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Kinetics and mechanism of oxidation of 1,10-phenanthroline by alkaline permanganate

✍ Scribed by Rafeek G. Panari; Abdulazizkhan L. Harihar; Sharanappa T. Nandibewoor

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 79 KB
Volume: 12
Category: Article
ISSN: 0894-3230
DOI: 10.1002/(sici)1099-1395(199904)12:4<340::aid-poc120>3.0.co;2-d

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✦ Synopsis

The kinetics of the oxidation of 1,10-phenanthroline (1,10-phen) by permanganate were investigated in alkaline medium. A first-order, fractional-order and zero-order dependence of the rate each in [MnO 4 À ], [1,10-phen] and [OH À ], respectively, was observed. The data suggest that the oxidation proceeds via the formation of a complex between 1,10-phen and MnO 4

À which decomposes in a slow step to yield the free radical of 1,10-phen, followed by a fast step to give 2,2'-bipyridy1 3,3'-dicarboxaldehyde. The reaction constants involved in the mechanism were evaluated. There was good agreement between the observed and calculated rate constants under varying conditions of the experiments. The activation parameters were calculated with respect to the slow step of the mechanism.

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