Hydration structure of trimethylamine N-oxide in aqueous solutions revealed by soft X-ray emission spectroscopy and chemometric analysis
Physical Chemistry Chemical Physics Volume 18 Issue 39
Page 27648-27653
published_at 2016-10-21
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Title ( eng ) |
Hydration structure of trimethylamine N-oxide in aqueous solutions revealed by soft X-ray emission spectroscopy and chemometric analysis
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Creator |
Sasaki Yuu
Horikawa Yuka
Tokushima Takashi
Oura Masaki
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Source Title |
Physical Chemistry Chemical Physics
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Volume | 18 |
Issue | 39 |
Start Page | 27648 |
End Page | 27653 |
Abstract |
The hydration structure of trimethylamine N-oxide (TMAO) in aqueous solutions has been investigated by means of soft X-ray spectroscopy and chemometric analysis. Soft X-ray absorption spectra in the O 1s region have a concentration-dependent shoulder at 533 eV, which is assigned to the 6a1 resonance of TMAO. Soft X-ray emission spectra acquired at this resonance comprise both TMAO and water components, with a prominent peak at 525.6 eV which is assigned to the emission caused by the 5e to O 1s transition. An apparent inverse concentration dependence of around 523 eV suggests that the electronic structure of water is modified by the strong interaction with TMAO. Such an effect has been included in the quantitative spectral analysis, called the classical least squares regression method, to obtain information on the hydration structure of the system. The analysis indicates that nine or more water molecules interact with a TMAO molecule. The present method offers a useful technique for probing the solvation structure around the solute which interacts strongly with the solvent.
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NDC |
Chemistry [ 430 ]
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Language |
eng
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Resource Type | journal article |
Publisher |
Royal Society of Chemistry
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Date of Issued | 2016-10-21 |
Rights |
Copyright (c) the Owner Societies 2016
Open Access Article. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
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Publish Type | Version of Record |
Access Rights | open access |
Source Identifier |
[ISSN] 1463-9076
[DOI] 10.1039/C6CP03750J
[DOI] http://doi.org/10.1039/C6CP03750J
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