ELECTRON NUCLEAR DOUBLE RESONANCE SPECTROSCOPY OF SOLITONS AND POLARONS IN CONJUGATED POLYMERS
ELECTRON NUCLEAR DOUBLE RESONANCE SPECTROSCOPY OF SOLITONS AND POLARONS IN CONJUGATED POLYMERS
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共轭聚合物中孤子和极化子的电子核双共振谱
DOI：
10.1142/s0217979295000124
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发表时间：
1995
影响因子：
1.7
通讯作者：
S. Kuroda
中科院分区：
文献类型：
--
作者：
S. Kuroda
共轭聚合物中的孤子和极化子等新型元激发携带未成对电子。在这种情况下，共轭链上质子的电子核双共振（ENDOR）提供了一种独特的方法来观察它们的波函数。这个信息有两个重要的意义。首先，它给出了孤子和极化子的空间扩展，这是检验这些自局域激发的真实性所必需的量。其次，直接探讨了电子关联的程度。在有限电子关联的情况下，自旋密度分布中出现负自旋位。由于定向聚合物的非单晶性质，只有在对这些材料进行仔细研究之后，才能对包含这些信息的波函数进行独特而详细的测定。在这篇文章中，我回顾了我们的ENDOR研究孤子在聚乙炔和极化子在聚（对苯乙烯），使用拉伸取向的样品进行。所有的分析都是基于π电子的性质，这些性质在取向样品中表现出特征的各向异性。所观察到的自旋分布与理论结果进行了比较，并显示为共轭聚合物的进一步分析的基础。
Novel elementary excitations such as solitons and polarons in conjugated polymers carry unpaired electrons. In this case electron nuclear double resonance (ENDOR) of protons on the conjugated chain provides a unique method to observe their wavefunctions. This information has two significant meanings. Firstly, it gives the spatial extension of solitons and polarons, the quantity that is essential in examining the reality of these self-localized excitations. Secondly, it directly probes the degree of electron correlation. In the case of finite electron correlation, negative spin sites appear in the spin-density distribution. The unique and detailed determination of the wavefunctions containing such information can be made only after the careful studies of oriented polymers because of the non-single-crystalline nature of these materials. In this article I review our ENDOR studies on solitons in polyacetylene and polarons in poly(paraphenylene vinylene), performed using stretch-oriented samples. All the analyses are based on the properties of π-electrons which show characteristic anisotropy in oriented samples. The observed spin distributions are compared with theoretical results as well as shown as the basis for further analyses of conjugated polymers.