학술논문
Vibrational Spectroscopic Study of Imidazolium Dicationic Ionic Liquids: Effect of Cation Alkyl Chain Length.
Document Type
Article
Author
Source
Subject
*IMIDAZOLES
*IONIC liquids
*VIBRATIONAL spectra
*RAMAN spectra
*CHAIN length (Chemistry)
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Language
ISSN
0021-9037
Abstract
Two new dicationic ionic liquids were synthesized: bis-methyl imidazolium methylidene hexafluorophosphate [M(CH)IM][2PF] and bis-methyl imidazolium propylidene hexafluorophosphate [M(CH)IM][2PF]. Their structures were identified by H, C, P, F NMR, FTIR/ATR, and FT-Raman spectroscopies in order to study the effect of cation alkyl chain length on vibration behaviors. Several changes were recorded, which were related to alkyl chain length. A frequency shift was observed in some modes while others remained insensitive. A greater number of peaks was found in the FTIR/ATR spectra and the FT-Raman spectra with increasing alkyl chain length, which indicated that chain length influences the N-C connection twisting. More peaks with strong intensity appeared for longer alkyl chain lengths. [ABSTRACT FROM AUTHOR]