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多频脉冲电子顺磁共振与分子动力学表征

Multifrequency Pulsed EPR and the Characterization of Molecular Dynamics.

作者信息

Eaton Sandra S, Eaton Gareth R

机构信息

Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado, USA.

Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado, USA.

出版信息

Methods Enzymol. 2015;563:37-58. doi: 10.1016/bs.mie.2015.06.028. Epub 2015 Aug 1.

DOI:10.1016/bs.mie.2015.06.028
PMID:26478481
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5380387/
Abstract

In fluid solution, motion-dependent processes dominate electron spin-lattice relaxation for nitroxides and semiquinones at frequencies between 250 MHz and 34 GHz. For triarylmethyl radicals, motion-dependent processes dominate spin-lattice relaxation at frequencies below about 3 GHz. The frequency dependence of relaxation provides invaluable information about dynamic processes occurring with characteristic times on the order of the electron Zeeman frequency. Relaxation mechanisms, methods of measuring spin-lattice relaxation, and motional processes for nitroxide, semiquinone, and triarylmethyl radicals are discussed.

摘要

在流体溶液中，对于氮氧化物和半醌，在250 MHz至34 GHz频率范围内，与运动相关的过程主导着电子自旋 - 晶格弛豫。对于三芳基甲基自由基，在低于约3 GHz的频率下，与运动相关的过程主导着自旋 - 晶格弛豫。弛豫的频率依赖性提供了有关以电子塞曼频率量级的特征时间发生的动态过程的宝贵信息。本文讨论了氮氧化物、半醌和三芳基甲基自由基的弛豫机制、测量自旋 - 晶格弛豫的方法以及运动过程。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/af8a56a2a3d8/nihms852245f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/33d92609326d/nihms852245f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/4f730e42b609/nihms852245f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/977e544b8b27/nihms852245f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/735ea2be9032/nihms852245f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/a27f4f5c3eb2/nihms852245f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/af8a56a2a3d8/nihms852245f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/33d92609326d/nihms852245f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/4f730e42b609/nihms852245f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/977e544b8b27/nihms852245f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/735ea2be9032/nihms852245f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/a27f4f5c3eb2/nihms852245f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0bcc/5380387/af8a56a2a3d8/nihms852245f6.jpg

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本文引用的文献

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Rev Sci Instrum. 2019 Feb;90(2):024102. doi: 10.1063/1.5043316.
2
Electron spin-lattice relaxation mechanisms of nitroxyl radicals in ionic liquids and conventional organic liquids: temperature dependence of a thermally activated process.离子液体和传统有机液体中硝酰自由基的电子自旋-晶格弛豫机制：热激活过程的温度依赖性
J Phys Chem B. 2015 Mar 26;119(12):4501-11. doi: 10.1021/acs.jpcb.5b00431. Epub 2015 Mar 16.
3
Frequency dependence of electron spin-lattice relaxation for semiquinones in alcohol solutions.
醇溶液中半醌类化合物电子自旋-晶格弛豫的频率依赖性
J Magn Reson. 2014 Oct;247:81-87. doi: 10.1016/j.jmr.2014.08.014. Epub 2014 Sep 9.
4
Electron spin-lattice relaxation mechanisms of rapidly-tumbling nitroxide radicals.快速旋转的氮氧自由基的电子自旋晶格弛豫机制。
J Magn Reson. 2013 Nov;236:47-56. doi: 10.1016/j.jmr.2013.08.006. Epub 2013 Aug 22.
5
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J Magn Reson. 2012 Dec;225:52-7. doi: 10.1016/j.jmr.2012.10.002. Epub 2012 Oct 17.
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Relaxation times and line widths of isotopically-substituted nitroxides in aqueous solution at X-band.在 X 波段下水溶液中同位素取代的氮氧自由基的弛豫时间和谱线宽度。
J Magn Reson. 2011 Oct;212(2):370-7. doi: 10.1016/j.jmr.2011.07.018. Epub 2011 Jul 29.
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