Hydrogen bonding strength of interfacial water determined with surface sum-frequency generation

被引:137
作者
Sovago, Maria [1 ]
Campen, R. Kramer [1 ]
Bakker, Huib J. [1 ]
Bonn, Mischa [1 ]
机构
[1] AMOLF, Inst Atom & Mol Phys, FOM, NL-1098 SJ Amsterdam, Netherlands
关键词
VIBRATIONAL SPECTROSCOPY; MOLECULAR-STRUCTURE; THEORETICAL-ANALYSIS; FERMI RESONANCE; SOLVATION; SPECTRUM; SIMULATIONS; ORIENTATION; RELAXATION; DEPENDENCE;
D O I
10.1016/j.cplett.2009.01.009
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 demonstrate that marked variations exist in hydrogen bonding interactions of interfacial water at different aqueous interfaces. The average hydrogen bond strength and its distribution are inferred from surface sum-frequency generation (SFG) spectra through the center frequency and width, respectively, of the O-D stretch vibration of isotopically diluted HDO in H2O. The use of partially deuterated water prevents complications due to intramolecular vibrational coupling, which we show gives rise to features in the SFG spectra that are unrelated to hydrogen bonding interactions. At the water-air interface, the SFG spectrum in the hydrogen-bonded region strongly resembles the bulk Raman spectrum, indicating that, at this interface, the interfacial hydrogen bonding properties are very similar to those in bulk water. In contrast, for silica-water and lipid-water interfaces, interfacial hydrogen bonding is substantially stronger, with a larger degree of heterogeneity. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:7 / 12
页数:6
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