Kinetics of zinc ion incorporation in base into a centrally aprotic beta-octabrominated cationic water-soluble porphyrin and its monolithium complex
✍ Scribed by Sabrina L. Bailey; P. Hambright
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 104 KB
- Volume
- 05
- Category
- Article
- ISSN
- 1088-4246
- DOI
- 10.1002/jpp.549
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✦ Synopsis
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 × 10^5^ M ^-1^ s ^-1^ for Zn ( OH )~2~ aq , 9.9 × 10^4^ M ^-1^ s ^-1^ for [Formula: see text] and [Formula: see text] was unreactive. The Li - BrP (4)^3+^ complex had a formation constant with BrP (4)^2+^ of 1.1 × 10^3^ M ^-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+^.