KINETICS AND MECHANISM OF ELECTRON-TRANSFER REACTION OF AQUOTHALLIUM(III) AND COORDINATED THALLIUM(III) - OXIDATION OF METOL WITH THALLIUM(III) IN ACID PERCHLORATE MEDIUM

The kinetics of oxidation of metol (N-methyl-p-aminophenol) by thalliu m(III) have been studied in a perchloric acid medium. This organic com pound is employed extensively in photographic work. The stoichiometry of the reaction is represented by: C6H4(OH)NHCH3 + Tl(III) --> C6H4(O) NCH3 + Tl(I) + 2H+ The kinetics indicate the rate low: k' = Kk[metal]/ 1+ K[metal] where k' is the pseudo-first-order rate constant. The rate constants and thermodynamic parameters for the rate-limiting step hav e been evaluated.