Molecular assembly of manganese fluorinated mesoporphyrin monolayer on a gold electrode

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.