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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(NO(3))(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.
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Choi et al. (2008) studied this question.
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