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Comparative study between 1-Propyl-3-methylimidazolium bromide and trimethylene bis-methylimidazolium bromide ionic liquids by FTIR/ATR and FT-RAMAN spectroscopies

Abstract : In this study, we synthesized two ionic liquids based on imidazolium: one is a monocationic and the other is a dicationic. They are respectively 1-Propyl-3-methylimidazolium bromide ([PrMIM+][Br−]) and trimethylene bis-methylimidazolium bromide ([M(CH2)3IM2+][2Br−]). The structures of these two ionic liquids which are composed of ions with atoms of the same nature were first identified by 1H,13C NMR, and then compared in a study by FT-RAMAN and FTIR/ATR spectroscopies. FT-RAMAN spectras of the dicationic ionic liquid are richer in modes in the different spectral regions. Hence this richness seems to be a consequence of the passage from one to two rings in the imidazolium cation. In particular, the vibrational modes in the spectral ranges 700–600 cm−1, 1700–1500 cm−1 and 3200–2700 cm−1 by FTIR/ATR seem to be sensitive to the change from mono to dicationic than in FT-RAMAN. The spectral range in which the intermolecular interactions are present (200-50 cm−1) is a marker of differentiation between the mono and the dicationic. The spectral ranges on 1700–1200 cm−1 and 3200–2700 cm−1 also show signs of upheaval between our two samples. We can also notice that there are much more active modes in FT-RAMAN spectroscopy than in FTIR/ATR spectroscopy. © 2017 Elsevier B.V.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03695649
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Soumis le : mercredi 15 juin 2022 - 09:24:48
Dernière modification le : jeudi 16 juin 2022 - 03:07:14

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Mohamed Kadari, El Habib Belarbi, Taqiyeddine Moumene, Serge Bresson, Boumediene Haddad, et al.. Comparative study between 1-Propyl-3-methylimidazolium bromide and trimethylene bis-methylimidazolium bromide ionic liquids by FTIR/ATR and FT-RAMAN spectroscopies. Journal of Molecular Structure, Elsevier, 2017, 1143, pp.91-99. ⟨10.1016/j.molstruc.2017.04.076⟩. ⟨hal-03695649⟩

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