Varenikov, A.A.VarenikovSerdiuk, I.I.SerdiukRoshal, A.A.Roshal2026-04-162026-04-162014-11-13Varenikov, A., Serdiuk, I., Roshal, A. (2014). SPECTRAL AND BASIC PROPERTIES OF FLAVONES IN THE GROUND AND EXCITED STATES. Вісник Київського національного університету імені Тараса Шевченка. Хімія, 50(1), 70–73.https://ir.library.knu.ua/handle/15071834/16243Dependence between structures of R-oxyflavones and their spectral and basic properties has been investigated. It was found that pKa of flavones, depending on positions of hydroxy and methoxy groups, increase by 6-8 orders of magnitude upon excitation and reaches 3.7-6.6 units. Due to high pKa* value carbonyl group can serve as a proton acceptor in the excited-state intramolecular proton transfer as well as in the formation of phototautomers of 7- and 4'-hydroxyflavones in protic solvents.Dependence between structures of R-oxyflavones and their spectral and basic properties has been investigated. It was found that pKa of flavones, depending on positions of hydroxy and methoxy groups, increase by 6-8 orders of magnitude upon excitation and reaches 3.7-6.6 units. Due to high pKa* value carbonyl group can serve as a proton acceptor in the excited-state intramolecular proton transfer as well as in the formation of phototautomers of 7- and 4'-hydroxyflavones in protic solvents.enflavoneselectronic spectroscopyacid-base propertiesprotolytic equilibria-flavoneselectronic spectroscopyacid-base propertiesprotolytic equilibriaСтаття