Features of Spin Exchange in Nitroxide Biradicals in the Ionic Liquid bmimPF_6

V.A.Tran; A.I.Kokorin; G. Grampp; K.Rasmussen

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Features of Spin Exchange in Nitroxide Biradicals in the Ionic Liquid bmimPF_6

机译：离子液体bmimPF_6中一氧化二氮自由基的自旋交换特征

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The intramolecular electron spin exchange has been studied by electron paramagnetic resonance (EPR) spectroscopy in the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF_6) for various nitroxide biradicals as a function of temperature and the nature of the connecting bridge between two >NO centers. Temperature variations of the isotropic nitrogen hyperfine splitting constant and exchange integral values |J/a| were measured from EPR spectra and analyzed. Thermodynamic parameters of the conformational rearrangements were obtained. The spin exchange in rigid and flexible biradicals dissolved in the ionic liquid bmimPF6 was compared with that in toluene solutions. Interesting features of the spin exchange in biradicals in ionic liquid were observed and explained as a result of the specific intramolecular conformational transitions. The first example of a rather rigid biradical molecule becoming flexible under the influence of an ionic liquid is reported.

机译：分子内电子自旋交换已通过电子顺磁共振（EPR）光谱研究了离子液体1-丁基-3-甲基咪唑六氟磷酸盐（bmimPF_6）中各种氮氧化物双自由基与温度的关系以及两个>之间的连接桥的性质没有中心。各向同性氮超细分裂常数的温度变化和交换积分值| J / a |从EPR光谱测量并分析。获得了构象重排的热力学参数。将溶于离子液体bmimPF6的刚性和柔性双自由基的自旋交换与甲苯溶液中的自旋交换进行了比较。观察到并解释了双自由基在离子液体中自旋交换的有趣特征，这是特定分子内构象转变的结果。报道了在离子液体的影响下相当刚性的双自由基分子变得柔性的第一个例子。

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《Applied Magnetic Resonance》 |2008年第3期|共10页
作者
V.A.Tran; A.I.Kokorin; G. Grampp; K.Rasmussen;
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正文语种 eng
中图分类磁性弛豫及共振现象;
关键词
biradicals dissolved; methylimidazolium hexafluorophosphate; conformational transitions;

机译：双自由基溶解;甲基咪唑六氟磷酸盐;构象转变;

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1. Features of Spin Exchange in Nitroxide Biradicals in the Ionic Liquid bmimPF_6 [J] . V.A.Tran, A.I.Kokorin, G. Grampp, Applied Magnetic Resonance . 2008,第3期

机译：离子液体bmimPF_6中一氧化二氮自由基的自旋交换特征
2. Features of Spin Exchange in Short-Chain Nitroxide Biradicals in Ionic Liquids [J] . A. I. Kokorin, V. A. Tran, G. A. Vorobieva Applied Magnetic Resonance . 2010,第s1a4期

机译：离子液体中短链一氧化氮双自由基的自旋交换特征
3. Features of spin exchange in nitroxide biradicals in the ionic liquid bmimPF₆ [J] . V. A. Tran, Aleksandr I. Kokorin, G. Grampp, Applied Magnetic Resonance . 2009,第3期

机译：离子液体bmimPF _{6 中一氧化氮双自由基的自旋交换特征}
4. Microwave Assisted Preparation and Characterization of Ionic Liquid BmimPF_6 and Synthesis and Characterization of Titanium Dioxide Using BmimPF_6 as Medium [C] . Wu Yarui, Guan Weisheng, Lin Shu International Conference on Environmental Biotechnology and Materials Engineering . 2011

机译：使用BMIM PF_6作为培养基，微波辅助制备和表征离子液体BMIM PF_6和二氧化钛的合成及表征
5. Theoretical and computational studies of renewable energy materials: Room temperature ionic liquids and proton exchange membranes. [D] . Feng, Shulu. 2011

机译：可再生能源材料的理论和计算研究：室温离子液体和质子交换膜。
6. Structural factors controlling the spin-spin exchange coupling: EPR spectroscopic studies of strongly asymmetric trityl-nitroxide biradicals [O] . Yangping Liu, Frederick A. Villamena, Antal Rockenbauer, -1

机译：结构性因素控制自旋交换耦合：强烈不对称的三苯甲基氮氧双自由基的EpR光谱研究
7. EPR Line Shifts and Line Shape Changes Due to Spin Exchange of Nitroxide-Free Radicals in Liquids 4. Test of a Method to Measure Re-Encounter Rates in Liquids Employing 15N and 14N Nitroxide Spin Probes [O] . Barney L. Bales, Miroslav Peric 2016

机译：由于液体中无氮自由基的自旋交换引起的EpR线移位和线形变化4.使用15N和14N氮氧自旋探针测量液体中再遇率的方法测试
8. Minor Actinide Separations Using Ion Exchangers or Ionic Liquids [R] . Hobbs, D. T., Clearfield, A., Visser, A. E., 2011

机译：使用离子交换剂或离子液体进行少量act系元素分离

Features of Spin Exchange in Nitroxide Biradicals in the Ionic Liquid bmimPF_6

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