• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Electron spin resonance and ultraviolet spectral analysis of UV-irradiated PVA films filled with MnCl2 and CrF3
【24h】

Electron spin resonance and ultraviolet spectral analysis of UV-irradiated PVA films filled with MnCl2 and CrF3

机译：MnCl2和CrF3填充的PVA薄膜的电子自旋共振和紫外光谱分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

PVA films with various filling levels of CrF3 and MnCl2 were prepared. ESR and UV/VIS optical analysis were used to shed more light on the structural modification that occur due to filling with different levels and/or UV irradiation. The ESR analysis revealed that the spin configuration of CrF3, MnCl2, and CoBr2-filled PVA are different. The filling level dependence of ESR parameters was discussed. The UV-VIS spectral analysis for pure PVA shows absorption bands at 265 and 280 nm, which were assigned to the presence of carbonyl groups. The addition of CrF3 led to the appearance of another bands at 418 and 596 nm. The filling level and/or UV irradiation have no effect on the position of absorption bands but the intensity of these bands has been changed. The addition of MnCl2 led to a new band at about 350 nm due to charge transfer transition. The ligand field parameters and optical energy gaps can be calculated and discussed. The results of optical and ESR analysis indicated that the Cr3+ or Mn2+ are present in its octahedral symmetrical form within the PVA Matrix. SEM micrographs of CrF3 filled PVA is discussed. (C) 2003 Wiley Periodicals, Inc. [References: 23]
机译：制备了具有各种填充水平的CrF3和MnCl2的PVA膜。使用ESR和UV / VIS光学分析，可以更好地了解由于填充不同水平和/或UV辐射而发生的结构改性。 ESR分析表明，CrF3，MnCl2和CoBr2填充的PVA的自旋构型不同。讨论了ESR参数的填充水平依赖性。纯PVA的UV-VIS光谱分析显示在265和280 nm处的吸收带，这些吸收带被指定为存在羰基。 CrF3的添加导致在418和596 nm处出现另一个谱带。填充水平和/或紫外线辐射对吸收带的位置没有影响，但是这些带的强度已经改变。由于电荷转移跃迁，MnCl 2的添加导致在约350 nm处出现新的能带。可以计算和讨论配体场参数和光能隙。光学和ESR分析的结果表明，Cr3 +或Mn2 +以八面体对称形式存在于PVA基质中。讨论了CrF3填充的PVA的SEM显微照片。 （C）2003 Wiley Periodicals，Inc. [参考：23]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号