Role of solute-solvent hydrogen bonds on the ground state and the excited state proton transfer in 3-hydroxyflavone. A systematic spectrophotometric study

被引:31
作者
Lazzaroni, Simone [1 ,2 ]
Dondi, Daniele [1 ]
Mezzetti, Alberto [3 ]
Protti, Stefano [4 ]
机构
[1] Univ Pavia, Dept Chem, Radchem Lab, Via Taramelli 10, Pavia, Italy
[2] Univ Pavia, Lab Appl Nucl Energy, LENA, Via Aselli 41, I-27100 Pavia, Italy
[3] Sorbonne Univ, Lab Reactivite Surface UMR CNRS 7197, Fac Sci & Ingn, Tour 43-53,3eme Etage,4 Pl Jussieu, F-75005 Paris, France
[4] Univ Pavia, Dept Chem, PhotoGreen Lab, Via Taramelli 12, I-27100 Pavia, Italy
关键词
INSTANT SPECTRA; FLUORESCENCE; COMPLEXATION; FLAVONOLS; DYES; PHOTOOXYGENATION; SPECTROSCOPY; RECOGNITION; DYNAMICS; VALUES;
D O I
10.1039/c8pp00053k
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A detailed account on the photophysics of 3-hydroxyflavone (3HF) in 27 organic solvents is reported. Dual fluorescence of neutral 3HF was observed in protic, polar, and weakly polar solvents, endowed with sufficiently high hydrogen bond accepting and/or donating capabilities. Ground-state solvent-induced 3HF deprotonation was reported in 14 cases. 3HF anion photophysics was investigated, and the deprotonation constant K-dep calculated. Previously reported models (based on solute-solvent intermolecular hydrogen bonds) to explain solvent effects on Excited-State Intramolecular Proton Transfer (ESIPT) and on solvent-induced deprotonation have been re-examined and improved in order to rationalize the observed photophysical behaviour in all the studied solvents. Hydrogen bond donor acidity and hydrogen bond acceptor basicity are shown to be key parameters. The results are discussed in the framework of the use of 3HF as an environment-sensitive fluorescent sensor in several research fields, and as a model system in the study of ESIPT reactions. Solvent effects on 3HF reactivity are also discussed, as the role of the surrounding media on the chemistry of flavonols is an emerging topic in natural product research.
引用
收藏
页码:923 / 933
页数:11
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