Abstract
The photophysical and photochemical properties of fingerprint reagent - 1,8-diazafluoren-9-one (DFO) - were studied using steady-state, time-resolved spectroscopic techniques and semiempirical quantum-chemical calculations. In order to understand how microenvironment influences the excited-state properties of DFO, fluorescence quantum yields, lifetimes and rate constants were determined. Spectroscopic studies and theoretical calculations indicate that the energy-level disposition of close-lying nπ* and ππ* states of DFO is significantly modified by solvent polarity. The multiple linear regression analyses proposed by Kamlet-Taft and Catalán reveal that DFO solvation is mainly determined by dipolar solute-solvent interactions, whereas the specific interactions play a less significant role. Finally, the difference in the ground and excited state dipole moments of investigated dye was obtained using solvatochromic shift methods based on the Onsager's description of general solute-solvent interactions.
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