These two methylating agents were chosen to prove the influence of different electrochemically inert anions on the ability to form monolayers. Long-chain alkyl groups at the pyridine nitrogen could be introduced by reaction with trifluoromethanesulfonic acid esters 18 a, b. 21 According to known methods, 6'2" _22 we prepared the pyridinium salts 19a and b from 15b with 18 a, b in the presence of collidine in 42 and 71% yield, ...
