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The excited state intramolecular proton transfer (ESIPT) dynamics of the 1-hydroxy-9H-fluoren-9-one (HHF) and 1-hydroxy-11H-benzo[b]fluoren-11-one (HHBF) chromophores were investigated theoretically. The calculated bond lengths and angles, hydrogen bond energies and infrared vibrational spectra involved in the hydrogen bonding of O–H···O indicated that the intramolecular hydrogen bond was strengthened...
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