甲基二硫氧化物如何破坏基功能化离子液体中的键网络
Johanna Busch1, Ralf Ludwig1,2,3, Dietmar Paschek1
1Institut für Chemie, Physikalische und Theoretische Chemie, Universität Rostock, Albert-Einstein-Straße 27, D-18059 Rostock, Germany.
The journal of physical chemistry. B
|February 26, 2025
概括
甲基二硫氧化物 (DMSO) 破坏了基功能化的离子液体中的键. 添加DMSO会降低粘度,并改变键网络,影响离子液体内的分子相互作用.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
背景情况:
- 具有基函数组的离子液体 (IL) 呈现出复杂的键 (HB) 网络.
- 了解这些网络对于设计具有量身定制属性的IL至关重要.
- 甲基二硫氧化物 (DMSO) 被研究为一种键捕获剂,以修改IL的行为.
研究的目的:
- 为了研究DMSO对氧功能化的离子液体HB网络的影响.
- 量化不同HB物种的热力学稳定性和动力学.
- 为了将HB网络的变化与IL-DMSO混合物的粘度相关联.
主要方法:
- 使用了分子动力学 (MD) 模拟.
- 使用范特霍夫分析分析键群体及其热力学稳定性的分析.
- 使用HB人口相关函数对HB动态的研究.
主要成果:
- 确定了三个特征性HBs:阴离子-阴离子 (c-a),阴离子-阴离子 (c-c) 和阴离子-DMSO (c-m).
- 添加DMSO显著破坏了本地IL HB网络.
- 稳定的阴离子-DMSO HBs在低度时促进DMSO分散,而DMSO-DMSO接触者则相互竞争.
- 阴离子-阴离子HBs通常是最弱的;阴离子-DMSOHBs比阴离子-阴离子HBs更强.
- 乙型肝炎动力学与粘度相关性很好,在添加DMSO时,粘度显著下降.
结论:
- DMSO作为一种有效的HB捕捉剂,改变了IL的HB网络结构.
- 观察到的HB网络和动力学变化解释了粘度的显著下降.
- 模拟结果与现有实验数据有很好的一致性,验证了该方法.
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