The Role of Reactant Adsorption in the Electrode Reactions of Tl(2,2,2)+ Cryptate Complexes at Mercury Electrodes

The electrode reactions of several Pb(II)-macrocyclic complexes and their adsorption on mercury electrodes

“…The adsorption of these complexes on mercury electrodes as well as their electrode reactions complicated by this adsorption were studied in our recent works [15,16].…”

“…These results show that the ligand is more strongly adsorbed than the complex. Similar influence of (2,2,2) concentration on surface concentration of Tl(2,2,2) + was observed earlier [15].…”

“…Such a maximum observed for all three investigated complexes occurred at the beginning of the plateau formation of Q t À 1 -E dependencies. Its occurrence indicates that all three Pb(2,2,2) 2+ , Pb(2,2,1) 2+ and Pb(2,2) 2+ complexes are adsorbed on the mercury electrode [15,16].…”

“…As a result of experiments a linear dependence was found between the logarithm of the formal rate constant and the logarithm of the stability constants of the studied complexes, and also Tl(2,2,2) + [15,16] and Cd(2,2,2) 2+ [23], which may be represented by the equation:…”

“…We have also found that the cryptate adsorption significantly influenced the electrode process of the Tl(2,2,2) + /Tl(Hg) system [15,16]. Tafel plots obtained for this couple from voltocoulometric experiments were linear but exhibited abnormal slopes.…”