The kinetics of dye formation by pulse radiolysis of pararosaniline cyanide in aqueous organic solution

W.L. McLaughlin, M.M. Kosaníc, V.M. Markovíc, M.T. Nenadovíc, J. Holcman, Knud Sehested

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    Abstract

    The radiation-induced conversion of the leucocyanide of pararosaniline dye [H2N≤≥]3≡C-CN, to the highly colored salt-isomer of the dye, [H2N≤≥]2=C=≤≥=NH+2 + Cn-, in acidic aqueous solution (wavelength of maximum absorption λmax=540 nm) or polar organis soution (λmax=550 nm),  takes place in two separate processes. The first is very fast (within <50ns), and the second much slower following first-order kinetics with a rate constant that varies from 4 x 103 s-1 to ∼ 106 s-1, as the acidity or concentration of an oxidizing agent increases. In oxygen-free acidic aqueous or organic solutions (argon saturated) there is an unstable transient species (λmax=380 nm). When using O2 og N2O-saturated aqueous or organic solution, there is no intermediate absorption band at 380 nm, but the slow process of dye formation at 540 or 550 nm is still sequential to the initial fast process having somewhat faster kinetics than in Ar-saturated solution.
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherRisø National Laboratory
    Number of pages28
    ISBN (Print)87-550-0630-2
    Publication statusPublished - 1979
    SeriesRisø-M
    Number2202
    ISSN0418-6435

    Keywords

    • Absorption spectra
    • Aniline
    • Aqueous solutions
    • Chemical reaction kinetics
    • Chemical reaction yield
    • Cyanides
    • Dose rates
    • Dyes
    • Organic solvents
    • Pulsed irradiation
    • Radiolysos
    • Triphenylmethane dyes

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