Pulse radiolysis of chlorophyll a in solution

Niels Henrik Jensen

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    Abstract

    Pulse radiolysis of chlorophyll a (Chi a) in pure tetrahydrofuran (THF) and in tetrahydrofuran + 2% triethylamin (TEA) gives rise to a transient electronic absorption band with a maximum at 455 nm. The lifetime and chemistry of this transient strongly depend upon the presence of triethylamin. In pure tetrahydrofuran the transient undergoes a fast second-order decay with a typical half-life of ∼ 8 us, and an apparent second-order rate constant 2 k = 1.5 • 1010 M-1 s-1 is determined. The initial spectrum is replaced by a long-lived residual
    absorption with maxima at 465 and 480 nm. In tetrahydrofuran + 2% triethylamin the typical half-life is 400 us, and the products show absorptions at 470 and 520 nm. These results are discussed and the 455 nm transient is tentatively assigned to the radicalanion of Chi a, while the 520 nm product is
    assigned to β/δ-dihydrochlorophyll a (Krasnovsky's pigment).
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherRisø National Laboratory
    Number of pages21
    ISBN (Print)87-550-0447-4
    Publication statusPublished - 1977
    SeriesRisø-M
    Number1914
    ISSN0418-6435

    Keywords

    • Risø-M-1914

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