Influence of Water on the Surface of Hydrophilic and Hydrophobic Room-Temperature Ionic Liquids

Vibrational spectroscopy, sum frequency generation, has been used to study the gas−liquid interface of imidazolium-based, room-temperature ionic liquids. The ionic liquids are divided into two categories on the basis of their miscibility with water, as hydrophobic (immiscible) and hydrophilic (misci...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Chemical Society 2004-09, Vol.126 (38), p.11788-11789
Main Authors: Rivera-Rubero, Selimar, Baldelli, Steven
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Gas-liquid interface and liquid-liquid interface
General and physical chemistry
Surface physical chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Vibrational spectroscopy, sum frequency generation, has been used to study the gas−liquid interface of imidazolium-based, room-temperature ionic liquids. The ionic liquids are divided into two categories on the basis of their miscibility with water, as hydrophobic (immiscible) and hydrophilic (miscible). The spectroscopy results indicate that water will reorient the cations of the hydrophobic ionic liquid, while in the hydrophilic ones they remain unaffected. Thus, under low water conditions the plane of the imidazolium ring remains parallel to the surface for both types of ionic liquid. However, at high water content the ring will reorient to along the surface normal for the hydrophobic ionic liquid but remain parallel to the surface for the hydrophilic one. This is a reversible process.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja0464894