The properties of 4′-N,N-dimethylaminoflavonol in the ground and excited states

Content Provider	Semantic Scholar
Author	Moroz, V. V. Chalyi, Andrey G. Roshal, Alexander D.
Copyright Year	2008
Abstract	The mechanism of protonation of 4-N,N-dimethylaminoflavonol and the structure of its protolytic forms in the ground and excited states were studied by electron absorption and fluorescence (steady-state and time-resolved) spectroscopy and with the use of the RM1 quantum-chemical method. A comparison of equilibrium constants and the theoretical enthalpies of formation showed that excitation should be accompanied by the inversion of the basicity of the electron acceptor groups of this compound and, as a consequence, changes in the structure of its monocationic form. An analysis of the spectral parameters of the protolytic 4-N,N-dimethylaminoflavonol forms, however, showed that their structure and the sequence of protonation in the excited state were the same as in the ground state. Changes in the structure of the monocation in the excited state were not observed because of the fast radiationless deactivation of this form and the occurrence of excited state intramolecular proton transfer in aprotic solvents.
Starting Page	1464
Ending Page	1469
Page Count	6
File Format	PDF HTM / HTML
DOI	10.1134/S0036024408090100
Volume Number	82
Alternate Webpage(s)	http://rochal-home.univer.kharkov.ua/Papers/PCHA1464.pdf
Alternate Webpage(s)	https://doi.org/10.1134/S0036024408090100
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article