Pillared Porphyrin Homologous Series: Intergrowth in Metal−Organic Frameworks

We report three new porphyrin-based, pillared paddle-wheel homologous series: porphyrin paddle-wheel frameworks PPF-3, -4, and -5. These compounds are assembled from free base or palladium tetrakis(4-carboxyphenyl)porphine, M(NO3)2 (M = Co and Zn), and 4,4′-bipyridine via solvothermal reactions. The resulting solids exhibit 3D metal−organic frameworks, where 2D layers are pillared by bipyridine with three different packing arrangements.