Photoinduced electron transfer process probed by persistent spectral hole burning spectroscopy. The effect of the acceptor on non-photochemical hole burning

We studied the photoinduced electron transfer process at low temperatures by suing persistent spectral hole burning spectroscopy. The efficiency of non-photochemical hole burning for zinc tetraphenylporphine (ZnTPP) and zinc phthalocyanine decreased in the presence of electron acceptors. This is attributed to fast electron transfer and charge recombination reactions. The rate constant of the electron transfer from ZnTPP to the naphthoquinone group which is linked with ZnTPP via a methylene chain (n = 6) at 4.2 K was estimated to be 9.4 × 1010 s−1.