The reaction of solutions of Fe(Pyac)(3) [PyacH = 3-(4-pyridyl)2,4-pentanedione] and AgNO3 produces two types of porous mixed-metal-organic frameworks (M'MOFs). With lower AgNO3 concentrations, the product (M'MOF1) has a 2D honeycomb structure with Ag:Fe = 1:1 and pores of ca. 12 x 16 angstrom. When a higher concentration of AgNO3 is employed, however, the product (M'MOF2) has Ag:Fe = 3:2 and a porous 1 D ladder structure. A variety of nonpolar solvents serve as guests in M'MOF2: with 1,2-6H4Cl2, [AgNO3](3)[Fe(Pyac)(3)](2)(1,2-C6H4Cl2)(5.5) (M'MOF2a); with C6H5Br, [AgNO3](3)[Fe(Pyac)(3)](2)(C6H5Br)(6) (M'MOF2b). M'MOFs 2a and 2b can be interconverted by treatment with the appropriate solvent, in single-crystal-to-single-crystal transformations.