Disulfide-linked manganese mesoporphyrin derivatives separated by spacer me
thylene groups (Figure 1) were synthesized and then the porphyrin derivativ
es were assembled on a gold electrode. Cyclic voltammetry (CV) of the porph
yrin monolayer on a gold electrode showed that one set of waves was clearly
visible, corresponding to the consecutive monoelectronic reduction of the
manganese porphyrin unit, depending upon the spacer methylene groups. Inter
estingly, a large positive-shift of the redox potential for the mesoporphyr
in was observed due to fluorination of the porphyrin ring.