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Assignment of IR peaks.a
| Peak | Position [cm–1] |
| νas(CH3)ip | 2964 |
| νs(CH3)FR | 2937 |
| νas(CH2) | 2920 |
| νs(CH3)FR | 2877 |
| νs(CH2) | 2850 |
aνs and νas refer to the symmetric and antisymmetric stretching vibrations; ip refers to in-plane vibrations; FR indicates vibrations which are split because of Fermi resonance interactions with lower-frequency vibrations [33].
