Four imidazolium-based ionic liquids (ILs) with two cations 1-pentyl-3-butylimidazolium [PBIM] and 1-benzyl-3-butylimidazolium tetrafluoroborate [BzBIM], and two anions tetrafluoroborate (BF) and trifluoromethanesulfonate (OTf) were synthesized for NH solubility enhancement. The structural, thermal, and electrochemical stabilities, ionic conductivity, and viscosity of the four ILs, namely, [PBIM]BF, [BzBIM]BF, [PBIM]OTf, and [BzBIM]OTf, were investigated. Due to the intermolecular interaction of the benzyl group attached to the imidazolium ring, [BzBIM]-based ILs exhibited higher thermal stability but lower ionic conductivity compared to [PBIM]-based ILs.
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