3-methyl-1-octyl-1H-imidazol-3-ium (M8OI) was purchased from Sigma (Poole, UK). 1-(7-carboxyheptyl)-3-methyl-1H-imidazol-3-ium (COOH7IM) was custom synthesized with purity and chemical structures determined by HPLC, mass spectrometry and NMR techniques (Probert et al., 2018 (link)). 1-(8-hydroxyoctyl)-3-methyl-imidazolium (HO8IM) was also custom synthesised, with chemical structure confirmed (see Supplementary Fig. 1).
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