Proton Transfer in Matrix-Isolated 3-Hydroxyflavone and 3-Hydroxyflavone Complexes

Article abstract of DOI:10.1021/j100295a040

The proton-transfer dynamics of 3-hydroxyflavone (3HF) and 3HF-solvent complexes have been studied in 10 K argon matrices.Both static and picosecond fluorescence spectroscopies were used.The results indicate that proton transfer in bare molecules occurs quite rapidly (<10 ps).The 3HF-solvent complexes are formed by codeposition of argon:solvent mixtures (typically 2000:1) with 3HF followed by matrix annealing.Solvents include water, methanol, ethanol, and diethyl ether.The results show that proton transfer is very fast (<10 ps) in alkohol and water monosolvates and can be interpreted in terms of cyclically hydrogen-bonded structures.The results also show that the diethyl ether monosolvate undergoes proton transfer in about 40 ps.Solvation with two or more waters or alkohols was found to inhibit proton transfer.