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ESE-Detected Molecular Motions of Spin-Labeled Molecules on a Solid Inorganic Surface: Motional Models and Onset Temperatures
Applied Magnetic Resonance ( IF 1 ) Pub Date : 2020-07-24 , DOI: 10.1007/s00723-020-01212-2
Elena A. Golysheva , Rimma I. Samoilova , Marta De Zotti , Fernando Formaggio , Marina Gobbo , Sergei A. Dzuba

Electron spin echo (ESE) decays are highly sensitive to stochastic librations which are a general property of molecular solids of various origins. Adsorption of spin-labeled molecules on a solid inorganic surface under diluted conditions allows studying the motion devoid of the effects of cooperativity. Here, the temperature dependence of the motion-induced spin relaxation was studied for different types of spin-labeled molecules adsorbed on a SiO2 surface. The spin relaxation rate for all the systems was found to attain well-defined maxima, which is in agreement with the model of uniaxial molecular librations. For spin-labeled stearic acid, the enhanced maximal relaxation rate was found which was interpreted as manifestation of two-axial (or planar) motion that is naturally expected for long flexible molecules. The data obtained suggest that the onset of the motions observed at two different temperatures, 100 K and 130 K, may be attributed to torsional and bending types of the motion, respectively. The models of non-cooperative motion developed for adsorbed molecules may become useful for analyzing motions in complex biological media, frozen ionic liquids, polymers, etc.

中文翻译:

固体无机表面上自旋标记分子的 ESE 检测分子运动:运动模型和起始温度

电子自旋回波 (ESE) 衰减对随机振动高度敏感,随机振动是各种来源的分子固体的一般特性。在稀释条件下,自旋标记分子在固体无机表面上的吸附允许研究没有协同效应的运动。在这里,针对吸附在 SiO2 表面上的不同类型的自旋标记分子,研究了运动引起的自旋弛豫的温度依赖性。发现所有系统的自旋弛豫率达到明确定义的最大值,这与单轴分子振动模型一致。对于自旋标记的硬脂酸,发现最大弛豫率增强,这被解释为长柔性分子自然预期的双轴(或平面)运动的表现。获得的数据表明,在两个不同温度(100 K 和 130 K)下观察到的运动开始可能分别归因于运动的扭转和弯曲类型。为吸附分子开发的非合作运动模型可用于分析复杂生物介质、冷冻离子液体、聚合物等中的运动。
更新日期:2020-07-24
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