Existence of oriented ion-hydroxide clusters in concentrated aqueous NaCl solution at pH 13

被引:16
作者
Aziz, Emad F. [1 ]
Eisebitt, Stefan [1 ]
Eberhardt, Wolfgang
Cwiklik, Lukasz [2 ,3 ]
Jungwirth, Pavel [2 ,3 ]
机构
[1] BESSY MBH, D-13489 Berlin, Germany
[2] Acad Sci Czech Republic, Inst Organ Chem & Biochem, Prague 16610 6, Czech Republic
[3] Ctr Biomed & Complex Mol Syst, Prague 16610 6, Czech Republic
关键词
D O I
10.1021/jp075031w
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We probe the local electronic structure at solvated Na+ ions in I M aqueous NaCl solutions as a function of pH. A dramatic change in the Na+ white line intensity in X-ray absorption is observed for high pH values, reflecting a changing local electronic structure at the Na+ ions when OH- is present. Given the relative abundance of sodium and hydroxide ions, we conclude that one OH- affects at least 2.4 +/- 0.6 Na+ ions in an electronically noticeable way at pH 13. From the experimental data we infer that spatially extended clusters or networks incorporating Na+ and OH- can exist in the electrolyte solution. The experimental data are complemented by molecular dynamics simulations, which indicate the presence of structured clusters incorporating Na+, OH-, and solvent molecules.
引用
收藏
页码:1262 / 1266
页数:5
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