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- W2071003321 abstract "The proton-dissociation reactions from the excited state of protonated aniline (AN) and its derivatives in aqueous solution were investigated by using a femtosecond laser combined with a time-correlated single-photon counting system. The proton-dissociation rate of protonated AN at 298 K was obtained to be 1.4 × 1010 s−1, which is the fastest of those reported so far for protonated aromatic amines. The rate decreased markedly on alkylation of the amino group, being 6.2 × 109 s−1, 3.7 × 109 s−1, 7.6 × 108 s−1, and 4.4 × 107 s−1, for N-methylaniline (NMeA), N-ethylaniline (NEtA), N,N-dimethylaniline (DMA), and N,N-diethylaniline (DEA), respectively, despite the larger exothermic enthalpy changes for the proton dissociation of alkylated compounds. The activation energies for the proton-dissociation reactions of dialkylated anilines, DMA (19 kJ mol−1) and DEA (56 kJ mol−1), were much larger than those of the other anilines, AN (11 kJ mol−1), NMeA (8 kJ mol−1), and NEtA (11 kJ mol−1), suggesting that hydrophobic hydration around the alkyl amino group and steric hindrance due to the alkyl group cause an activation barrier for the movement of proton to water." @default.
- W2071003321 created "2016-06-24" @default.
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- W2071003321 date "2002-05-31" @default.
- W2071003321 modified "2023-09-24" @default.
- W2071003321 title "Excited-state proton-dissociation of N-alkylated anilinium ions in aqueous solution studied by picosecond fluorescence measurements" @default.
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- W2071003321 doi "https://doi.org/10.1039/b111370d" @default.
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