基于多核脉冲核磁共振数据的浓缩LiTFSI溶液中组分在乙腈中的平移扩散

IF 1.1 4区物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Applied Magnetic Resonance Pub Date : 2025-07-21 DOI:10.1007/s00723-025-01774-z

Kirill A. Mukhin, Vladimir V. Matveev, Vladimir I. Chizhik

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引用次数: 0

摘要

在- 15 ~ + 75℃的温度范围内，测定了溶剂分子、阳离子和阴离子在浓缩“litfsi -乙腈”溶液中的扩散系数。计算了各组分扩散运动的活化能（Ea）。讨论了该系统的平移运动特点。数据表明，存在某种摩尔比为“salt/ACN”≈1/4.5的优势结构成分。乙腈分子在结构“马赛克”中比溶剂化离子移动得更自由。提出了一种描述快速平移运动和子结构间交换时扩散系数浓度依赖性的新方法。

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Translational Diffusion of Components in Concentrated LiTFSI Solutions in Acetonitrile According to Multinuclear Pulse NMR Data

The diffusion coefficients of solvent molecules, cations and anions in concentrated “LiTFSI–acetonitrile” solutions were measured in the temperature range from – 15 to + 75°C. The activation energies (E_a) for diffusion motion of each species were calculated. The features of translational motion in this system are discussed. The data indicate the existence of some predominant structural composition with the molar ratio “salt/ACN”≈1/4.5. The acetonitrile molecules move more freely in the structural “mosaic” than solvated ions. A new approach to describing the concentration dependencies of diffusion coefficients in the case of fast both translational motion and exchange between substructures is suggested.

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来源期刊

Applied Magnetic Resonance 物理-光谱学

CiteScore

1.90

自引率

10.00%

发文量

审稿时长

2.3 months

期刊介绍： Applied Magnetic Resonance provides an international forum for the application of magnetic resonance in physics, chemistry, biology, medicine, geochemistry, ecology, engineering, and related fields. The contents include articles with a strong emphasis on new applications, and on new experimental methods. Additional features include book reviews and Letters to the Editor.