Abstract
The electrochemistry and spectroelectrochemistry of In(III) tetraphenyl- and octaethylporphyrins were investigated in nonaqueous media. Counterions on the In(III) complexes were either Cl/sup -/ or ClO/sub 4//sup -/. Each oxidized and reduced species was characterized by UV-visible spectroscopy, and ESR spectra were obtained for each of the generated cation and anion radicals. Singly oxidized species gave rise to ESR spectra with values of g approx. = 2.00 but with values of ..delta..H that varied between 16.8 and 221 G depending upon the nature of the porphyrin ring and the composition of the solvent-supporting electrolyte systems. Analysis of the ESR data indicated ..pi..-ring-centered reactions with a small amount of spin density residing upon the metal. 23 references, 6 figures, 5 tables.
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