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. Author manuscript; available in PMC: 2013 Oct 18.
Published in final edited form as: J Phys Chem B. 2012 Oct 9;116(41):12473–12478. doi: 10.1021/jp307414s

Figure 5.

Figure 5

FTIR spectra of NMA in the amide I' region at 25.0 °C under different solvent conditions, as indicated. The concentrations of TMAO and 13C-urea were 4.7 and 5.1 M, respectively. Since the C=O stretching vibrational band of 12C-urea overlaps strongly with that of NMA, 13C-urea was used in the current case. The NMA concentrations were ~50 mM for the 13C-urea experiment and ~10 mM for other measurements. For easy comparison, the spectra obtained in TMAO and 13C-urea solutions have been normalized to that obtained in D2O.