Rates of proton transfer for meso-tetraphenylporphyrin in 90% dimethyl sulphoxide–water (v/v)

Abstract

The rate of ionisation of the diprotonated form of meso-tetraphenylporphyrin (BH22+)to the mono-protonated form (BH+)has been measured by a tempera-ture-jump study of the equilibration between B and BH22+ and is unusually slow.