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Effect of stannous octoate on the thermal decomposition of 2,2?-azobis(isobutyronitrile)

โœ Scribed by Tabka, Mohamed Tahar; Chenal, Jean-Marc; Widmaier, Jean-Michel

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
101 KB
Volume
49
Category
Article
ISSN
0959-8103

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โœฆ Synopsis

The thermal decomposition rate constant k d of 2,2'-azobis(isobutyronitrile) (AIBN) in ethyl acetate was determined at 60 ยฐC in the presence of various amounts of stannous octoate (SnOc 2 ). The k d values were found to be dependent on the concentration of SnOc 2 in the solution. This dependence is not a linear function of the concentration because k d goes through a maximum when [SnOc 2 ]/ [AIBN] = 1. These features were explained by assuming the formation of a 1:1 cyclic complex between the nitrile groups of AIBN and the tin atom of SnOc 2 . This complex induces steric constraints in the azo bond of AIBN, thus increasing its rate of decomposition.

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