Photoinduced charge transfer along a meso,meso-linked porphyrin array

Electroabsorption spectra of meso,meso-linked zinc porphyrin arrays doped in a PMMA polymer film have been measured with a field modulation spectroscopy, and the change in electric dipole moment (Delta mu) and in molecular polarizability has been evaluated for the transition into each of the exciton splitting components of the Soret band. Delta mu following photoexcitation is non-zero in the oligomers, and the magnitude becomes larger with the increasing number of linked molecules, suggesting that photoinduced charge transfer occurs along the linked porphyrin array.