Spectroscopic features of caffeic acid: Theoretical study

Abstract

In order to investigate spectroscopic features of caffeic acid (CA), the IR, Raman, 13C-NMR, 1H-NMR, and UV spectra of this compound were simulated. For this purpose the B3LYP-D3/6-311+G(d,p) theoretical model was used in combination with CPCM solvation model. Very good agreement between all experimental and simulated spectra was achieved. This result indicates that B3LYP-D3 can be a method of choice in studies that refer to spectroscopic investigations. Spectroscopic features of CA are very similar to those of chlorogenic acid (5-O-caffeoylquinic acid) (MARKOVIĆ, TOŠOVIĆ and DIMITRIĆ MARKOVIĆ, 2016), pointing out the significance of caffeic moiety.

Keywords

• caffeic acid
• vibrational spectra
• NMR spectra
• UV spectrum
• DFT calculations