Optical Properties of Metalloporphyrin Excited States

Document Type

Article

Publication Title

Journal of the American Chemical Society

Abstract

The absorption features of 1(π, π*), 3(π, π*), 3(π, π*), and (d, d) excited states of metalloporphyrins have been closely examined between 420 and 900 nm with subpicosecond/picosecond transient absorption spectroscopy. The spectra of all of these excited states exhibit strong but not readily distinguishable absorption between the Soret- and Q-band bleachings, a region used extensively and often exclusively in transient absorption studies on porphyrins. The absorption features between 600 and 900 nm are smaller than those observed in the Soret region but have distinctive characteristics that aid in assessing the presence or absence of a particular type of transient state. We discuss the electronic origins of the prominent bands in the excited-state spectra. Our results and discussion provide fundamental information on the optical properties of metalloporphyrin excited states and a much needed framework for better interpreting the results of in vivo and in vitro transient absorption studies on these complexes. © 1989, American Chemical Society. All rights reserved.

First Page

6500

Last Page

6506

DOI

10.1021/ja00199a004

Publication Date

1-1-1989

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