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Reorientation dynamics in liquid alcohols from Raman spectroscopy
University of Science and Technology of China.
University of Science and Technology of China.
University of Science and Technology of China.
University of Science and Technology of China.
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2012 (English)In: Journal of Raman Spectroscopy, ISSN 0377-0486, E-ISSN 1097-4555, Vol. 43, 82-88 p.Article in journal (Refereed) Published
Abstract [en]

Polarized Raman spectroscopy has been employed to study the reorientational, or more specifically the translational relaxation dynamics, of alcohol molecules in pure liquids and aqueous solutions. It is found from the spectral width measurements that alcohol molecules in pure liquids have typically translational relaxation times on the order of picoseconds, following the order methanol < ethanol < i-propanol < n-propanol. Temperature-dependent measurements show that hydrogen-bonding (HB) and hydrophobic interactions control the translational motion. The hydrophobic interaction reduces the relaxation time more apparently in view of the –CH3 group than the skeleton motion. For alcohol–water mixtures, the increaseofwater concentration generally slows down the relaxation process in a non-monotonic behavior. However, the trend stops at a certain point and the motion of alcohol molecules becomes faster when the alcohol concentration further drops. Different mechanisms have been proposed to interpret these observations, which might be helpful to gain deeper insight into the HB networks of alcohols with water. Our study strongly illustrates that Raman spectroscopy can be applied to the study of fast translational motion of molecules in HB systems.

Place, publisher, year, edition, pages
2012. Vol. 43, 82-88 p.
National Category
Physical Chemistry
Research subject
SRA - E-Science (SeRC)
Identifiers
URN: urn:nbn:se:kth:diva-72976DOI: 10.1002/jrs.2997ISI: 000299631100013Scopus ID: 2-s2.0-84856415213OAI: oai:DiVA.org:kth-72976DiVA: diva2:488425
Funder
Swedish Research CouncilSwedish e‐Science Research Center
Note
QC 20120228Available from: 2012-02-01 Created: 2012-02-01 Last updated: 2017-12-08Bibliographically approved

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