作者:Toshiyuki Iida、Joji Ohshita、Nobuaki Ohta、Kenji Komaguchi、Yoshiteru Itagaki、Masaru Shiotani、Atsutaka Kunai
DOI:10.1016/j.jorganchem.2003.09.004
日期:2003.12
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
合成了以m,p和p,p方式通过1,2-二苯二甲撑亚硅烷基单元桥接的两个对苯氧基基团的化合物,并通过ΔM引起的ESR信号强度的居里图检验了分子内自旋-自旋相互作用S =±2在低温下的转变。发现在桥的间位和对位桥接两个苯氧基自由基会导致三重态基态或三重态/单重态的简并性。相反,置于两个对位的两个苯氧基自由基通过二苯二甲撑亚硅烷基桥以反铁磁方式相互作用,从而实现单线基态。