Fig. 4. Spectroelectrochemical CV measurement of the reduction I and exhaustive re-oxidation II (v = −10 mV s−1) of phosphine 3a (2.50 mM) in THF/0.1 M [nBu4N][OTf] at a platinum grid electrode in a double compartment cuvette-cell. Left contoure plot: relative UV-vis spectral changes during 5 cycles of CV; middle vertical plot: time dependent relative UV-vis absorption; top left: projected relative UV-vis spectra after reduction I cycle and multiple reoxidation II cycles; top right: in situ CV; bottom right: absorption based CV.
