Abstract
The electrochemical reduction of β-substituted Ni II tetraphenylporphyrin was studied in DMF at a mercury electrode in order to determine the effect of axial ligand complexation in the presence of water or pyridine. The Ni II complex which is electroreduced is either the mono or bis liganded species. In contrast no axial ligand coordination is observed for the unsubstituted Ni TPP and this is the species which is electroreduced in DMF alone. This complexation of the β-substituted species is a consequence of the enhanced metal-ring interaction and especially of the d π-π * backbonding.
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