EPR studies of nitrogen-centred free radicals. Part 53. Isolation, EPR spectra and magnetic characterization of N-(arylthio)-2,4-diaryl-6-cyanophenylaminyls
作者:Masaaki Nakatsuji、Yozo Miura、Yoshio Teki
DOI:10.1039/b100276g
日期:——
N-(Arylthio)-2,4-diaryl-6-ethoxycarbonylphenylaminyls (1), N-[(2,4-dichlorophenyl)thio]-2,4-diphenyl-6-acetylphenylaminyl (2), N-(arylthio)-2,4-diaryl-6-cyanophenylaminyls (3), N-[(2,4-dichlorophenyl)thio]-2,4-bis(4-chlorophenyl)-6-fluorophenylaminyl (4) and N-[(4-nitrophenyl)thio]-2,4-diphenylphenylaminyl (5) were generated by oxidation of the corresponding N-(arylthio)anilines. Although 4 and 5 were
N-(芳硫基)-2,4-二芳基-6-乙氧基羰基苯基氨基(1),N -[(2,4-二氯苯基)硫基] -2,4-二苯基-6-乙酰基苯基氨基(2),N-(芳硫基) -2,4-二芳基-6-氰基苯基氨基(3),N -[(2,4-二氯苯基)硫基] -2,4-双(4-氯苯基)-6-氟苯基氨基(4)和N -[(4 -硝基苯基)硫基] -2,4-二苯基苯基氨基(5)是通过氧化作用相应的N-(芳硫基)苯胺中的一个。虽然4和5分别短命和在30分钟内衰减,1 - 3是相当持久的和3可以分离作为自由基晶体。 EPR光谱测量产生的所有自由基的自由基并评估自旋密度分布。进行了从头算MO的计算(UHF Becke 3LYP / STO 6-31G),并对自旋密度分布进行了定量讨论。对三个分离的自由基进行了磁化率测量,SQUID磁力计。发现一个自由基与铁磁耦合,并且使用一维规则海森堡模型进行分析得出2 J / k B =