NiII1,4,8,11-tetraazacyclotetradecane electrocatalytic films prepared on top of surface anchored PAMAM dendrimer layers. A new type of electrocatalytic material for the electrochemical oxidation of methanol.
Gold electrodes, previously prepared with surface anchored PAMAM dendrimers, were further modified with a Ni-containing tetraazamacrocycle resulting in a novel electrocatalytic material which proved to be particularly efficient for the electrochemical oxidation of methanol in basic aqueous medium.
Electropolymerized nickel macrocyclic complex-based films: design and electrocatalytic application
The voltammetric behaviour of electropolymerized nickel macrocyclic 
complexes in alkaline aqueous solution is described. The nickel-based 
modified electrodes were prepared by oxidative polymerization of nickel 
porphyrin, nickel salen and nickel cyclam complexes by repeated potential 
scans in 0.1 m NaOH solution. All the electroformed films exhibited the 
same behaviour which is similar to that shown by nickel hydroxide-modified 
electrodes. In addition, the nickel complex-based polymers act as 
efficient materials for the electrocatalytic oxidation of methanol, 
ethanol and hydrazine.
Electrochemistry of conducting polypyrrole films containing cobalt porphyrin
The electrochemical polymerisation of pyrrole-substituted cobalt tetraphenylporphine complex on a vitreous carbon electrode has been performed in acetonitrile+tetrabutylammonium tetrafluoroborate solution. The redox properties of the film have been examined by cyclic voltammetry and compared to those of cobalt-porphyrin monomer in solution. Voltammograms of these films exhibit a reversible process for the Co(II)/Co(I) reaction at a formal potential of −0.87 V/SCE. The cobalt-porphyrin content of the films has been estimated by cyclic voltammetry, and the conductivity of the polymers has been assessed by studying well-known electrochemical processes in solution at these modified electrodes. Thus, it appears that thick polyporphyrin films act as insulators in low potential range E < −1 V/SCE. Copolymerisation of the pyrrole-substituted cobalt porphyrin with pyrrole and 3-(pyrrol-1-ylmethyl)pyridine has been achieved. No improvement of the electrochemical properties has been noted for the copolymers obtained. We have also proved that interchain complexation reaction of the cobalt(III) sites occurs by the pyridine moieties of the copolymer films.