Published May 2000
| Version v1
Journal article
Analysis of EPR spectra of -CF2CFCF2- macroradical stabilized at 77 K in matrix of γ-irradiated polytetrafluoroethylene
- 1. RAN, Inst. Problem Khimicheskoj Fiziki, Chernogolovka (Russian Federation)
Description
For -CF2CFCF2- macroradicals in γ-irradiated polytetrafluoroethylene non equivalence of fluorine β-atoms resulting in doublet-triplet-triplet form of EPR spectra at 77 K is established. Conformation angle between axis of unpaired electron orbit and projection of Cβ-Cγ-bond is 60 Deg. Constants of superfine interaction on fluorine α- and β-atoms are determined. Constants of superfine splitting on two equivalent fluorine β-atoms are 7.2 mT. Value of this constant on the two rest equivalent fluorine β-atoms is 1.8 mT. Value of superfine splitting on fluorine α-atom is 23.8 mT
Abstract (Russian)
Для макрорадикалов -CF2CFCF2- в γ-облученном политетрафторэтилене установлена неэквивалентность β-атомов фтора, приводящяя к дублет-триплет-триплетной форме спектров ЭПР при 77 К. Конформационный угол между осью орбиты неспаренного электрона и проекцией Cβ-Cγ-связи составляет 60 град. Определены константы сверхтонкого взаимодействия на α- и β-атомах фтора. Константы сверхтонкого расщепления на двух эквивалентных β-атомах фтора равны 7.2 мТл. Значение этой константы на двух остальных эквивалентных β-атомах фтора составляет 1.8 мТл. Величина сверхтонкого расщепления на α-атомах фтора равнв 23.8 мТлAdditional details
Additional titles
- Original title (Russian)
- Анализ спектров EhPR макрорадикала -CF
Publishing Information
- Journal Title
- Khimiya Vysokikh Ehnergij
- Journal Volume
- 34
- Journal Issue
- 3
- Journal Page Range
- p. 177-180
- ISSN
- 0023-1193
- CODEN
- KHVKAO
INIS
- Country of Publication
- Russian Federation
- Country of Input or Organization
- Russian Federation
- INIS RN
- 31035185
- Subject category
- S38: RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY;
- Descriptors DEI
- BOND ANGLE; CHEMICAL BONDS; CHEMICAL RADIATION EFFECTS; ELECTRON SPIN RESONANCE; ENERGY LEVELS; GAMMA RADIATION; RADICALS; SPECTRA; TEFLON; TEMPERATURE RANGE 0065-0273 K
- Descriptors DEC
- ELECTROMAGNETIC RADIATION; FLUORINATED ALIPHATIC HYDROCARBONS; HALOGENATED ALIPHATIC HYDROCARBONS; IONIZING RADIATIONS; MAGNETIC RESONANCE; MATERIALS; ORGANIC COMPOUNDS; ORGANIC FLUORINE COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; ORGANIC POLYMERS; PETROCHEMICALS; PETROLEUM PRODUCTS; PLASTICS; POLYETHYLENES; POLYMERS; POLYOLEFINS; POLYTETRAFLUOROETHYLENE; RADIATION EFFECTS; RADIATIONS; RESONANCE; SYNTHETIC MATERIALS; TEMPERATURE RANGE
Optional Information
- Notes
- 15 refs., 3 figs.