Cr2Ag3(CO2)12 crystallizes in the monoclinic C2/c space group. Cr(1) is bonded to one O(1), one O(10), one O(2), one O(5), one O(6), and one O(9) atom to form CrO6 octahedra that share  a cornercorner with one Ag(2)O6 pentagonal pyramid. The Cr(1)-O(1) bond length is 1.96 Å. The Cr(1)-O(10) bond length is 1.98 Å. The Cr(1)-O(2) bond length is 1.95 Å. The Cr(1)-O(5) bond length is 1.96 Å. The Cr(1)-O(6) bond length is 1.97 Å. The Cr(1)-O(9) bond length is 1.97 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 5-coordinate geometry to one O(10), one O(3), one O(4), one O(7), and one O(8) atom. The Ag(1)-O(10) bond length is 2.34 Å. The Ag(1)-O(3) bond length is 2.39 Å. The Ag(1)-O(4) bond length is 2.57 Å. The Ag(1)-O(7) bond length is 2.69 Å. The Ag(1)-O(8) bond length is 2.41 Å. In the second Ag site, Ag(2) is bonded to two equivalent O(1), two equivalent O(11), and two equivalent O(12) atoms to form distorted AgO6 pentagonal pyramids that share corners with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 57°. Both Ag(2)-O(1) bond lengths are 2.62 Å. Both Ag(2)-O(11) bond lengths are 2.37 Å. Both Ag(2)-O(12) bond lengths are 2.53 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(3) atom. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(3) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(4) atom. The C(2)-O(2) bond length is 1.27 Å. The C(2)-O(4) bond length is 1.23 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(7) atom. The C(3)-O(5) bond length is 1.28 Å. The C(3)-O(7) bond length is 1.25 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(8) atom. The C(4)-O(6) bond length is 1.28 Å. The C(4)-O(8) bond length is 1.24 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(9) atom. The C(5)-O(11) bond length is 1.22 Å. The C(5)-O(9) bond length is 1.29 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(12) atom. The C(6)-O(10) bond length is 1.27 Å. The C(6)-O(12) bond length is 1.23 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cr(1), one Ag(2), and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cr(1) and one C(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ag(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ag(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(1) and one C(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Cr(1) and one C(4) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Ag(1) and one C(3) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one Ag(1) and one C(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Cr(1) and one C(5) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Cr(1), one Ag(1), and one C(6) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Ag(2) and one C(5) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Ag(2) and one C(6) atom. Linkers: 12 [O]C(=O)C([O])=O. Metal clusters: 4 [Cr] ,6 [Ag]. The MOF has largest included sphere 5.48 A, density 2.09 g/cm3, surface area 2529.28 m2/g, accessible volume 0.19 cm3/g