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Electrochemical Redox Properties and Spectral Features of Supermolecular Porphyrins

Maiya, Bhaskar G and Krishnan, V (1985) Electrochemical Redox Properties and Spectral Features of Supermolecular Porphyrins. In: Inorganic Chemistry, 24 (20). pp. 3253-3257.

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meso-(Tetrakis(benzo-15-crown-5)porphyrin (TCP) and its metal (Mg(II), $V^{IV}0$, Ni(II), Cu(II), Zn(II), and Mn(II1)) derivatives form dimers on complexation with $K^+$ ions. The porphyrin ring oxidations of these dimers are found to occur at less anodic potentials relative to the oxidations of the corresponding monomers. The electrochemical redox states of these dimers in conjunction with their electronic absorption and emission features have been used to arrive at the electronic structures. Supermolecular formalism has been proposed to describe the properties of these dimers. EPR data on the oxidized dimer radical cations indicate that the unpaired electron is localized on one of the porphyrin \pi systems unlike those found in the reaction-center complex, "special pair" bacteriochlorophyll (BChl) molecules, of the bacterial photosynthetic system.

Item Type: Journal Article
Publication: Inorganic Chemistry
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 21 Jul 2008
Last Modified: 19 Sep 2010 04:47
URI: http://eprints.iisc.ac.in/id/eprint/15186

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