Spin–spin interaction between phenoxyl radicals through σ–π system

T Iida, J Ohshita, N Ohta, K Komaguchi, Y Itagaki…

Index: Iida, Toshiyuki; Ohshita, Joji; Ohta, Nobuaki; Komaguchi, Kenji; Itagaki, Yoshiteru; Shiotani, Masaru; Kunai, Atsutaka Journal of Organometallic Chemistry, 2003 , vol. 688, # 1-2 p. 192 - 199

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Citation Number: 6

Abstract

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 ΔMS=±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 ...