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  • Photoinduced Processes in D...
    Ortica, Fausto; Smimmo, Paola; Mazzucato, Ugo; Favaro, Gianna; Heynderickx, Arnault; Moustrou, Corinne; Samat, André

    Photochemistry and photobiology, 09/2006, Letnik: 82, Številka: 5
    Journal Article

    The photobehavior of five photochromic dipyrrolyl-perfluoro-cyclopentenes was studied by steady state and time-resolved absorption spectroscopy. The quantum yields of the UV-photoinduced ring-closing reaction (coloration) and the visible-stimulated cycloreversion reaction (bleaching) were measured. Kinetic and thermodynamic parameters of thermal bleaching were also determined. Nanosecond time-resolved experiments showed formation of a transient, which was not a precursor of the reaction photoproduct. This transient was tentatively assigned to a radical cation formed by direct photoionization through a short-lived triplet state. The nature of the transient species was supported by photoinduced electron transfer to electron acceptors.