Fig. 4: 1H-NMR chemical shifts are independent of 2Ala concentration.
From: Ion-specific binding of cations to the carboxylate and of anions to the amide of alanylalanine
a 1H-NMR spectrum of 0.25 M 2Ala (in H2O (DMSO-d5h1 capillary included). Proton signals are assigned to 2Ala’s protons as indicated in the structure shown in (b). The variation of the chemical shifts \({\delta }_{{{{{{\rm{rel}}}}}}}=\delta \left({c}_{2{{{{{\rm{Ala}}}}}}}\right)-\delta \left({c}_{2{{{{{\rm{Ala}}}}}}}=50\,{{{{{\rm{mM}}}}}}\right)\) as function of 2Ala concentrations is shown in (c). The solid red-line in (c) corresponds to \({\delta }_{{{{{{\rm{rel}}}}}}}=0\). Error bars show the typical experimental reproducibility of ±0.005 ppm (see the text).
