Table 5 A selection of cations commonly used for ionic liquids

[Hmim]

1-Methylimidazolium

[132]

[C₄-py]

1-Butyl-pyridinium

[133, 134]

[Bmim]

1-Butyl-3-methylimiazolium

[127, 132]

[Emim]

1-Ethyl-3-methylimidazolium

[127, 134]

[Mmim]

1,3-Dimethylimidazolium

[135]

[Pdmim]

1-Propyl-2,3-dimethylimidazolium

[136]

[Hexpy]

1-Hexylpyridinium

[134]

[Bmpyr]

1-Butyl-3-methyl pyridinium

[137]

[Hmpyr]

1-Hexyl-3methyl pyridinium

[137]

[Amim]

1-Allyl-3-methylimdazolium

[127]

[C_npyr]

1-Alkylpyridinium

[138]

[mDBN]

5-Methyl-1,5-diazabicyclo[4.3.0]-non-5-enium

[139]

[DBNH]

1,5-Diazabicyclo[4.3.0] non-5-enium

[139]