Inter-spin interaction of CLPOT inclusion compounds with 1D molecular chains of 4-X-TEMPO radicals in the temperature range of 4.2-300 K
Inter-spin interaction of CLPOT inclusion compounds with 1D molecular chains of 4-X-TEMPO radicals in the temperature range of 4.2-300 K
复制标题
4.2-300 K温度范围内CLPOT包合物与4-X-TEMPO自由基一维分子链的自旋间相互作用
DOI：
10.1246/bcsj.20170333
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Yuka Morinaga
中科院分区：
文献类型：
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作者：
Hirokazu Kobayashi;Hitoshi Takamisawa;Y. Furuhashi;Haruka Nakagawa;K. Nakatsugawa;Kanae Takeuchi;Yuka Morinaga
在4.2 ~ 300 K温度范围内，以有机一维纳米孔道为模板，对[CLPOT-（4-X-TEMPO）]包合物（CLPOT = 2，4，6-三（4-氯苯氧基）-1，3，5-三嗪，4-X-TEMPO = 4-取代-2，2，6，6-四甲基-1-哌啶氧基自由基）进行了ESR测量. [CLPOT-（4-X-TEMPO）]的各向同性ESR谱的峰-峰线宽（ΔBpp）在整个温度范围内比基于刚性晶格模型的二阶矩的货车Vleck公式的估计窄得多。此外，[CLPOT-（4-X-TEMPO）]的ESR谱线在整个温度范围内都是洛伦兹型的，而我们以前用三（邻苯二氧基）环三磷腈（TPP）作为模板的ESR谱线是温度依赖性的。这些结果表明，[CLPOT-（4-X-TEMPO）]的ESR谱线宽度变窄可能不是由运动窄化引起的，而是由三维交换引起的。
ESR measurements of [CLPOT-(4-X-TEMPO)] inclusion compounds (CLPOT = 2,4,6-tris(4-chlorophenoxy)-1,3,5-triazine, and 4-X-TEMPO = 4-substituted-2,2,6,6-tetramethyl-1-piperidinyloxyl radical) with 1D organic-radical molecular chains constructed in organic 1D nanochannels used as templates were conducted in the range of temperatures from 4.2 to 300 K. The peak-to-peak line width (ΔBpp) of all isotropic ESR spectra of the [CLPOT-(4-X-TEMPO)] was much narrower in the whole temperature range than the estimation based on the Van Vleck’s formula for the second moment of the rigid lattice model. In addition, the line profiles of all ESR spectra of the [CLPOT-(4-X-TEMPO)] became Lorentzian in the whole temperature range, compared with our previous results using tris(o-phenylenedioxy)cyclotriphosphazene (TPP) as templates in which the ESR profiles were temperature-dependent. These results indicate that the narrower ESR line width of the [CLPOT-(4-X-TEMPO)] may be caused not by motional narrowing but by 3D exchange i...