Photoinduced intramolecular charge separation in an anthraquinone-linked all-cis 5, 10, 15, 20-meso-tetrakis (2-aminophenyl)porphyrin derivative studied by picosecond and nanosecond laser spectroscopy
- 1 January 1993
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 89 (17) , 3243-3250
- https://doi.org/10.1039/ft9938903243
Abstract
Picosecond and nanosecond laser photolyses of an acetyl-linked all-cis 5, 10, 15, 20-meso-tetrakis(2-aminophenyl) porphyrin derivative (XTAPP–Ac) in acetonitrile and N,N-dimethylacetamide at room temperature reveal that the lowest excited singlet state of XTAPP–Ac is the locally excited singlet state of the porphyrin moiety; this locally excited singlet state not only decays to the ground state (via radiative and non-radiative transitions) but also undergoes intersystem crossing to the lowest excited triplet state of XTAPP–Ac. For an anthraquinone-linked compound (XTAPP–AQ), however, it is proposed that a rapid interconversion between the locally excited singlet state (1XTAPP*–AQ) of the porphyrin moiety and the charge-separated singlet state [1(XTAPP˙+–AQ˙–) produced by electron transfer from the porphyrin to anthraquinone moieties] is reached within a delay time of ca. 10 ps, although the centre-to-centre distance between these two moieties is 8.8 Å. No effective intersystem crossing from 1(XTAPP˙+–AQ˙–) to its triplet state is observed.Keywords
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