Probing ion-specific effects on aqueous acetate solutions: Ion pairing versus water structure modifications.
Probing ion-specific effects on aqueous acetate solutions: Ion pairing versus water structure modifications.
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DOI：
10.1063/1.4884600
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发表时间：
2014-05
期刊：
影响因子：
--
通讯作者：
Aziz EF
中科院分区：
文献类型：
--
作者：
Petit T;Lange KM;Conrad G;Yamamoto K;Schwanke C;Hodeck KF;Dantz M;Brandenburg T;Suljoti E;Aziz EF
用氧K边X射线吸收光谱(XAS)、X射线发射光谱和液体微射流的共振非弹性X射线散射(RIXS)表征了一价阳离子(Li+、K+、NH4+、Na+)对氯化物和醋酸盐溶液中水结构的影响。我们显示了离子和反离子对氧K边发射光谱的影响，我们将其归因于水的氢键网络的改变。对于乙酸酯，XAS和RIXS也选择性地探索了与羧酸盐的离子配对。我们将我们的实验结果与物种形成数据和阳离子的盐析性质相关联。
The effect of monovalent cations (Li+, K+, NH4+, Na+) on the water structure in aqueous chloride and acetate solutions was characterized by oxygen K-edge X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy, and resonant inelastic X-ray scattering (RIXS) of a liquid microjet. We show ion- and counterion dependent effects on the emission spectra of the oxygen K-edge, which we attribute to modifications of the hydrogen bond network of water. For acetates, ion pairing with carboxylates was also probed selectively by XAS and RIXS. We correlate our experimental results to speciation data and to the salting-out properties of the cations.