Abstract
The complexation kinetics of aquocobalamin (vitamin B 12a ) by pyridine was studied as a function of pyridine concentration, temperature, and pressure. This kinetic data equally well fit D and I d mechanisms. The pressure dependence of the rate and equilibrium constants enables the construction of an overall reaction volume profile, from which it is concluded that both the forward complex formation and reverse aquation reactions proceed according to a limiting D mechanism
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