Vaporization Enthalpies of Imidazolium Based Ionic Liquids: Dependence on Alkyl Chain Length

✍ Scribed by Dr. Dzmitry H. Zaitsau; Prof. Dr. Sergey P. Verevkin; Dr. Vladimir N. Emel'yanenko; Prof. Dr. Andreas Heintz

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 227 KB
• Volume: 12
• Category: Article
• ISSN: 1439-4235
• DOI: 10.1002/cphc.201100618

✦ Synopsis

Abstract

Vaporization enthalpies of a series of ten 1‐alkyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl)imide ionic liquids (ILs) [C~n~mim][NTf~2~] with alkyl chain lengths of n=2, 3, 4, 6, 8, 10, 12, 14, 16, and 18 are determined by using a recently developed quartz crystal microbalance method. Due to the high sensitivity of the microbalance vapor studies can be extended to temperatures 60–100 K lower than those available with other methods. The results reveal a remarkably linear dependence of the vaporization enthalpies on the chain length at the reference temperature of 298 K.