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The gas-phase equilibrium reaction between fluorobenzene and chlorobenzene and their conjugate bases was studied by Fourier transform ion cyclotron resonance spectrometry in order to reconcile conflicting experimental results obtained using different techniques. The results of a large number of measurements yield equilibrium constants which show chlorobenzene to be more acidic than fluorobenzene by 0.55±0.15 kcal mol-1 (ΔG° at 330 K). Different control experiments were carried out to ensure that the measured equilibrium constants reflect adequately the thermal distribution of the different isomeric halophenide ions.
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Andrade et al. (1996) studied this question.
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