125471.fig.004a
(a)
125471.fig.004b
(b)
Figure 4: The 𝜈 O H bands in the IR spectra of polycrystalline samples of (a) 2-furanacetic acid and (b) 2-furanacrylic acid, dispersed in KBr pellets. Temperature effect in the spectra. The Raman spectra measured for polycrystalline samples of the compounds at room temperature are also shown.