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. 2018 Sep 18;23(9):2380. doi: 10.3390/molecules23092380

Table 1.

A brief description of the working principles AILs employed, the targeted analytes and the sensitivity of detection.

Ionic Liquid Target Gas Species Sensing Mechanism Sensitivity of Detection Literature
AIL1 aldehydes; ketones imination ΔF = −1.0 Hz:
4.5 ppb 1; 148 ppb 2 		[110]
AIL2 aldehydes imination ΔF = −2.0 Hz:
4.6 ppb 3 		[111]
AIL3 acyclic and cyclic ketones hydrazone adduct formation ΔF = −1.0 Hz:
0.6 ppb 4 		[112]
AIL4 amines transamination ΔF = −1.0 Hz:
2.5 ppb 5 		[110]
AIL5 amines nucleophilic aromatic addition ΔF = 10 Hz:
8.0 ppb 6 		[113]
AIL6 amines nucleophilic aromatic addition ΔF = 10 Hz:
5.4 ppb 7 		[113]
AIL7 azides Huisgen 1,3-dipolar [3 + 2] cycloaddition ΔF = 10 Hz:
5 ppb 8; 35 ppb 9 		[114]
AIL8 control group inert inert [114]
AIL9 dienes Diels-Alder [4 + 2] cycloaddition N/A [115]
AIL10 dienes Diels-Alder [4 + 2] cycloaddition ΔF = −1 Hz:
1.5 ppb 10 		[115]
AIL11 CWA mimics nucleophilic substitution ΔF = 5 Hz:
20 ppb 11 		[116]

Sensitivity of detection with respect to 1 butyraldehyde; 2 2-butanone; 3 propionaldeyhyde; 4 cyclohexanone with 2 mol% Sc(OTf)3; 5 propylamine with 1 mol% Sc(OTf)3; 6,7 propylamine; 8 benzyl azide; 9 butyl azide; 10 cyclopentadiene; 11 diethyl chlorophosphate.