The system Bromophenol Blue + 2,4,6-trimethylpyridine in chlorobenzene shows appreciable quantities of both hydrogen-bonded and ion-pair complex species in protomeric equilibrium; the proton-transfer within the hydrogen bond proceeds at a rate of about 105 s–1, which is much slower than has been generally supposed.
J. E. Crooks and B. H. Robinson, J. Chem. Soc. D, 1970, 979 DOI: 10.1039/C29700000979
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