Applications of the channel flow cell for UV‐visible spectroelectrochemical studies. Part 2: Transient signals

Abstract

AbstractThe use of the channel flow cell for ultraviolet‐visible (UV‐vis) spectroelectrochemical experiments has been developed to determine the diffusion coefficients of electrogenerated species by means of monitoring the transient absorbance response resulting from a potential step at a working electrode immediately upstream of the incident spectrophotometric beam. The technique is applied to measure the diffusion coefficient of tris(4‐bromophenyl)amine (TBPA) radical cation in acetonitrile at 25°C. It is shown that the diffusion coefficient of electrogenerated TBPA radical cation (1.64 ± 0.02 × 10−5 cm2 s−1) is very close to that of the parent molecule (1.57 ± 0.03 × 10−5 cm2 s−1).