Spectroscopic evidence for the specific Na+ and K+ interactions with the hydrogen-bonded water molecules at the electrolyte aqueous solution surfaces

被引:27
作者
Feng, Ran-ran [1 ,2 ]
Bian, Hong-tao [1 ,2 ]
Guo, Yuan [1 ]
Wang, Hong-fei [1 ]
机构
[1] Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100190, Peoples R China
关键词
electrolytes; hydrogen bonds; interface phenomena; ion-molecule collisions; positive ions; potassium; sodium; vibrational states; water; SUM-FREQUENCY GENERATION; AIR-LIQUID INTERFACES; VIBRATIONAL SPECTROSCOPY; AIR/WATER INTERFACE; SALT-SOLUTIONS; 2ND-HARMONIC GENERATION; ORIENTED THIOCYANATE; IONS; SIMULATIONS; ORIENTATION;
D O I
10.1063/1.3104610
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
Sum frequency generation vibrational spectra of the water molecules at the NaF and KF aqueous solution surfaces showed significantly different spectral features and different concentration dependence. This result is the first direct observation of the cation effects of the simple alkali cations, which have been believed to be depleted from the aqueous surface, on the hydrogen bonding structure of the water molecules at the electrolyte solution surfaces. These observations may provide important clues to understand the fundamental phenomenon of ions at the air/water interface.
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页数:6
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