Solvation properties of silver ions in ionic liquids using attenuated total reflectance ultraviolet spectroscopy

Solvation properties of silver ions in ionic liquids using attenuated total reflectance ultraviolet spectroscopy
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使用衰减全反射紫外光谱法研究离子液体中银离子的溶剂化特性

DOI:
10.1016/j.molliq.2022.119998
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发表时间:
2022
影响因子:
6
通讯作者:
Fukui K.
Fukui K.
中科院分区:
化学2区
文献类型:
--
作者:
Imai Masaya;Tanabe Ichiro;Ozaki Yukihiro;Fukui K.

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用衰减全反射-紫外(ATR-UV)光谱研究了N-丁基-N-甲基吡咯烷二氰胺盐([BMP][DCA])在银离子周围的溶剂化结构.将Ag+添加到[BMP][DCA]中使[DCA]−吸收带发生红移。位移方向是相反的,由另外的Li+所造成的,这些光谱的变化,定性再现使用量子化学计算。使用多变量分析(多变量曲线分辨率-交替最小二乘法; MCR-ALS)和分子动力学模拟将ATR-UV光谱分解为单独的[DCA]-和Ag-溶剂化[DCA]-光谱。多变量分析和分子动力学模拟均表明,Ag+周围[DCA]-的配位数约为-5。所提出的方法,使用光谱技术,光谱分解,和模拟可用于各种溶剂化结构,这是电化学的基本特征的定量调查。
The solvation structures ofN-butyl-N-methylpyrrolidinium dicyanamide ([BMP][DCA]) surrounding silver ions were investigated using attenuated total reflectance-ultraviolet (ATR-UV) spectroscopy. The addition of Ag+to [BMP][DCA] red-shifted the [DCA]−absorption band. The shift direction was opposite to that caused by the addition of Li+, and these spectral shifts were qualitatively reproduced using quantum chemical calculations. Multivariate analysis (the multivariate curve resolution-alternating least squares; MCR-ALS) and molecular dynamics simulations were used to decompose the ATR-UV spectra into separate [DCA]−and Ag-solvated [DCA]−spectra. Both multivariate analysis and molecular dynamics simulation showed that the coordination number of [DCA]−around Ag+was approximately-five. The proposed method using spectroscopic techniques, spectral decomposition, and simulations can be used for the quantitative investigation of various solvation structures, which are fundamental features in electrochemistry.
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