Electron spectroscopies of 3-hydroxyflavone and 7-hydroxyflavone in MCM-41 silica nanoparticles and in acetonitrile solutions. Experimental data and DFT/TD-DFT calculations

The data presented here concern the photophysical characterization of luminescent MCM-41 nanoparticles doped with 3-hydroxyflavone and 7-hydroxyflavone, two fluorescent flavonoids. UV-Vis and fluorescence spectra obtained on freshly-prepared samples and aged (2 months exposed to air) samples are shown. The effect of light exposure is also studied. In parallel, experiments have been carried out in acetonitrile solutions of the two flavonoids as a term of comparison. Time-dependent density functional theory calculations have also been used to simulate UV-Vis and emission spectra of different species for both flavonoids (neutral molecule, tautomers, cationic and anionic forms), taking into account the effect of the surrounding medium (solvent). Density functional theory calculations of vibrational spectra (IR, Raman) of neutral and tautomeric species of 3HF and 7HF are also provided. (C) 2021 The Authors. Published by Elsevier Inc.

Automated summary

The study focuses on the photophysical characterization of luminescent MCM-41 nanoparticles doped with two fluorescent flavonoids. Both UV-Vis and fluorescence spectra were analyzed on freshly-prepared and aged samples, with the effects of light exposure studied. Density functional theory calculations were used to simulate UV-Vis and emission spectra of the flavonoids, while vibrational spectra calculations were also provided.