Control of 4f complexes luminescence with organic photochromic units
Lanthanide complexes are of particular interest due to their unique photophysical properties, including long-lived excited states and narrow bandwidth emission bands. The ability to select the appropriate lanthanide ion for the required emission wavelength, ranging from the visible to the near-infrared spectral range (NIR), makes them highly versatile tools in various applications, including anticounterfeiting, bioimaging, and information encryption.
The pioneering combination of an organic photochrome with emissive lanthanide(III) ions1 demonstrated that the optical response of a diarylethene (DAE) moiety can be tailored through isomerisation, providing a means to modulate europium(III) emission with light and to advance further the above mentioned applications.2
Our group is specialised in the photoswitching of NIR emitters and we have achieved both good contrast between the ON and OFF states and good fatiguability with various ytterbium(III) complexes.3 We have also recently developed systems with spontaneous return to the ON state.4 In this presentation, I will show the properties of various photoswitchable red or NIR emitting complexes and discuss their photophysics.
[1] Tetsuya, N.; Kazuhiko, A.; Takuya, N.; Yasuchika, H.; Tsuyoshi, K., Chem. Lett. 2007, 36, 372-3.
[2] Fréroux, Y.; Caussin, L.; El Beyrouti, N.; Rigaut, S.; Norel, L., Chapter 338 – Control of 4f complexes luminescence and magnetism with organic photochromic units. In Handbook on the Physics and Chemistry of Rare Earths, Bünzli, J.-C. G.; Kauzlarich, S. M., Eds. Elsevier: 2024; Vol. 65, 35-91.
[3] (a) Selvanathan, P.; Tufenkjian, E.; Galangau, O.; Roisnel, T.; Riobé, F.; Maury, O.; Norel, L.; Rigaut, S., Inorg. Chem. 2023, 62, 2049-57. (b) Al Sabea, H.; Hamon, N.; Galangau, O.; Norel, L.; Maury, O.; Riobé, F.; Tripier, R.; Rigaut, S., Inorg. Chem. Front. 2020, 7, 2979-89. (c) Al Sabea, H.; Norel, L.; Galangau, O.; Roisnel, T.; Maury, O.; Riobé, F.; Rigaut, S., Adv. Funct. Mater. 2020, 2002943.
[4] Norel, L.; Bernot, K.; Gendron, F.; Gould, C. A.; Roisnel, T.; Delbaere, S.; Le Guennic, B.; Jacquemin, D.; Rigaut, S., Chemistry Squared 2020, 4, 2.
