No Ice-Like Water at Aqueous Biological Interfaces
No Ice-Like Water at Aqueous Biological Interfaces
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DOI：
10.1007/s13758-012-0020-3
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发表时间：
2012-12-01
期刊：
影响因子：
2.1
通讯作者：
Backus, Ellen H. G.
中科院分区：
文献类型：
--
作者：
Bonn, Mischa;Bakker, Huib J.;Backus, Ellen H. G.
水在生物界面处的表面振动光谱通常被解释为具有“冰状”和“液体状”成分。在这里，我们表明，在水-脂质和水-蛋白质界面的水的振动光谱大大简化H/D同位素稀释，这是不一致的存在下的“冰状”结构。作为同位素含量的函数的光谱中的变化可以通过水分子的弯曲和拉伸振动之间的分子内耦合来解释。
The surface vibrational spectrum of water at biological interfaces is often interpreted as having 'ice-like' and 'liquid-like' components. Here we show that the vibrational spectrum of water at both water-lipid and water-protein interfaces greatly simplifies upon H/D isotopic dilution, which is inconsistent with the presence of 'ice-like' structures. The changes in the spectra as a function of isotope content can be explained by intramolecular coupling between bend and stretch vibrations of the water molecules.