Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Towards a photophysical model for 5-hydroxyflavone.

Juan Carlos del Valle1

  • 1Departamento de Química Física Aplicada, C-2-203, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain. juan.valle@uam.es

The Journal of Chemical Physics
|March 18, 2006
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Atom Addition Formation of Thionylimide (HNSO) on Interstellar Dust Grains: Chemical Routes Requiring Oxygen and Nitrogen Atom Surface Diffusion.

ACS earth & space chemistry·2026
Same author

Molecule 1-Methyl-5-nitroindoline Probes the Structural Change of Liquid Water with Temperature.

ACS omega·2019
Same author

Kasha's rule: a reappraisal.

Physical chemistry chemical physics : PCCP·2019
Same author

Steady-State Spectroscopy of the 2-(N-methylacetimidoyl)-1-naphthol Molecule.

Photochemistry and photobiology·2015
Same author

Michael Kasha: from photochemistry and flowers to spectroscopy and music.

Angewandte Chemie (International ed. in English)·2014
Same author

A spectroscopic rule from the solvatochromism of aromatic solutes in nonpolar solvents.

The journal of physical chemistry. B·2014

The photophysics of 5-hydroxyflavone (5HF) shows proton-transfer fluorescence in various solvents, contrary to previous reports. This molecule exhibits remarkable photostability due to efficient internal conversion processes.

Area of Science:

  • Photophysics
  • Molecular Spectroscopy
  • Quantum Chemistry

Background:

  • 5-hydroxyflavone (5HF) is a molecule with intriguing photophysical properties.
  • Previous studies have reported conflicting findings regarding its fluorescence behavior.

Purpose of the Study:

  • To revise and clarify the photophysics of 5-hydroxyflavone (5HF).
  • To investigate the proton-transfer fluorescence of 5HF in different solvent environments.
  • To determine the photostability of 5HF and elucidate the underlying mechanisms.

Main Methods:

  • Experimental spectroscopic measurements using xenon lamp excitation.
  • Solvent-dependent fluorescence studies at room temperature.
  • Theoretical calculations employing B3LYP density functional theory (DFT) and time-dependent DFT.

Related Experiment Videos

Main Results:

  • Proton-transfer fluorescence of 5HF was observed in cyclohexane, hexane, ethanol, ethyl ether, 2-methyl-2-propanol, and dimethylsulfoxide.
  • A single emission band centered around 700 nm was detected in the fluorescence spectra.
  • 5HF demonstrated high photostability with a low photoreaction quantum yield (10^-5-10^-6) in various solvents.
  • Internal conversion from the S1 state, a repulsive potential energy curve, and a small S1'-S0' energy gap contribute to photostability.
  • Theoretical calculations supported experimental findings and revealed an unusual singlet-triplet splitting.

Conclusions:

  • The photophysics of 5HF has been clarified, confirming proton-transfer fluorescence in multiple solvents.
  • 5HF exhibits exceptional photostability attributed to internal conversion and specific electronic state properties.
  • Computational methods validate the experimental observations and highlight unique electronic configurations in 5HF.