Ferromagnetic Behavior of Formyl-Group-Carrying Stable Thioaminyl Radicals1
摘要:
Four formyl-group-carrying thioaminyl radicals were generated, and one radical could be isolated as radical crystals. Magnetic susceptibility measurements of the isolated radical showed a ferromagnetic regular linear-chain interaction of 2J/k(B) = 3.2 K, which was explained in terms of the X-ray crystallographic results.
Certain pyrrolecarboxylic and pyrroleacetic acid derivatives substituted on the pyrrole ring with thioether groups, acyl groups, phenyl, substituted phenyl, phenoxy, substituted phenoxy, benzyl or halo and optionally substituted on the pyrrole nitrogen with alkyl, and the pharmaceutically acceptable salts thereof, are useful in lowering the blood glucose levels of hyperglycemic animals.
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 =
Exceptionally Persistent Nitrogen-Centered Free Radicals. Syntheses, ESR Spectra, Isolation, and X-ray Crystallographic Structures of <i>N</i>-(Arylthio)-2-<i>tert</i>-butyl-4,6-diarylphenylaminyl and <i>N</i>-(Arylthio)-4-<i>tert</i>-butyl-2,6-diarylphenylaminyl Radicals<sup>1</sup>
crystallographic structures of 1b and 2b are determined by the X-ray crystallographic analyses. Aminyls 1 and 2 give similar ESRspectra consisting of 1:1:1 triplets with the a(N) values of 0.921-0.948 mT. Deuteration of the phenyl groups on the anilino benzene ring gives rise to a further splitting of the nitrogen 1:1:1 triplet by the anilino meta (0.126-0.138) and phenylthiyl ortho and para protons (0.077-0.096
Generation, ESR Spectra, and Isolation of<i>N</i>-(Arylthio)-2,4,6-triarylphenylaminyl Radicals. Influence of the Substituents on the 2,4,6-Triphenyl Groups on the Stabilities of Radicals
作者:Yozo Miura、Yuichi Kitagishi、Sadaharu Ueno
DOI:10.1246/bcsj.67.3282
日期:1994.12
Three N-(Arylthio)-2,4,6-tris(4-methylphenyl)-, three N-(arylthio)-2,4,6-tris(3-chlorophenyl)-, and five N-(arylthio)-2,4,6-tris(4-chlorophenyl)phenylaminyl radicals have been generated by PbO2 oxidation of the corresponding N-(arylthio)-2,4,6-triarylanilines and their isolation has been carried out. When electron-donating methyl groups were substituted at the p-positions of the 2,4,6-triphenyl groups
<i>N</i>,<i>N</i>′-BIS(ARYLTHIO)BENZAMIDINYL RADICALS. A NEW CLASS OF PERSISTENT NITROGEN-CENTERED FREE RADICALS
作者:Yozo Miura、Teruo Kunishi、Masayoshi Kinoshita
DOI:10.1246/cl.1983.885
日期:1983.6.5
N,N′-Bis(arylthio)benzamidinyl radicals were generated and studied by ESR spectroscopy. They were extremely persistent in solution, even in the presence of oxygen.