Rajca, Andrzej; Rajca, Suchada; Desai, Shailesh R., Journal of the American Chemical Society, 1995, vol. 117, # 2, p. 806 - 816
作者:Rajca, Andrzej、Rajca, Suchada、Desai, Shailesh R.
DOI:——
日期:——
High-Spin Cation Radicals of Methylenephosphoranes
作者:Martijn M. Wienk、René A. J. Janssen
DOI:10.1021/ja964185e
日期:1997.6.1
di(cationradical)s and tri(cationradical)s are prepared by oxidation of the corresponding 1,3-phenylenebis[[(4-tert-butylphenyl)methylene]triphenylphosphorane] and 1,3,5-benzenetriyltris[[(4-tert-butylphenyl)methylene]triphenylphosphorane] precursors. The oligo(cationradical)s are investigated in frozen solutions using ESR spectroscopy. The di(cationradical) has a triplet state as evidenced from
通过氧化相应的 1,3-亚苯基双[[(4-叔丁基苯基)亚甲基]三苯基正膦]和 1,3,5-苯三基三[[( 4-叔丁基苯基)亚甲基]三苯基正膦]前体。使用 ESR 光谱研究冷冻溶液中的低聚(阳离子自由基)。从 ΔMs = ±2 ESR 跃迁证明,二(阳离子自由基)具有三重态,表现出与两个相同磷核的超精细耦合,其特征在于零场分裂参数 D = 350 MHz 和 E = 0 MHz。相应的三(阳离子自由基)具有 D = 262 MHz 和 E = 0 MHz 的四重态,并表现出 ΔMs = ±3 跃迁。温度相关研究 (4−100 K) 表明 ESR 强度遵循居里定律,与高自旋基态一致。