Expanding the polarity range of ionic liquids

The polarity of several [X-mim]NTf2 ionic liquids. as measured with solvatochromic dyes. Reichardt's dye and Nile Red, may be varied over a wide range by attachment of functional group-containing substituents (X) to the imidazolium cation. (C) 2002 Elsevier Science Ltd. All rights reserved.