VIBRATIONAL ANALYSIS OF HYDROXYFLAVYLIUM DERIVATIVES BY IR, FOURIER-TRANSFORM RAMAN AND RESONANCE RAMAN SPECTROSCOPIES

In order to give a better insight into the vibrational properties of a nthocyanins, the synthesis and the vibrational studies of some hydroxy flavylium derivatives with a controlled substitution pattern have been performed. The IR, Raman and resonance Raman spectra of the investiga ted hydroxyflavylium compounds have been recorded in the solid and sol ution states. A number of lines have been assigned on the basis of deu terium isotopic shifts. resonance enhancement and previous studies on parent compounds. An attempt has been made to analyze the influence of hydroxy substituents on vibrational properties of the investigated fl avylium cations.