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Protonated Ozone: Experimental Detection of O$_3$H$^+$ and Evaluation of the Proton Affinity of Ozone

Fulvio Cacace and Maurizio Speranza
Science
New Series, Vol. 265, No. 5169 (Jul. 8, 1994), pp. 208-209
Stable URL: http://www.jstor.org/stable/2884170
Page Count: 2
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Abstract

The elusive protonated ozone ion (O$_3$H$^+$) has been long postulated as a reactive intermediate but never experimentally observed. This ion has been detected here in mass spectrometric experiments with the use of Fourier transform ion cyclotron resonance. In these experiments, ozone (O$_3$) was protonated by strong acids—for example, H$_3^+$, KrH$^+$, XeH$^+$, and CH$_5^+$. The hitherto experimentally unknown proton affinity of O$_3$ was evaluated by a "bracketing" technique and determined to be 148 ± 3 kilocalories mole$^{-1}$ at 298 kelvin, in excellent agreement with a value determined in a recent theoretical study of the O$_3$/O$_3$H$^+$ system, which was 148 kilocalories mole$^{-1}$ at zero temperature (∼149.5 kilocalories mole$^{-1}$ at 298 kelvin).

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