Cationic and mixed-valent forms of Fe3O(CO2)(6) trigonal prismatic clusters have been linked by ditopic links, namely, 1,4-benzene-dicarboxylate (1,4-BDC) and 1,3-benzenedicarboxylate (1,3-BDC), to produce two 3-periodic metal-organic frameworks (MOFs), [Fe3O(1,4-BDC)(3)(DMF)(3)][FeCl4]center dot(DMF)(3) (MOF-235) and Fe3O(1,3-BDC)(3)(py)(3)center dot(py)(0.5)(H2O)(1.5) (MOF-236) (DMF = N,N-dimethylformamide, py = pyridine), respectively. These MOFs exemplify a new, high-symmetry topology termed acs which we identify here as the default arrangement for linking trigonal prisms together.