond length is 2.14 Å. The Mn(3)-O(13) bond length is 2.21 Å. The Mn(3)-O(15) bond length is 2.19 Å. The Mn(3)-O(17) bond length is 2.17 Å. The Mn(3)-O(8) bond length is 2.21 Å. In the fourth Mn site, Mn(4) is bonded to one O(13), one O(16), one O(18), one O(19), one O(21), and one O(23) atom to form a mixture of edge and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 68°. The Mn(4)-O(13) bond length is 2.17 Å. The Mn(4)-O(16) bond length is 2.15 Å. The Mn(4)-O(18) bond length is 2.16 Å. The Mn(4)-O(19) bond length is 2.17 Å. The Mn(4)-O(21) bond length is 2.19 Å. The Mn(4)-O(23) bond length is 2.20 Å. In the fifth Mn site, Mn(5) is bonded to one O(14), one O(18), one O(19), one O(20), one O(21), and one O(23) atom to form edge-sharing MnO6 octahedra. The Mn(5)-O(14) bond length is 2.12 Å. The Mn(5)-O(18) bond length is 2.24 Å. The Mn(5)-O(19) bond length is 2.24 Å. The Mn(5)-O(20) bond length is 2.09 Å. The Mn(5)-O(21) bond length is 2.18 Å. The Mn(5)-O(23) bond length is 2.17 Å. In the sixth Mn site, Mn(6) is bonded to one O(16), one O(22), one O(24), one O(4), one O(6), and one O(9) atom to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 66-68°. The Mn(6)-O(16) bond length is 2.24 Å. The Mn(6)-O(22) bond length is 2.17 Å. The Mn(6)-O(24) bond length is 2.16 Å. The Mn(6)-O(4) bond length is 2.15 Å. The Mn(6)-O(6) bond length is 2.14 Å. The Mn(6)-O(9) bond length is 2.22 Å. There are twelve 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 0.93 Å. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.21 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 0.93 Å. The C(2)-O(3) bond length is 1.26 Å. The C(2)-O(4) bond length is 1.27 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 0.93 Å. The C(3)-O(5) bond length is 1.28 Å. The C(3)-O(6) bond length is 1.24 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 0.93 Å. The C(4)-O(7) bond length is 1.23 Å. The C(4)-O(8) bond length is 1.29 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 0.93 Å. The C(5)-O(10) bond length is 1.26 Å. The C(5)-O(9) bond length is 1.27 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 0.93 Å. The C(6)-O(11) bond length is 1.27 Å. The C(6)-O(12) bond length is 1.26 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one H(7), one O(13), and one O(14) atom. The C(7)-H(7) bond length is 0.93 Å. The C(7)-O(13) bond length is 1.25 Å. The C(7)-O(14) bond length is 1.25 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one H(8), one O(15), and one O(16) atom. The C(8)-H(8) bond length is 0.93 Å. The C(8)-O(15) bond length is 1.22 Å. The C(8)-O(16) bond length is 1.29 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one H(9), one O(17), and one O(18) atom. The C(9)-H(9) bond length is 0.93 Å. The C(9)-O(17) bond length is 1.23 Å. The C(9)-O(18) bond length is 1.27 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one H(10), one O(19), and one O(20) atom. The C(10)-H(10) bond length is 0.93 Å. The C(10)-O(19) bond length is 1.27 Å. The C(10)-O(20) bond length is 1.27 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one H(11), one O(21), and one O(22) atom. The C(11)-H(11) bond length is 0.93 Å. The C(11)-O(21) bond length is 1.30 Å. The C(11)-O(22) bond length is 1.19 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one H(12), one O(23), and one O(24) atom. The C(12)-H(12) bond length is 0.93 Å. The C(12)-O(23) bond length is 1.28 Å. The C(12)-O(24) bond length is 1.22 Å. There are twelve 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. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(7) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(8) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(9) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(10) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(11) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(12) atom. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Mn(6) and one C(2) atom. In the fifth 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 sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Mn(6) and one C(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one C(4) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Mn(2), one Mn(3), and one C(4) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Mn(2), one Mn(6), and one C(5) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Mn(3) and one C(5) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one C(6) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Mn(3) and one C(6) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Mn(3), one Mn(4), and one C(7) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Mn(5) and one C(7) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one Mn(3) and one C(8) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Mn(4), one Mn(6), and one C(8) atom. In the seventeenth O site, O(17) is bonded in a distorted bent 150 degrees geometry to one Mn(3) and one C(9) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(5), and one C(9) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(5), and one C(10) atom. In the twentieth O site, O(20) is bonded in a bent 120 degrees geometry to one Mn(5) and one C(10) atom. In the twenty-first O site, O(21) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(5), and one C(11) atom. In the twenty-second O site, O(22) is bonded in a distorted bent 150 degrees geometry to one Mn(6) and one C(11) atom. In the twenty-third O site, O(23) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(5), and one C(12) atom. In the twenty-fourth O site, O(24) is bonded in a distorted bent 120 degrees geometry to one Mn(6) and one C(12) atom. Linkers: 24 [O]C=O. Metal clusters: 12 [Mn]. The MOF has largest included sphere 4.99 A, density 1.61 g/cm3, surface area 3004.69 m2/g, accessible volume 0.25 cm3/g