An ESR study of radiation-chemical transformation of 4,4'(5')-di-(tert-butylcyclohexano)-18-crown-6 and its solution in 1-octanol at 77 Kстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Paramagnetic products stabilized in both 4,4'(5')-di-(tert-butylcyclohexano)-18-crown-6 (DtBuCH18C6) and its solution in 1-octanol upon low temperature (77 K) X-rays irradiation were studied by ESR spectroscopy. Macrocyclic -O-ASH-CH(2)- radicals and acyclic O = C(H)-ASH-O- radicals were found as main radiolysis products in neat DtBuCH18C6. Fraction of acyclic radicals resulting from the macrocycle cleavage was about 50%. No radical products resulted from t-Bu and cyclohexyl fragments were observed. It was concluded that the primary events were essentially concerned with ionization of the polyether moiety. Irradiation of frozen DtBuCH18C6 solutions in 1-octanol resulted in formation of radicals both from crown ether and alcohol.