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Synthesis and Structural Characterization of Cr(III) Complex of Porphyrazine and Phthalocyanine Derivatives: Kinetic Studies of Metalation and Redox Activity

David A. Isabirye1,*, Naledi H. Seheri1 and Temitayo O. Aiyelabola2

1Department of Chemistry, North-West University, Private Bag X 2046. Mmabatho 2745, South Africa

2Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria

*Corresponding author: Tel: +27 828773428; E-mail: david.isabirye@nwu.ac.za

Abstract

Chromium(III) complexes of 2,3,7,8,12,13,17,18-octakis(propyl)porphyrazine and 2,3,9,10,16,17,23,24-octa substituted phthalocyanine were synthesized, characterized and the kinetics of metalation and redox activity studied and reported. The results obtained indicated that the rate of incorporation of Cr(III) into the central cavity of the ligands is a function of the kinetic inertness and size of the metal ion as well as the peripheral substituents of the ligand. The Cr(III) complex of 2,3,7,8,12,13,17,18-octakis(propyl)porphyrazine exhibited a metal based reduction. Hence it was concluded that the nature of the incorporated metal ions has an influence on the rate and mechanism of incorporation of the metal ion and also the redox activities of these complexes.

Keywords

Chromium(III), Complex, Porphyrazine, Phthalocyanine, Kinetics.

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