Abstract
Gamma-induced intermediates stabilized in “kriptofix-21”, “kriptofix-22”, “kriptand-222” and 18-ane-S6 have been studied by ESR spectroscopy at 77–300 K. Apparently, radicals with H-atom abstraction from methylene group are the main paramagnetic products in diazocrown ethers while formation of both cyclic and uncyclic species is observed in 18-ane-S6 at 77 K. Heating γ-irradiated thiacrown ether up to room temperature mainly results in the cleavage of macrocyclic C−S following by stabilization of uncyclic radicals. 18-ane-S6 has a higher radiation resistance by comparison with oxygen- and aza-containing crown ethers at low temperature γ-radiolysis.
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