Chem. J. Chinese Universities ›› 1983, Vol. 4 ›› Issue (4): 469.
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Liu Youcheng, Liu Zhongli, Wang Yukun
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Abstract: Six differently 4-substituted 2, 2, 6, 6-tetramethylpiperidyl-N-oxides were synthesized and their ESR hfs constants aN determined in n-hexane and glycol respectively. It is shown that an approximate linear correlation between αN and Pauling's electronegativity x of the 4-substituent is present for both solvents, but the slopes of the αN-x straight lines are very different. Based on the EHMO calculations it is proposed that the effect of 4-substituent on aN may be caused by a kind of field effect which affects the spin density (i. e., the electron distribution in the frontier orbital) and the "out of plane angle" (i. e., the hybridization of the N atom). The solvent effect is explained in terms of the EHMO calculations, too.
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Liu Youcheng, Liu Zhongli, Wang Yukun . STUDIES ON NITROXIDES (Ⅴ)——THE EFFECT OF 4-SUBSTITUENT ON THE ESR hfs CONSTANTS OF PIPERIDINE NITROXIDES[J]. Chem. J. Chinese Universities, 1983, 4(4): 469.
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http://www.cjcu.jlu.edu.cn/EN/Y1983/V4/I4/469