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Meso-tetrakis(3',5'-di-substituted-phenyl)porphyrins: structural, electrochemical redox and axial ligation properties

Muniappan Sankar

Department of Chemistry, Indian Institute of Technology-Madras, Chennai-600 036, India

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Puttaiah Bhyrappa

Department of Chemistry, Indian Institute of Technology-Madras, Chennai-600 036, India

Corresponding author.

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Babu Varghese

Department of Chemistry, Indian Institute of Technology-Madras, Chennai-600 036, India

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K. K. Praneeth

Department of Chemistry, Indian Institute of Technology-Madras, Chennai-600 036, India

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, and

G. Vaijayanthimala

Department of Chemistry, Indian Institute of Technology-Madras, Chennai-600 036, India

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https://doi.org/10.1142/S1088424605000514Cited by:11 (Source: Crossref)

Abstract

A family of meta octa-substituted 5,10,15,20-tetraphenylporphyrin derivatives and their metal (Cu(II) and Zn(II)) complexes were examined by electrochemical studies. These functionalized MTPPs exhibited a dramatic anodic shift (>200 mV) in their first ring redox potentials relative to the para-phenyl substituted-MTPP(X) complexes and follow a fairly linear relationship with the Hammett parameter of the substituents. The extent of Lewis acidity of the core Zn(II) center in these porphyrins was probed by axial ligation of bases of varying pK_a values. The increase in K_eq values of the electron deficient Zn(II) porphyrins are as high as an order of magnitude and increase with anodic shift of the electrochemical redox potentials of the porphyrin. A crystal structure of the Zn(II) octa(carboxyethylester phenyl)porphyrin shows six-coordination geometry with the coordination through peripheral ester groups to form a supramolecular two-dimensional layer structure while the ZnT(3',5'-DMP)P complex exhibited a five-coordinate structure.

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