INVESTIGATION OF THE REDOX COUPLE BENZOPHENONE BENZOPHENONE ANION-RADICAL IRE ACETONITRILE AND N,N-DIMETHYLFORMAMIDE BY ELECTROCHEMICAL ANDSPECTROELECTROCHEMICAL METHODS

Diffusion layer imaging (DLI), time-resolved spectroelectrochemical me thods and electrochemical impedance spectroscopy (EIS) were applied to determine the influence of the solvent and the supporting electrolyte on reaction parameters for the benzophenone/benzophenone radical anio n redox couple (BP/BP.-) formed at a Hg-covered Au wire in aprotic sol vents. Results are reported for the solvents acetonitrile (AN) and N,N -dimethylformamide (DMF) using two different tetraalkylammonium salts as supporting electrolytes. Heterogeneous rate constants for the elect ron transfer reaction and diffusion coefficients of the neutral BP and the radical anion BP.- obtained with the different methods are discus sed and compared.