Influence of polyether ring size and of the nature of substituents on the yields of paramagnetic centers in γ-irradiated mono-and dibenzosubstituted crown ethers at 77 K |
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Authors: | S. V. Nesterov O. Yu. Panov |
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Affiliation: | (1) Karpov Institute of Physical Chemistry, ul. Vorontsovo Pole, 10, 103064 Moscow, Russia |
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Abstract: | Intermediates stabilized in γ-irradiated mono-and dibenzosubstituted crown ethers are studied by ESR spectroscopy at 77 K. PhO radicals and radicals with H-atom abstraction from polyether ring are the main products at low temperature γ-radiolysis. The nature of radicals produced in radiolysis and the yield of radicals,G R depend on macroring size and on the number of aromatic substiuents. Negative deviation from additive in function ofG R versus ε of substituents is an evidence of efficient transfer of adsorbed energy to the π-system of aromatic group. |
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