Intramolecular transfer processes in a covalently linked zinc porphyrin-zinc phthalocyanine heterodimer are investigated as a function of the solvent polarity. In toluol, selective excitation of the porphyrin chromophore is followed by a very efficient energy-transfer process to the phthalocyanine moiety. This reaction takes place in both the singlet and triplet porphyrin excited states in competition with the other radiative and nonradiative decay pathways. In contrast to this phenomenon, a charge-transfer reaction occurs in dimethyl sulfoxide. The difference of behavior has been explained in terms of conformational change due to the nature of solvent interaction.
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