PERCHLORINATED PHTHALOCYANINES - SPECTROSCOPIC PROPERTIES AND SURFACE ELECTROCHEMISTRY

The electronic spectroscopic data for zinc, cobalt, and iron perchlorinated phthalocyanines in several oxidation states are discussed. The magnetic properties of the iron(II) and cobalt(II) derivatives from ambient temperature to 5 K are reported. The electrochemical behavior of these three species is reported in solution and as surfaces on highly oriented pyrolytic graphite. The pH dependence of the surface data is analyzed in detail. The first clearly defined reduction process corresponds with MI[Cl16PC(-2)]-/MI[CL16PC(-3)]2-for M = Co and Fe. The iron and cobalt species' MIIPc(-2)/[MIPc(-2)]-redox process are broad or ill-defined on the surface and absent from solution. The FeIII[Cl16Pc(-2)]+/FeII,[Cl16Pc(-2)] redox process has atypical pH dependence. The data are explained in terms of the acceptor nature of the chlorine substitution. Oxygen reduction data, catalyzed by these species, are also reported. © 1990, American Chemical Society. All rights reserved.