caa a22 4500 475758811 CHVBK 20180406123544.0 cr unu---uuuuu 170329e20000601xx s 000 0 eng 10.1007/BF02494889 doi (NATIONALLICENCE)springer-10.1007/BF02494889 A study of alkyl radicals in the matrix of polycrystalline n -alkane γ-irradiated at 77 K [Elektronische Daten] 1. Effect of chain length on ESR spectra of γ-irradiated linear alkanes [S. Allayarov, I. Barkalov] The composition of alkyl radicals (AR) formed by γ-radiolysis (T=77 K) of polycrystallinen-alkanes with different lengths of the carbon chain (C(5), C(7), C(10), C(11), and C(18)) and their polymeric analog (polyethylene) was estimated from the ESR spectra. The ESR spectra of the irradiatedn-alkanes are superpositions of the signals from the H3CC.HCH2− and −CH2C.HCH2− radicals, whose HFS constants with α and β protons as well as the equilibrium conformation are independent of the chain length of then-alkane molecule. A dependence of the concentration of the radicals on the chain length ofn-alkane was found. The absence of the −CH2C.H2 radicals that may arise upon H atom elimination from the Me fragments of then-alkane molecules is most likely related to the transfer of excitation energy from the Me group to the neighboring methylene fragment and the transformation of the −CH2C.H2 radicals into H3CC.HCH2− radicals. With account for this, the concentrations of the AR formed were suggested to be proportional to the number of H atoms at the corresponding C atom. Kluwer Academic/Plenum Publishers, 2000 polycrystalline n -alkanes nationallicence polyethylene nationallicence γ-radiolysis nationallicence distribution of radicals nationallicence ESR spectroscopy nationallicence Allayarov S. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow Region, Russian Federation aut Barkalov I. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow Region, Russian Federation aut Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/6(2000-06-01), 1028-1031 1066-5285 49:6<1028 2000 49 11172 https://doi.org/10.1007/BF02494889 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02494889 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Allayarov S. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow Region, Russian Federation aut NATIONALLICENCE 700 1- Barkalov I. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow Region, Russian Federation aut NATIONALLICENCE 773 0- Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/6(2000-06-01), 1028-1031 1066-5285 49:6<1028 2000 49 11172 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer