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Kinetics of Porphyrin Metalation Reactions in Micellar Media. Singlet Emission Studies

Rao, Hanumantha V and Krishnan, V (1985) Kinetics of Porphyrin Metalation Reactions in Micellar Media. Singlet Emission Studies. In: Inorganic Chemistry, 24 (22). pp. 3538-3541.

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Abstract

The kinetics of $Cu^{2+}$, $Zn^{2+}$, and $Cd^{2+}$ incorporation eactions into meso-tetraphenylporphyrin $(H_2TPP)$ have been studied in neutral and anionic surfactant media. Fluorescence pectroscopy employed in these investigations revealed many advantages in deriving the kinetic data. A general kinetic scheme is proposed that takes into account implicitly the influence of surfactant concentration and interphase effects on the rates of metal incorporation reactions. The enhancement of rates of rphyrin metalation reaction in micellar media relative to those found in homogeneous media is interpreted in terms of distribution of metal ions in the stern region of the icellar media. The relative rates of metal incorporation reactions in SDS micelles for different metal ions are found to follow the order $Cu^{2+} > Zn^{2+} > Cd^{2+}$. On the basis of the magnitude of protonation constant $(pK_3)$ of $H_2TPP$ in SDS micelles, a mechanism similar to that proposed in homogeneous media is advanced for the metal incorporation reaction in the micellar media.

Item Type: Journal Article
Additional Information: Copyright of this article beolngs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 25 Jul 2008
Last Modified: 19 Sep 2010 04:47
URI: http://eprints.iisc.ernet.in/id/eprint/15041

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