Kinetic characteristics of the photoreduction of benzophenone in solid polymers in the presence of 4-halophenols

Autor:	Peter P. Levin, N. B. Sul’timova, A. V. Kutsenova
Rok vydání:	2010
Předmět:	chemistry.chemical_classification Ketone Photodissociation Polymer Photochemistry Hydrogen atom abstraction Condensed Matter::Soft Condensed Matter chemistry.chemical_compound Reaction rate constant chemistry Benzophenone Molecule Physical and Theoretical Chemistry Triplet state
Zdroj:	Russian Journal of Physical Chemistry B. 4:834-838
ISSN:	1990-7923 1990-7931
DOI:	10.1134/s1990793110050210
Popis:	Benzophenone photoreduction in the presence of 4-halophenols (RC6H4OH; R = Cl, Br, and I) in a polymer glass is studied in terms of steady-state and nanosecond laser photolysis. The experimental data on the kinetics of the decay of the ketone triplet state are treated using a polychronous kinetic model in the assumption that two concurrent processes (hydrogen atom abstraction from the polymer and from the phenol) occur. The proton transfer rate constants averaged over the distribution and the parameter n that characterizes the distribution width were determined. The value of k av for the halophenols is shown to be more than an order of magnitude higher. No heavy atom effect is observed. The reaction product composition is demonstrated to change upon addition of a halophenol. The photoreduction in glass polymers is controlled by hydrogen atom abstraction from the respective donor by triplet ketone molecules. The reaction occurs predominantly in a polymer cage, a kind of polymer nanoreactor.
Databáze:	OpenAIRE
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