The molecular orientation and dynamics were examined for 4-acetamido-2,2,6,6-tetramethyl-1-piperidinyloxyl (4-acetamido-TEMPO) radicals, which have a larger substituent group than many other TEMPO radicals, dispersed in the one-dimensional (1D) nanochannel of 2,4,6-tris(4-chlorophenoxy)-1,3,5-triazine (CLPOT) with 4-substituted-2,2,6,6-tetramethylpiperidine (R-TEMP; R=OH or H). When TEMPOH (R=OH) was used as a spacer for dispersion in the CLPOT nanochannels, the molecular orientation of 4-acetamido-TEMPO in the CLPOT nanochannels was similar to that of other previously reported 4-substituted-TEMPO (4-X-TEMPO; X=OH, =O or OCH3) radicals. However, the activation energy for the rotational diffusion of 4-acetamido-TEMPO in the CLPOT nanochannels, estimated to be 11 kJ mol−1, was larger than that of other 4-X-TEMPO molecules (6–8 kJ mol−1). These results indicate that the molecular dynamics of 4-X-TEMPO in the CLPOT nanochannels can be controlled by the selection of a larger substituent X at the 4-position in 4-X-TEMPO (in this study, X=NHCOCH3), and also suggest an important concept for the design of new organic magnets.

中文翻译：

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具有分散在 2,4,6-Tris(4-Chlorophenoxy)-1,3 的一维纳米通道中的大量取代基的 2,2,6,6-四甲基-1-哌啶基氧基衍生物的分子取向和动力学， 5-三嗪结晶

研究了 4-acetamido-2,2,6,6-tetramethyl-1-piperidyloxyl (4-acetamido-TEMPO) 自由基的分子取向和动力学，它们具有比许多其他 TEMPO 自由基更大的取代基，分散在一个2,4,6-三(4-氯苯氧基)-1,3,5-三嗪 (CLPOT) 与 4-取代-2,2,6,6-四甲基哌啶 (R-TEMP; R) 的一维 (1D) 纳米通道=OH 或 H)。当 TEMPOH (R=OH) 用作分散在 CLPOT 纳米通道中的间隔物时，CLPOT 纳米通道中 4-乙酰氨基-TEMPO 的分子取向与之前报道的其他 4-取代-TEMPO (4-X- TEMPO；X=OH、=O 或 OCH3) 自由基。然而，CLPOT 纳米通道中 4-乙酰氨基-TEMPO 旋转扩散的活化能估计为 11 kJ mol-1，大于其他 4-X-TEMPO 分子 (6-8 kJ mol-1) .