Intermolecular Communication in a Supramolecular Assembly of Porphyrins and Phthalocyanines
In this paper, we will present construction of the suplamolecular arrays of a metallo-porphyrin and a metallo-phthalocyanine through four-fold rotaxane formation between a tetradactyl porphyrin with alkylammmonium moieties and a phthalocyanine bearing four crown ethers (Figure 1a) and significant electronic communications between the metal complexes (Figure 1b). Since synthetic strategy for the rotaxane is applicable to pre- and post-metallation of both porphyrin and phthalocyanine centers, the four-fold rotaxane framework is suitable for homo- and hetero-assemblage of metal ions. In a homo-dinuclear Cu2+ complex of the four-fold rotaxane, the Cu2+-porphyrin and the Cu2+-phthalocyanine showed a switching behavior in the spin–spin interaction through change of the spatial distance between the two metal centers induced by protonation and deprotonation.
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