...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Nuclear Spin Relaxation in Paramagnetic Systems: Electron Spin Relaxation Effects under Near-Redifield Limit Conditions and Beyond
【24h】

Nuclear Spin Relaxation in Paramagnetic Systems: Electron Spin Relaxation Effects under Near-Redifield Limit Conditions and Beyond

机译：顺磁系统中的核自旋弛豫：在近Redifield极限条件及更高条件下的电子自旋弛豫效应

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

The analysis of experimental relaxometric profiles of paramagnetic complexes is usually performed using the Solomon-Bolembergen-Morgan (SBM) theory. The SBM theory is not valid for slowly rotating systems when the electronic levels are split at zero field, in which case a modified theory developed in Forence should be used. However, for many interesting systems, including Gd-based contrast agents for MRI, the electron spin relaxation is rather close to the Redifield limit, where none of these approaches is valid. In the present paper, the SBM theory and modified versions of the Forence model are compared against a general theory valid beyond the Redfield limit (the so-called slow-motion theory). Significant differences are found already for the cases where the electron spin relaxation is in a regime near the Redfield limit, but still within it. Indeed, the values of the parameters describing the electron spin relaxation are underestimated for the SBM theory relative to those used in calculating the slow-motion profiles. the present results are relevant for the interpretation of relaxometric profiles of paramagnetic complexes and proteins, and for the interpretation of the behavior of contrast agents used in MRI, and should be taken into account when planning the improvement of the relaxometric properties for the next generation of contrast agents based on theoretical predictions.
机译：通常使用Solomon-Bolembergen-Morgan（SBM）理论进行顺磁性配合物的实验弛豫谱分析。当电子能级在零场处分裂时，SBM理论不适用于缓慢旋转的系统，在这种情况下，应使用在Forence中开发的改进理论。但是，对于许多有趣的系统，包括用于MRI的基于Gd的造影剂，电子自旋弛豫非常接近Redifield极限，在这些极限中，这些方法均无效。在本文中，将SBM理论和Forence模型的修改版本与超出Redfield限制的有效一般理论（所谓的慢动作理论）进行了比较。对于电子自旋弛豫处于Redfield极限附近但仍在Redfield极限范围内的情况，已经发现了显着差异。实际上，相对于用于计算慢动作轮廓的参数而言，对于SBM理论而言，描述电子自旋弛豫的参数值被低估了。目前的结果与解释顺磁性复合物和蛋白质的弛豫谱特征以及解释MRI中使用的造影剂的行为有关，在计划改进下一代磁弛豫特性时应予以考虑。基于理论预测的对比剂。

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