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νC=O of PAA-Val and PPAA-Val measured in CHCl3 and solid state a.
| Sample | Condition | Wavenumber (cm−1) | |
|---|---|---|---|
| νC=O (Amide) | νC=O (Ester) | ||
| PAA-Val | CHCl3 | 1662 | 1735 |
| solid | 1644 | 1734 | |
| PPAA-Val | CHCl3 | 1648 | 1735 |
| solid | 1644 | 1734 | |
a IR spectra were taken at room temperature in solution (20 mM) or in solid state.
