Article

No ice-like water at aqueous biological interfaces.

Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Biointerphases (impact factor: 2.21). 12/2012; 7(1-4):20. DOI:10.1007/s13758-012-0020-3
Source: PubMed

ABSTRACT 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.

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Keywords

'ice-like'
 
'ice-like' structures
 
'liquid-like' components
 
biological interfaces
 
H/D isotopic dilution
 
intramolecular coupling
 
spectra
 
stretch vibrations
 
surface vibrational spectrum
 
vibrational spectrum
 
water molecules
 
water-lipid
 
water-protein interfaces