Electronic and infrared vibrational analysis of cyanidin-quercetin copigment complex

Infrared spectra revealed the existence of hydrogen bonds in the copigment complexes structures. The analysis of the deconvoluted infrared spectra indicated several types of hydrogen bonds, differently formed: the HO⋯H bonds with the corresponding bands around 3500 cm−1 and bonds formed via H3O+, oxonium, ion of the molecules with the corresponding bands below 3000 cm−1.