The Kinetics of the Interaction Between Iron(III)-Ethylenediaminetetraacetate and Peroxynitrite |
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| Authors: | Virender K Sharma Ria A Yngard Zoltan Homonnay Abhishek Dey Chun He |
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| Institution: | (1) Chemistry Department, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Fl 32901, USA;(2) Department of Nuclear Chemistry, Eotvos Lorand University, 1518 Budapest, Hungary;(3) Inorganic Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Calcutta, 700 032, India;(4) School of Environmental Science and Engineering, Sun Yat-Sen (Zhongshan) University, 510275 Guangzhou, People’s Republic of China |
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| Abstract: | The kinetics of the formation of the purple-colored species between FeIII-EDTA and peroxynitrite were studied as a function of pH (10.4–12.3) at 22°C in aqueous solutions using a stopped-flow technique.
A purple-colored species was immediately formed upon mixing, which had an absorbance maximum at 520 nm. The increase in absorbance
with time could be fit empirically by a power function with two parameters a and b. The power equation determined was absorbance = a*t
b
, where a increased linearly with pH and the concentration of peroxynitrite, while b almost remained constant with a value of ~0.25. The molar extinction coefficient ε520 nm for the colored species was determined as 13 M−1cm−1, which is much lower than ε520 nm = 520 M−1 cm−1 for the FeIII(EDTA)O2]3−, a purple species observed in the FeIII–EDTA–H2O2 system. The results of kinetics and spectral measurements of the present study are briefly discussed and compared with those
of the reaction between Fe(III)-EDTA and hydrogen peroxide. |
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