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Synthesis, electrochemical and spectroelectrochemical studies of octaphenylthio-substituted phthalocyanines

Fungisai Matemadombo

Rhodes University Department of Chemistry, PO Box 94, Grahamstown 6140, South Africa

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M. David Maree

Rhodes University Department of Chemistry, PO Box 94, Grahamstown 6140, South Africa

SPP full member in good standing

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Kenneth I. Ozoemena

Rhodes University Department of Chemistry, PO Box 94, Grahamstown 6140, South Africa

SPP full member in good standing

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Philippe Westbroek

Ghent University, Department of Textiles, Technologiepark 907, B-9052 Gent, Belgium

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, and

Tebello Nyokong

Rhodes University Department of Chemistry, PO Box 94, Grahamstown 6140, South Africa

Corresponding author, fax: +27(0) 622 5109

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https://doi.org/10.1142/S1088424605000605Cited by:33 (Source: Crossref)

Abstract

Cobalt (4) and iron (5) phenylthio-substituted phthalocyanines (MPc(SR)₈) have been synthesized and characterized. Cyclic square wave voltammetry in dimethylformamide containing tetrabutylammonium perchlorate revealed five and six redox processes, respectively, for complexes 4 and 5. The complexes are easier to reduce compared to the corresponding unsubstituted MPc and to butylthio substituted derivatives. The first oxidation and reduction occurs on the metal for both complexes. Spectroelectrochemistry (in dimethylformamide containing tetrabutylammonium perchlorate) was employed to assign the cyclic voltammetry peaks, and gave spectra characteristic of Fe^IPc for reduction of 5 and Co^IPc for the reduction of 4. The spectrum of the former is particularly of importance since such species have not received much attention in the literature.

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