Spectro-Electrochemistry of Cobalt and Iron Tetrasulphonated Phthalocyanines.
YORK UNIV NORTH YORK (ONTARIO) DEPT OF CHEMISTRY
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Cobalt and iron derivatives of tetrasulphonated phthalocyanine TsPc have been studied by spectro-electrochemistry in aqueous solution at pH 2-10. For CoTsPc, two reduced species are observed yellow CoITsPc-2 - and pink C0ITsPc-32--, over the entire pH range. In acid, oxidation gives a monomeric CoIIITsPc-2 species in base, an equilibrium exists between monomeric andimeric forms of CoIIITsPc-2, whose relative concentration depends upon concentration of CoTsPc, ionic strength, pH and temperature. Reduction of FeIIITRsPC-2 solutions gives green FeIIITsPc-2and pink FeITsPc-2- over the entire pH range. Oxidation gives a product which appears to be an FeIVTsPc 2 species. Differences between the spectra of the species and in the species obtaned at different pH values, and aggregation effects are discussed with reference to the nature of axial coordination to the central metal atoms.
- Organic Chemistry
- Atomic and Molecular Physics and Spectroscopy