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- W2056549865 abstract "Direct photoexcitation of 1 : 1 aromatic EDA complexes with various N-substituted X-pyridinium cations (X = nitro, fluoro, methoxy and acetoxy) is achieved by the specific irradiation of their charge-transfer (CT) absorption bands. Time-resolved picosecond spectroscopy refers to charge-transfer activation by the identification of the aromatic cation radical as the initial transient (T1) formed in a photoinduced electron-transfer together with the X-pyridinyl radical. The homolytic fragmentation of the latter varies with the X-substituent in the order X = NO2 > F > AcO > CH3O, and the addition of X˙ to the aromatic donors leads to a series of cyclohexadienyl adducts that are identified as longer-lived transients (T2) by time-resolved (nanosecond/microsecond) spectroscopy. The phototransients T1 and T2 together account for the different types of aromatic product (resulting from ring substitution, side-chain substitution and dimerization) that are generated by steady-state CT photochemistry of the aromatic EDA complexes with X-pyridinium cations." @default.
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- W2056549865 date "1992-01-01" @default.
- W2056549865 modified "2023-09-23" @default.
- W2056549865 title "Time-resolved spectroscopy and charge-transfer photochemistry of aromatic EDA complexes with X-pyridinium cations" @default.
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- W2056549865 doi "https://doi.org/10.1039/p29920001581" @default.
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