FREE RADICAL FORMATION IN HYDROCARBON CRYSTALS BY GAMMA IRRADIATION . ELECTRON SPIIN RESONANCE SPECTRA OF SOME ALKYL RADICALS

被引：28
作者：
GILLBRO, T
KINELL, PO
LUND, A
机构：
[1] Section for Nuclear Chemistry, AB Atomenergi, Studsvik, Nyköping
[2] Swedish Research Council's Laboratory, Studsvik, Nyköping
来源：
JOURNAL OF PHYSICAL CHEMISTRY | 1969年 / 73卷 / 12期
关键词：
D O I：
10.1021/j100846a023
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Single crystals and polycrystalline samples of the n-alkanes, pentane, hexane, heptane, nonane, decane, and undecane, were prepared by a freezing technique. The crystals were irradiated at 77°K with 60Co γ rays to a dose of 3 Mrads. Electron spin resonance in the X band and Q band demonstrated that CH3-CH-CH2-R is the predominant radical species in all hydrocarbons except for undecane. The measured coupling constants found are the isotropic a1 = 25 ± 1 G (quartet), a2 = 33 ± 1 G (triplet), and the orientation dependent doublet splitting a3 = 12.5 -33 G. A complexity in the central region of the spectrum from undecane is thought to indicate the presence of additional alkyl radicals. Cleavage of the carbon chain is improbable. An irreversible decrease in line width with temperature has been explained in terms of a disappearance of the dipolar interaction between radicals some 30 Å apart. In single crystals indications of radical pair formation have been found.
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页码：4167 / &
相关论文
共 37 条
[1]  
AUSLOOS P, 1968, BERICH BUNSEN GESELL, V72, P187
[2]  
AUSLOOS P, 1968, RADIAT RES REV, V1, P75
[3]   ELECTRON SPIN RESONANCE SPECTRA OF GAMMA-IRRADIATED N-HEXADECENE-1 AND N-HEXADECANE [J].
AYSCOUGH, PB ;
WALKER, DC ;
MCCANN, AP ;
THOMSON, C .
TRANSACTIONS OF THE FARADAY SOCIETY, 1961, 57 (09) :1487-&
[4]  
AYSCOUGH PB, 1962, T FARADAY SOC, V58, P1477
[5]   CHEMICAL PREPARATION + ELECTRON SPIN RESONANCE SPECTRA OF SPECIFIC TRAPPED HYDROCARBON RADICALS [J].
BENNETT, JE ;
THOMAS, A .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1964, 280 (1380) :123-+
[6]  
FESSENDEN RW, 1963, T FARADAY SOC, V39, P2147
[7]  
FESSENDEN RW, 1960, T FARADAY SOC, V33, P935
[8]  
FISCHER H, 1965, MAGNETIC PROPERTIES, V1
[9]  
GAUMANN T, 1968, ADV CHEM SER, P441
[10]  
Gaumann T, 1968, ASPECTS HYDROCARBON
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