Picosecond relaxation of strongly coupled porphyrin dimers

Document Type

Article

Publication Title

Journal of Physical Chemistry

Abstract

Subpicosecond time-resolved absorption studies have been carried out on several lanthanide porphyrin complexes consisting of a Ce(IV) ion sandwiched between two strongly coupled cofacial porphyrin macrocycles. Following excitation, two relaxation processes having time constants of ∼1.5 and ∼10 ps are observed. The 1.5-ps process is attributed to excited-state deactivation to the electronic ground state via a low-lying ring-to-metal charge-transfer state. Relaxation of the resultant vibrationally excited ground electronic state can account for the complex spectral dynamics observed at longer times. © 1990 American Chemical Society.

First Page

3508

Last Page

3512

DOI

10.1021/j100372a028

Publication Date

1-1-1990

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