Abstract
Abstract The first amphiphilic cobalt (III) and copper phthalocyanines (V) have been prepared and are characterized by UV-absorption and magnetic circular dichroism (MCD) spectra in water and organic solvents and in their mixtures. These phthalocyanines exist as dimers in water and as monomers in some organic solvents. Monomer–dimer equilibrium was affected by solvent polarity (or hydrophobicity); with lower cosolvent polarity favoring formation of monomers. Cyclic voltammetry suggests that III adsorbed onto glassy carbon (GC) from an aqueous or acetonitrile (AN) solution in monomeric, irrespective of its state in solution. The CoII/I redox potential of III shifts anodically by adsorption onto GC, and this shift is larger when adsorbed from an AN solution than from an aqueous solution. Electroreduction of oxygen occurs at more positive potential at III-adsorbed GC in plain solution than at bare GC in III-dissolved solution.
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