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. 2022 Jul 29;7(31):27560–27572. doi: 10.1021/acsomega.2c03025

Table 1. Some Indicative C–H and C=C Stretch Frequencies of the UAS Cations.

cation anion phase CH stretch of CH3 group C=C stretch
I/II CH3−C+=CH−CH3 {Cl11−} crystal 2960 2928 2892 1537 1510 1490a
  CH3−C+=CH−CH3 {Cl11−} amorphous 2970 2929 2878 1537    
III CH3−C+=CH−CH3 {F11−} crystal 2960 2922 2877 1541 1513 1493
i-butylene15 (CH3)2C=CH+ {Cl11−} crystal 2960 2930 2874 1506 1485  
a

The intense band belonging to the main cation is underlined.