. 2022 Aug 30;126(36):7006–7014. doi: 10.1021/acs.jpcb.2c02789

Table 1. Correlation between ¹H and ¹⁵N NMR Resonances with ΔpK_a of the PILs Studied or PA of the Corresponding Anion^a.

PIL	Δδ(¹H)^b (ppm)	Δδ(N2)^c (ppm)	ΔpK_a	anion PA (kcal/mol)
DBUH-TFO	6.81	100.6	20.4^d	305^e
DBUH-TFSI	5.80	101.8	23.4^d	294^e
DBUH-IM14	5.85	101.8	≃23.4	≃294

Standard uncertainties u are u(Δδ(¹H)) = 0.05 ppm; u(Δδ(N2)) = 0.1 ppm and u(T) = 0.1 K.

Δδ(¹H) = δH⁺– δCH₂(3) at 328 K.

Δδ(N2) = |δ(N2)_(cation) – δ(N2)_(free-base)| at T = 308 K.

Reference (14).

Reference (17).

Table 1. Correlation between 1H and 15N NMR Resonances with ΔpKa of the PILs Studied or PA of the Corresponding Aniona.