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Kinetics of zinc ion incorporation in base into a centrally aprotic beta-octabrominated cationic water-soluble porphyrin and its monolithium complex

SABRINA L. BAILEY

Department of Chemistry, Howard University, Washington, DC 20059, USA

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and

P. HAMBRIGHT

Department of Chemistry, Howard University, Washington, DC 20059, USA

Corresponding author, Chemistry Department, Howard University, Washington, DC 20059, USA.

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https://doi.org/10.1002/jpp.549Cited by:3 (Source: Crossref)

Abstract

The kinetics of zinc incorporation from pH 12 to 13 into the centrally aprotic BrP(4)²⁺ form of beta-octabromo-meso-tetrakis(N-methyl-4-pyridyl)porphyrin and its monolithium complex were studied at 25.0 °C, ionic strength (I) = 0.10. The reactions were first order in porphyrin and total zinc concentrations. For BrP(4)²⁺, the specific rate constant was 5.1 × 10⁵M^-1s^-1 for Zn(OH)₂aq, 9.9 × 10⁴M^-1s^-1 for and was unreactive. The Li-BrP(4)³⁺ complex had a formation constant with BrP(4)²⁺ of 1.1 × 10³M^-1 from both kinetic and equilibrium measurements. In solutions containing both BrP(4)²⁺ and Li-BrP(4)³⁺, zinc incorporation proceeded only through BrP(4)²⁺.

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