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• W2012164474 endingPage "549" @default.
• W2012164474 startingPage "534" @default.
• W2012164474 abstract "The scheme of energy levels previously proposed to describe dual excitation and emission associated to excited state intramolecular proton transfer (ESIPT) of some hydroxyanthraquinones (HAQ’s) has been made more quantitative in the present paper. The zero-point energy and the frequency of the νOH mode for the HAQ’s have been calculated on the basis of the Lippincott–Schroeder double-minimum potential for the O–H⋯O hydrogen bond. The second derivative absorption (D2) spectra show that the vibrational structures of the electronic excited state of HAQ’s giving rise to ESIPT are characterized by the progression of the νOH stretching mode. The νOH mode in the ground state is observed as a very strong band in the vibrational structure of the short wavelength emission for HAQ’s showing ESIPT. The combined resonance Raman band assignment of four hydroxyanthraquinones and transform analysis show that the visible transition involves the hydrogen bonded cycle and induces proton transfer in the excited state in most cases. On the basis of the isotopic effects, some vibrations of the hydrogen bonded cycle, namely the νC=O, δC=O, νCOH, and δOH modes, have been identified. The transform method, including the combined analysis of the absorption and D2 spectra in terms of sum-over-states, was checked by directly deriving the displacement parameters (Franck–Condon factors) of 1,4-DHAQ from the high resolution free-jet spectrum. The values of the displacement parameters of the νOH mode are quite large for the HAQ’s showing ESIPT, while are negligible for 1,4-DHAQ. High values of the displacement parameters for the other vibrations of the hydrogen bonded cycle were found for all HAQ’s." @default.
• W2012164474 created "2016-06-24" @default.
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• W2012164474 date "1998-01-08" @default.
• W2012164474 modified "2023-10-14" @default.
• W2012164474 title "Intramolecular hydrogen bonding and excited state proton transfer in hydroxyanthraquinones as studied by electronic spectra, resonance Raman scattering, and transform analysis" @default.
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• W2012164474 doi "https://doi.org/10.1063/1.475417" @default.
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