Kinetics of the Formation of Metalloporphyrins and the Catalytic Effect of Lead Ions and Hydrogen Ions 


Vol. 35,  No. 11, pp. 3313-3318, Nov.  2014
10.5012/bkcs.2014.35.11.3313


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  Abstract

The reaction mechanism of Lead ions catalyzing complexation reactions between TIPP and metal ions was investigated by researching the kinetics of the formation of metalloporphyrins by UV/Vis-spectra, and verified by exploring the formation of metalloporphyrins catalyzed by acetic acid. Kinetics studies suggested that the fluctuations of reaction rate indicated the formation of metalloporphyrin was step-wise, including the preequilibrium step (the coordination of the pyrrolenine nitrogens to Mn+) and the rate-controlling step (the deprotonation of the pyrrole proton). In the pre-equalization step, a sitting-atop (SAT) structure formed first with the complexation between larger radius of Pb2+ and TIPP, changed the activation, then Pb2+ left with the smaller radius of metal ions attacking from the back of the porphyrin ring center. In the rate-controlling step, two pyrrole protons dissociated to restore a stable structure. This was verified by adding acetic acid at different reaction times.

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  Cite this article

[IEEE Style]

Y. Qi and J. G. Pan, "Kinetics of the Formation of Metalloporphyrins and the Catalytic Effect of Lead Ions and Hydrogen Ions," Bulletin of the Korean Chemical Society, vol. 35, no. 11, pp. 3313-3318, 2014. DOI: 10.5012/bkcs.2014.35.11.3313.

[ACM Style]

Yong Qi and Ji Gang Pan. 2014. Kinetics of the Formation of Metalloporphyrins and the Catalytic Effect of Lead Ions and Hydrogen Ions. Bulletin of the Korean Chemical Society, 35, 11, (2014), 3313-3318. DOI: 10.5012/bkcs.2014.35.11.3313.

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ISSN(Print) 0253-2964
ISSN(Online) 1229-5949