An efficient method for the synthesis of C–C connected phthalocyanine–porphyrin oligomers

An efficient one-step method for the synthesis of covalently linked phthalocyanine–porphyrin (Pc–Por) hetero-dyads and Pc–Por–Pc hetero-triads, connected directly through C–C bonds, is presented. The procedure utilizes a Pd-mediated Suzuki cross-coupling reaction of a Pc–boronate synthon and a halogenated porphyrin. The two chromophores are directly linked, without spacer, through the β-pyrrolic-, meso-, and para-position of the meso-phenyl group of the porphyrins. The electronic absorption spectrum of the Pc–Por–Pc triad shows red-shifted, split Q-bands reflecting energy transfer.