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Synthesis and electrochemical behavior of novel peripherally and non-peripherally substituted ball-type cobalt phthalocyanine complexes
Authors:Mevlü  de Canl?caIrvin Noel Booysen,Tebello Nyokong
Affiliation:a Yildiz Technical University, Chemistry Department, Inorganic Chemistry Division, Davutpasa Campus, 34220 Esenler, Istanbul, Turkey
b Rhodes University, Chemistry Department, P.O. Box 6140, Grahamstown, South Africa
Abstract:The syntheses of new ball-type Co(II) phthalocyanines containing 4,4′-(9H-fluorene-9,9-diyl)diphenol substituents at non-peripheral (complex 6) and peripheral (complex 7) positions are presented. These complexes were characterized by UV-Vis, FT-IR, mass spectroscopy and electrochemical methods. Both complexes exhibit metal and ring based redox processes, typical of cobalt phthalocyanine complexes. For 6, the metal based reduction was observed at −0.46 V followed by a ring based reduction at −1.40 V. The metal oxidation for 6 was observed at +0.16 V and the ring based oxidation at +1.05 V. For 7, reductions are easier but the oxidations are more difficult. The metal based reduction for 7 was observed at −0.38 V followed by a ring based reduction at −1.03 V. The metal oxidation for 7 was observed at +0.20 V and the ring based oxidation at +1.35 V.
Keywords:Cobalt phthalocyanine   Ball-type phthalocyanines   Cyclic voltammetry   Spectroelectrochemistry
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