Double electron-electron resonance in electron spin echo: Conformations of spin-labeled poly-4-vinilpyridine in glassy solutions
Double electron-electron resonance in electron spin echo: Conformations of spin-labeled poly-4-vinilpyridine in glassy solutions
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DOI：
10.1007/bf03164129
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发表时间：
1997-01-01
影响因子：
1
通讯作者：
Tsvetkov, YD
中科院分区：
文献类型：
--
作者：
Milov, AD;Tsvetkov, YD
用电子自旋回波双电子-电子共振方法研究了聚4-乙烯基吡啶在液氮中冻存的硝酰基自由基掺杂的玻璃态溶液。本文研究了自旋标记物由于未成对电子自旋-自旋相互作用而产生的相位弛豫。分离了自旋标记偶极-偶极相互作用对弛豫过程的分子内和分子间贡献。自旋标记物的分子内和分子间自旋-自旋相互作用导致回波信号对时间T的exp（-aT（q））型依赖。结果表明，对于分子内相互作用，实验q值为0.3，对于分子间相互作用，q值为2。由于在聚合物分子上存在足够高密度的电荷，因此已经做出了聚合物分子的线性结构的假设。
Double electron-electron resonance in electron spin echo has been used to study the glassy solutions of poly-4-vinylpyridine doped by nitroxyl radicals frozen in liquid nitrogen. The phase relaxation of spin labels due to spin-spin interaction of unpaired electrons has been studied. The intramolecular and intermolecular contributions of the dipole-dipole interaction of spin labels into relaxation process have been separated. It has been established that both the intramolecular and intermolecular spin-spin interaction of spin labels lead to the dependence of echo signal on time T of the exp(-aT(q)) type. It is shown that for the intramolecular interaction the experimental q value is 0.3, for the intermolecular one it is 2. The assumption has been made of the linear structure of polymeric molecules due to the presence of a sufficiently high density of an electric charge on polymeric molecules.