Persistent 1,3,5-benzenetriyltris(N-tert-butyl nitroxide) and its analogs with quartet ground states. Intramolecular triangular exchange coupling among three nitroxide radical centers
Persistent 1,3,5-benzenetriyltris(N-tert-butyl nitroxide) and its analogs with quartet ground states. Intramolecular triangular exchange coupling among three nitroxide radical centers
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持久性 1,3,5-苯三基三（N-叔丁基硝基氧）及其具有四重基态的类似物。
DOI：
10.1021/j100152a034
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
H. Iwamura
中科院分区：
文献类型：
--
作者：
F. Kanno;K. Inoue;N. Koga;H. Iwamura
合成了1，3，5-苯三基三（N-叔丁基氮氧自由基）（3）、其2-甲氧基衍生物（4）和1，3，5-三{对-（N-氧-N-叔丁基氨基）苯基}苯（5），并通过EPR和磁化率/磁化强度测量进行了研究。三氮氧化物3和4显示出四重态特征的EPR精细结构：3：g= 2，0062，|日/hc| =0.009 32 cm-1，|E/hc| =0.000 15 cm-1; 4：g=2.0063，|日/hc| =0.009 66 cm-1，|E/hc| =0.000 32 cm-1。在10-100 K范围内，信号强度随温度倒数的变化符合居里定律，表明四重态是它们的基态。3和4在1.8、3.0和4.0 K下的磁化强度数据在0-7 T的磁场范围内服从布里渊函数，其中S=3/2
1,3,5-Benzenetriyltris(N-tert-butyl nitroxide (3), its 2-methoxy derivative (4), and 1,3,5-tris{p-(N-oxy-N-tert-butylamino)phenyl}benzene (5) were prepared and studied by EPR and magnetic susceptibility/magnetization measurements. Trinitroxides 3 and 4 showed EPR fine structures characteristic of quartet states: 3: g=2,0062, |D/hc|=0.009 32 cm -1 and |E/hc|=0.000 15 cm -1 ; 4: g=2.0063, |D/hc|=0.009 66 cm -1 and |E/hc|=0.000 32 cm -1 . The changes in the signal intensity vs reciprocal temperature obeyed Curie's law in the range 10-100 K, suggesting that the quartets are their ground states. Magnetization data for 3 and 4 at 1.8, 3.0, and 4.0 K in the field range 0-7 T obeyed the Brillouin function in which S=3/2