Comparative vibrational study between two imidazolium zwitterionic ionic liquids by FTIR-ATR and Raman spectroscopies
Abstract
In this study, two imidazolium-based zwitterionic ionic liquids, 3-(1,3-diethyl-1H-imidazol-3-ium-4-yl)propanoate (ZIL2) and 3-(1,3-dipentyl-1H-imidazol-3-ium-4-yl)propanoate (ZIL5), were synthesized and characterized using FTIR/ATR and Raman spectroscopy to evaluate the influence of alkyl chain length on their structural and vibrational properties. FTIR-ATR analysis reveals similar overall spectral profiles, with subtle shifts in band positions and variations in intensity in the C–H stretching, Cdouble bondN stretching, and CH₂ bending regions. Raman spectroscopy highlights more pronounced differences between ZIL2 and ZIL5, particularly in the 1700–200 cm⁻¹ region, indicating the sensitivity of the imidazolium ring and C–N bonds to alkyl substitution. ZIL5 exhibits a higher degree of molecular ordering, as suggested by sharper C–H stretching bands around 2930 cm⁻¹ , narrower CH₂ bending bands near1465 and 1440 cm⁻¹ , and a more intense Cdouble bondC stretching band around 1605 cm⁻¹ compared with ZIL2. Deconvolution of the Raman and FTIR- ATR spectra using Lorentzian functions was employed to identify spectroscopic differentiation markers between ZIL2 and ZIL5.
Related
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BibTeX
@article{mimouni2026comparative,
title = {{Comparative vibrational study between two imidazolium zwitterionic ionic liquids by FTIR-ATR and Raman spectroscopies}},
author = {Amina Mimouni and Taqiyeddine Moumene and Mokhtaria Drissi and Mahfoud Mohamed and Serge Bresson and El-Habib Belarbi and Albert Nguyen van Nhien},
journal = {Next Materials},
year = {2026},
month = sep,
doi = {10.1016/j.nxmate.2026.103523},
url = {https://u-picardie.hal.science/hal-05766851v1},
note = {CC BY-NC 4.0},
}
RIS
TY - JOUR
TI - Comparative vibrational study between two imidazolium zwitterionic ionic liquids by FTIR-ATR and Raman spectroscopies
AU - Amina Mimouni
AU - Taqiyeddine Moumene
AU - Mokhtaria Drissi
AU - Mahfoud Mohamed
AU - Serge Bresson
AU - El-Habib Belarbi
AU - Albert Nguyen van Nhien
PY - 2026
DA - 2026/09/23
JO - Next Materials
DO - 10.1016/j.nxmate.2026.103523
UR - https://u-picardie.hal.science/hal-05766851v1
AB - In this study, two imidazolium-based zwitterionic ionic liquids, 3-(1,3-diethyl-1H-imidazol-3-ium-4-yl)propanoate (ZIL2) and 3-(1,3-dipentyl-1H-imidazol-3-ium-4-yl)propanoate (ZIL5), were synthesized and characterized using FTIR/ATR and Raman spectroscopy to evaluate the influence of alkyl chain length on their structural and vibrational properties. FTIR-ATR analysis reveals similar overall spectral profiles, with subtle shifts in band positions and variations in intensity in the C–H stretching, Cdouble bondN stretching, and CH₂ bending regions. Raman spectroscopy highlights more pronounced differences between ZIL2 and ZIL5, particularly in the 1700–200 cm⁻¹ region, indicating the sensitivity of the imidazolium ring and C–N bonds to alkyl substitution. ZIL5 exhibits a higher degree of molecular ordering, as suggested by sharper C–H stretching bands around 2930 cm⁻¹ , narrower CH₂ bending bands near1465 and 1440 cm⁻¹ , and a more intense Cdouble bondC stretching band around 1605 cm⁻¹ compared with ZIL2. Deconvolution of the Raman and FTIR- ATR spectra using Lorentzian functions was employed to identify spectroscopic differentiation markers between ZIL2 and ZIL5.
SN - 2949-8228
ER -