An ESR study of dynamic biradicals of two TEMPOs bridged with –(SiMe2)n– (n=1–4) in liquid solution. Komaguchi, K.; Iida, T.; Goh, Y.; Ohshita, J.; Kunai, A.; and Shiotani, M. Chemical Physics Letters, 387(4-6):327-331, 4, 2004.
An ESR study of dynamic biradicals of two TEMPOs bridged with –(SiMe2)n– (n=1–4) in liquid solution [pdf]Paper  An ESR study of dynamic biradicals of two TEMPOs bridged with –(SiMe2)n– (n=1–4) in liquid solution [link]Website  abstract   bibtex   
Biradicals composed of two TEMPOs (2,2,6,6-tetramethylpiperidinol-oxyl) bridged with –(SiMe2)n– ðn ¼ 1–4Þ to each other were synthesized and subjected to an ESR study. A quintet spectrum of an isotropic 14N-hyperfine splitting of 21.6 MHz ðg ¼ 2:0070Þ was observed for biradical 1 ðn ¼ 1Þ and a triplet of 43.3 MHz ðg ¼ 2:0072Þ for biradical 4 ðn ¼ 4Þ in 3-methylpentane at 190 K. The Si- linkage was found to effectively enhance the spin–spin exchange interaction compared with the corresponding carbon fragments. The reversible temperature dependence of the spectra was analyzed based on a model of a modulated spin exchange interaction due to a tumbling motion. The apparent activation energies for the intramolecular dynamics were found to be 5.1–10.6 kJ mol?1 in 3-methylpentane and 2-methyltetrahydrofuran solutions.
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 title = {An ESR study of dynamic biradicals of two TEMPOs bridged with –(SiMe2)n– (n=1–4) in liquid solution},
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 year = {2004},
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 pages = {327-331},
 volume = {387},
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 month = {4},
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 abstract = {Biradicals composed of two TEMPOs (2,2,6,6-tetramethylpiperidinol-oxyl) bridged with –(SiMe2)n– ðn ¼ 1–4Þ to each other were synthesized and subjected to an ESR study. A quintet spectrum of an isotropic 14N-hyperfine splitting of 21.6 MHz ðg ¼ 2:0070Þ was observed for biradical 1 ðn ¼ 1Þ and a triplet of 43.3 MHz ðg ¼ 2:0072Þ for biradical 4 ðn ¼ 4Þ in 3-methylpentane at 190 K. The Si- linkage was found to effectively enhance the spin–spin exchange interaction compared with the corresponding carbon fragments. The reversible temperature dependence of the spectra was analyzed based on a model of a modulated spin exchange interaction due to a tumbling motion. The apparent activation energies for the intramolecular dynamics were found to be 5.1–10.6 kJ mol?1 in 3-methylpentane and 2-methyltetrahydrofuran solutions.},
 bibtype = {article},
 author = {Komaguchi, Kenji and Iida, Toshiyuki and Goh, Yumiko and Ohshita, Joji and Kunai, Atsutaka and Shiotani, Masaru},
 journal = {Chemical Physics Letters},
 number = {4-6}
}
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