LAUSR.org creates dashboard-style pages of related content for over 1.5 million academic articles. Sign Up to like articles & get recommendations!

How mobile is the water in the reverse micelles? A 2DIR study with an ultrasmall IR probe

Photo by a2eorigins from unsplash

Abstract Water molecules in reverse micelle serve as an excellent model for biological water. However, it has been argued previously that water molecules at the centre, even for smaller sized… Click to show full abstract

Abstract Water molecules in reverse micelle serve as an excellent model for biological water. However, it has been argued previously that water molecules at the centre, even for smaller sized water pools of reverse micelles, behave like bulk water, using ultrafast vibrational lifetime measurements of azide ion. In the present investigation, the vibrational dynamics of an ultrasmall IR probe, azide ion, has been studied in AOT reverse micelle, at various w0 (radius of water pool), using linear IR measurements, vibrational lifetime measurements and 2D-IR measurements. While linear IR measurements shows gradual variation in spectral parameters, such as, peak position and width of the vibrational transition, suggesting a gradual change in the micro environment of the probe with variation in radius of the water pool, the vibrational lifetime remains indistinguishable with variation in w0, which has been ascribed earlier to the location of azide ion in the centre of the water pool. Herein, ultrafast 2D-IR spectroscopy convincingly demonstrates that, for a smaller sized water pool, the water molecules, even at the centre of the water pool, behave significantly different as compared to bulk water, an inference, which is missed by the previous vibrational lifetime measurements, and suggest an extensive slowdown of the hydrogen bond relaxation dynamics as compared to bulk water.

Keywords: probe; water; water pool; vibrational lifetime; reverse micelles

Journal Title: Journal of Molecular Liquids
Year Published: 2020

Link to full text (if available)


Share on Social Media:                               Sign Up to like & get
recommendations!

Related content

More Information              News              Social Media              Video              Recommended



                Click one of the above tabs to view related content.