Related Experiment Video
Updated: Apr 19, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
Redox- and protonation-induced fluorescence switch in a new triphenylamine with six stable active or non-active forms
Cassandre Quinton1, Valérie Alain-Rizzo, Cécile Dumas-Verdes
1PPSM, CNRS UMR8531, ENS Cachan, 61 Avenue du Président Wilson, 94235 Cachan (France), Fax: (+33) 1-47402454.
Abstract:
The synthesis, photophysical and electrochemical properties as well as theoretical calculation studies of a newly designed triphenylamine derivative are described. This original compound displays one neutral form, three oxidized forms, and two protonated forms with distinct photophysical characteristics. The interplay of the emission with the protonation or the redox state (electrofluorochromism) has been explored and an on-off-on-off fluorescence switching was observed in the case of oxidation and an on-on-off fluorescence switching in the case of protonation.
More Related Videos
12:07Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET
Published on: October 9, 2021
06:08Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
Related Concept Videos
Variables Affecting Phosphorescence and Fluorescence
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Photoluminescence: Applications
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3