Catalysis by acids, bases and metal ions - The rate of proton transfer
5 important questions on Catalysis by acids, bases and metal ions - The rate of proton transfer
In what three steps can the mechanism of proton transfer be divided?
1. The diffusion-controlled formation of a hydrogen bond between B- and HA.
2. The transfer of the proton.
3. The diffusion-controlled dissociation of the product.
With what type of compounds is proton transfer faster and with what type slower?
Proton transfer between electronegative elements like O, N, S and halogens is very rapid. Proton transfer between carbons is usually slower.
Which step is rate determining in proton transfer?
The formation of the hydrogen bond between proton donor and proton acceptor is rate determining.
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Why is diffusion-controlled formation of the hydrogen bond in water much faster than diffusion of other ions?
Other ions than H+ have to travel the whole way where in water the proton diffusion occurs trough hydrogen bonds.
How fast are diffusion-controlled reactions?
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