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. 2023 Oct 9;127(41):8916–8925. doi: 10.1021/acs.jpcb.3c05152

Figure 2.

Figure 2

C–D band of [EMIM][FAP] at 2365 cm–1 (top), which splits upon adding DMSO (middle) and red-shifts by >60 cm–1 (bottom) to a single peak. The dilution percentage is approximate. The green arrow shows the approximate location of the hidden peak B, which was later revealed by 2DIR spectroscopy.