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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 881-883A Water-Soluble Iron Porphyrin as a Highly...

A Water-Soluble Iron Porphyrin as a Highly Efficient and Recyclable Catalyst for Peroxynitrite Decomposition

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Abstract:

Peroxynitrite can be highly efficient catalyzed to harmless products with a turnover frequency 34.5 s^-1by micromolar concentration of water-soluble iron porphyrin, 5, 10, 15, 20-tetrakis-(4-carboxyphenyl)-porphyrin-Fe^(III)-chloride (T(p-COOH)PPFe^(III)Cl). Then we used spectroscopic and kinetic to study its decomposition mechanism and rate in bionic environment (25 mM sodium bicarbonate). The data reveal that this catalytic reaction is a recyclable reaction. Peroxynitrite is decomposed to nitrate (NO₃^-) and nitrite (NO₂^-) through forming [oxoFe^(IV)]⁺ intermediate. Moreover, the [oxoFe^(IV)]⁺ intermediate is reduced back to the starting porphyrin. It is noted that the oxidized iron porphyrin can be reduced by the reducing agent in the solution. In addition, we also find the catalytic rate constant is higher in the presence of sodium bicarbonate than the absence of sodium bicarbonate. They are 1.26×10⁶ M^-1s^-1 and 1.17×10⁶ M^-1s^-1, respectively.

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Advanced Materials Research (Volumes 881-883)

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617-624

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https://doi.org/10.4028/www.scientific.net/AMR.881-883.617

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Online since:

January 2014

Authors:

Yun Jing Luo*, San Xian Ye, Yuan Bin She, Zhi Guo Han, Ru Gang Zhong

Keywords:

Maximum Initial Velocity, Peroxynitrite, Recyclable Catalyst, Water-Soluble Iron Porphyrin

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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