Excited state structural dynamics of the charge transfer state of peridinin

Aaron J. Van Tassle, Matthew A. Prantil, Roger G. Hiller, Graham R. Fleming*

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We present infrared and visible transient absorption measurements of the first excited singlet state (S1 and S1/ICT) of peridinin in methanol, isopropanol, and chloroform solution following one-photon excitation, using 490 nm light, to excite the S2 state that populates S1 via rapid (∼50 fs in methanol) internal conversion. This technique enables the study of subsequent structural dynamics in S1 involved in the formation of the charge transfer state. The S1 lifetime of peridinin in methanol, isopropanol, and chloroform is found to be 12, 54, and 65 ps, respectively, as determined by infrared transient absorption. We observe two formation timescales in the S1 state. We attribute the shortest timescale to relaxation following internal conversion and the longer timescale to formation of the S1/ICT state.

Original languageEnglish
Pages (from-to)17-24
Number of pages8
JournalIsrael Journal of Chemistry
Volume47
Issue number1
DOIs
Publication statusPublished - 2007

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