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We have found that CoPc and 16(F)CoPc when adsorbed on graphite electrode   exhibit voltammograms in alkaline solution (0.2M NaOH) that show the typical   redox peaks attributed to the Co(II)/(I) reversible. The peak potential for   CoPc is independent of surface concentration of the catalyst. In contrast,   for 16(F)CoPc the Co(II)/(I) redox process shifts to more negative potentials   when the surface concentration of the catalyst increases. In a volcano   correlation of log (i/G)E (activity per active site) versus Co (II)/(I)   formal potential of catalyst (using several CoN4 chelates) CoPc appears in   the ascending portion (activity increases with the Co (II)/(I) redox   potential) whereas 16(F)CoPc appears in the region where activity decreases   with the redox potential. In a plot of log (i/G)E versus the Co(II)/(I)   formal potential of 16(F)CoPc the declining portion of the volcano is   reproduced for one single complex. So 16(F)CoPc at different surface   concentrations behaves as Co complexes having different redox potential in   the declining portion of the volcano plot, when the activity is normalized   for the surface concentration. This is not observed for CoPc

journal of the serbian chemical society

Unusual behaviour of perflurorinated cobalt phthalocyanine compared to unsubstituted cobalt phthalocyanine for the electrocatalytic oxidation of hydrazine. Effect of the surface concentration of the catalyst on the graphite surface