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Raman and Ab Initio Studies of Simple and Binary 1-alkyl-3-methylimidazolium Ionic Liquids

Raman and Ab Initio Studies of Simple and Binary 1-alkyl-3-methylimidazolium Ionic Liquids

Rolf W Berg, Maggel Deetlefs, Kenneth R Seddon, Irene Shim, Jillian M Thompson

J Phys Chem B. 2005 Oct 13;109(40):19018-25.

PMID: 16853448

Abstract:

Raman spectra of the ionic liquids, 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim][PF6]), 1-hexyl-3-methylimidazolium chloride ([C6mim]Cl), and 1-hexyl-3-methylimidazolium hexafluorophosphate ([C6mim][PF6]), and binary mixtures thereof, have been assigned using ab initio MP2 calculations. The previously reported anti and gauche forms of the [C4mim]+ cation have been observed, and this study reveals this to be a general feature of the long-chain 1-alkyl derivatives. Analysis of mixtures of [C6mim]Cl and [C6mim][PF6] has provided information on the nature of the hydrogen bonding between the imidazolium headgroup and the anions, and the invariance of the essentially 50:50 mixture of the predominant conformers informs on the nature of glass formation in these systems.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP304680351	1-Hexyl-3-methylimidazolium hexafluorophosphate		304680-35-1	Price

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