Abstract The accurate measurement of redox potentials small molecules is a relatively straightforward task using electrochemical methods such as cyclic voltammetry. However, proteins, in most cases, are not amenable to the same approach due slow heterogeneous electron transfer and possibility denaturing at electrode surface. This necessitates use molecular weight mediators facilitate transfer. ...

The ferrocene-pyrylium dyad behaves as a selective redox and colorimetric chemodosimeter for CN(-) and HS(-) anions, exhibiting a clear perturbation in the redox potential of the ferrocene unit and in the absorption band, in the presence of these anions.