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Kinetic studies of the formation, acid-catalyzed solvolysis, and cupric ion displacement of a zinc porphyrin in aqueous solutions

โœ Scribed by S.K. Cheung; F.L. Dixon; E.B. Fleischer; D.Y. Jeter; M. Krishnamurthy

Publisher
Elsevier Science
Year
1973
Weight
696 KB
Volume
2
Category
Article
ISSN
0006-3061

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โœฆ Synopsis

The rates of zinc incorporation, zinc demetallkon, and cupric ion displacement of zinc in a water-solubie porphyrin were investigated. The tetra-sulfonated tetraphenyiporphine TPPS (see Fig. 1) n-as employed in the studies. The rate of zinc ion incorporation was equal to [k,][Zn2+] EPPS J where kr = 4.76 X 10-l 3P secl at 30ยฐC; the rate of Zn-TPPS demetalIation is equal to 4[Zn-TPPS Jm+ft where ka = 10.9 ,?I? set-l at 30%; the rate of W* replacement in Zn-TPPS is equal to k&Zn-TPPS] [Cuz+J n-here X;n, = 5-1 x 10-s M-l set-' at 30ยฐC. These rate lags are discussed in terms of the possibIe mechanisms for the reactions studied.

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