Quantitative Rate Constants for Radical Reactions in the Nanopores of Cotton

The understanding of radical reactions in nanostructured materials is important for developing new synthetic procedures and controlling degradation reactions. To develop this area, an easy method for measuring quantitative rate constants of some radical reactions in nanostructures is required. A sim...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2002-07, Vol.124 (29), p.8532-8533
Main Authors: Hunt, Paula, Worrall, David R, Wilkinson, Frank, Batchelor, Stephen N
Format: Article
Language:English
Subjects:
Azo Compounds - chemistry
Chemistry
Coloring Agents - chemistry
Exact sciences and technology
Free radicals chemistry
Gossypium - chemistry
Kinetics
Organic chemistry
Photolysis
Reactivity and mechanisms
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Summary:The understanding of radical reactions in nanostructured materials is important for developing new synthetic procedures and controlling degradation reactions. To develop this area, an easy method for measuring quantitative rate constants of some radical reactions in nanostructures is required. A simple method for measuring the rate constant of dye bleaching, k dye, by organic radicals in such materials is introduced, involving the measurement of microsecond bleaching kinetics by diffuse reflectance spectroscopy, following laser flash creation of the radicals. Using wet and dry cotton as model substrates, we obtained k dye of 2-hydroxy-2-propyl and 1-hydroxy-1-cyclohexyl radicals with reactive red 3 and reactive orange 4 and compared them to solution-phase values. Surprisingly, the reactions in cotton follow simple liquid-phase kinetics and are diffusion-controlled. A cage effect in cotton is also found.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja0201808