Kinetic studies of a catalyzed metalloporphyrin formation

✍ Scribed by Adegboye O. Adeyemo; M. Krishnamurthy

• Book ID: 102445287
• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 382 KB
• Volume: 16
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550160903

✦ Synopsis

Kinetics of the incorporation of mercury(I1) ion in tetra (p-trimethylammonium-pheny1)porphine have been investigated in aqueous solution at 30.0"C and 0.2 M (NaN03) ionic strength. The reaction was found to be first order each in mercury(I1) and the porphyrin. The forward (formation) and the reverse (dissociation) rate constants were found to be 1.9 ? 0.2 x lo3 M-'s-' and 7 ? 2 x lo6 M-'s-', respectively. Kinetics of zincflI) incorporation in tetra(p-trimethylammoniumpheny1)porphine catalyzed by mercury(I1) were also investigated. This catalysis is explained in terms of steady-state formation of mono mercury(II) porphyrin followed by zinc(II) displacement of mercury(I1) ion from the porphyrin. Such a mechanism also illustrates the importance of porphyrin core deformation to metal incorporation.