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- W1990468234 abstract "Abstract The UV spectrum of the secondary transition (towards 260 nm) of the anilinium ion (ΦNH+ 3) undergoes an increase of its intensity when the acidity of the medium increases at pH < 0 further than the complete protonation of the amine species. That phenomenon has been studied in a preceding work(1)(2), showing also that, contrary to the accepted opinions in UV spectroscopy(3)(4)(5), ammonium groups may interact by a “through space” coupling with the πΦ cloud. That coupling could be described as an hyperconjugative coupling since hyperconjugation can be extended to groups whose the central atom involved in the process is not a carbon atom(6–9). Furthermore, although some spectra which have never been studied are recorded in handbooks(10), except our preceding works the UV spectroscopy of aniliniums is almost unknown. However these ions are light and very simple species; they are “basic” molecules in organic chemistry. The lack of knowledge concerning them comes from the fact that they exist only in an acid medium and that their spectra are very sensitive to the acidity, as we have precedently shown for ΦNH+ 3. We extend in the present work our observations to the species ΦNH+ 3-n (CH)3n where n is, in addition to 0: 1,2 or 3, and to Φ2NH+ 2 and Φ3NH+ whose spectra are completely unknown, in order to study the ampli-" @default.
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- W1990468234 date "1986-04-01" @default.
- W1990468234 modified "2023-09-25" @default.
- W1990468234 title "Intensity of the Secondary Transition of Several Aniliniums in an Acid Medium" @default.
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- W1990468234 doi "https://doi.org/10.1080/00387018608069237" @default.
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