Synthesis of phenylnitroxides bridged by an sp(3)-linkage.
Silicon- and carbon-bridged phenylnitroxides were synthesized. They exhibited similar ESR profiles independent of the nature of the sp(3) bridge and the substitution mode of the phenylene units. The spectra revealed a quintet signal at room temperature, which became a broad triplet by lowering the temperature. Accumulated ESR measurements at 77 K led to the successful observation of a signal at Deltam(s) = 2, indicating that the triplet state was involved in this system.
Ohshita
Joji
J
Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan. akunai@hiroshima-u.ac.jp
Iida
Toshiyuki
T
Ohta
Nobuaki
N
Komaguchi
Kenji
K
Shiotani
Masaru
M
Kunai
Atsutaka
A