波谱学杂志 ›› 1992, Vol. 9 ›› Issue (4): 353-359.

• 研究论文 • 上一篇    下一篇

聚对苯撑中杂质诱导的磁性缺陷

金长清1, 王刘坤1, 刘雅言2   

  1. 1. 中国科学院长春物理研究所, 长春 130021;
    2. 中国科学院长春应用化学研究所
  • 收稿日期:1991-04-23 修回日期:1992-03-30 出版日期:1992-12-05 发布日期:2018-01-20
  • 基金资助:
    国家自然科学基金资助项目和中国科学院长春物理所激发态过程开放实验室资助课题

IMPURITY INDUCED MAGNETIC DEFECTS IN POLY(PARAPHENYLENE)

Jin Changqing1, Wang Liukun1, Liu Yayan2   

  1. 1. Changchun Institute of Physics, Chinese Academy of Sciences, 130021 Changchun;
    2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130021 Changchun
  • Received:1991-04-23 Revised:1992-03-30 Online:1992-12-05 Published:2018-01-20

摘要: 本工作研究了掺FeCl3和掺碘聚对苯撑(PPP)样品中与极化子相互转化有关的电子顺磁共振(EPR)谱特性.在掺碘的样品中,我们观测到一种新的实验现象:室温线宽△Hpp(RT)、自旋浓度Nspin对掺碘浓度的特有依赖关系,即随碘浓度N (Ⅰ)的增大,△Hpp首先减小又增大,然后再次减小重又增大.与此对应,自旋浓度首先升高又下降,然后再次升高又下降.然而,在掺FeCl3的样品中,△Hpp和Nspin没有出现象在掺碘的样品中那种变化现象,而是随掺FeCl3浓度增大,△Hpp,首先减小而后增大.相对应地,Nspin首先升高而后下降.本文着重探讨了产生上述差别的原因.由于聚合物链上的自旋和掺杂分子相互作用,观测到的g因子数值接近自由基g值,并且基本上不随掺杂种类、温度的变化而变化.

关键词: 电子顺磁共振, 自旋浓度, 极化子

Abstract: We have investigated the properties of electron paramagnetic resonance (EPR) spectra from undoped-, FeCl3-and iodine-doped poly (paraphenylene) (PPP) prepared by the method of Kovacic. EPR measurements were used to characterize electronic states relevant for polaron transformation in doped PPP. it was found that a novel phenomenon of ihe dependence of room temperature linewidth(△Hpp) and spin concentration (Nspin) on the dopant concentrations for iodine-doped PPP, namely, △Hpp first decreased and increased; and then decreased and increased again with increasing of iodine concentrations in the iodine-doped PPP, Correspondingly, Nspin first increased and decreased; and then increased and decreased again with increasing of iodine concentration in PPP. However, the changes of △Hpp and Nspin in FeCl3-doped PPP are not similar to those in the iodine-doped PPP system. We explained this difference、Due to the interaction between spins on the polymer chains and dopant molecule, the observed g-factor values are close to the free electron value and do not substantially vary with the kind of dopant and temperature.

Key words: EPR, Spin concentration, Polaron