653604-19-4Relevant articles and documents
Spin-spin interaction between phenoxyl radicals through σ-π system
Iida, Toshiyuki,Ohshita, Joji,Ohta, Nobuaki,Komaguchi, Kenji,Itagaki, Yoshiteru,Shiotani, Masaru,Kunai, Atsutaka
, p. 192 - 199 (2007/10/03)
Compounds having two p-phenoxyl radicals bridged by a 1,2-diphenylenedisilanylene unit in m, p- and p,p- fashions were synthesized and the intramolecular spin-spin interaction was examined by Curie plots of ESR signal intensities due to the Δ MS=±2 transition at low temperature. It was found that bridging two phenoxyl radicals at meta and para positions of the bridge led to triplet ground state or degeneracy of triplet/singlet states. In contrast, two phenoxyl radicals put at both para positions interacted in an antiferromagnetic fashion through the diphenylenedisilanylene bridge, to realize singlet ground state.