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July 1, 2026
Scientists Discover Why Europium 'Misbehaves'
Europium is a rare-earth metal responsible for the pure red glow in displays and other luminescent materials. For a long time, however, it refused to emit light when surrounded by certain organic molecules known as acylpyrazolone ligands. Chemists have now uncovered the reason: in europium complexes with these ligands, a 'black window' appears—a charge-transfer state in which the energy absorbed by the ligand is dissipated as heat rather than emitted as light. Understanding this mechanism opens the way to designing more efficient red-emitting materials for displays, fluorescent thermometers, and chemical sensors. The results have been published in Dalton Transactions.
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June 25, 2026
HSE Researchers Make Aldehydes Perform Dual Function
Chemists from HSE University have discovered a way to carry out a reductive addition reaction without using an external reducing agent. Instead, the required 'resource' is supplied by the aldehyde itself, one of the reaction participants. This approach helps prevent unwanted side reactions, reduces toxicity, and simplifies the production and synthesis of organic molecules, including those used in the manufacture of medicines. The study has been published in Journal of Catalysis.

 

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Luminescent lanthanide-based sensor for H2O detection in aprotic solvents and D2O

IEEE Sensors Journal. 2019. Vol. 19. No. 17. P. 7365–7372.
Gontcharenko V., Lunev A. M., Taydakov I., Korshunov V., Drozdov A., Belousov Y.

Applied methods for detecting water impurities in organic solvents, such as Fischer titration, include wayward equipment and toxic reagents. This method is inapplicable for detecting H2O in D2O, but suitable techniques like NMR-, IR-, and mass-spectrometry are costly. We report a low-cost, novel luminescent sensor material based on terbium-europium 3D MOF compound developed for facile, portable, and disposable monitoring of water quantities. Our sensor is able to determine water traces in D2O and aprotic organic solvents. Treating the material to solvent leads to the change in intensities ratio of terbium and europium bands in emission spectra depending of water content and nature of solvent. For D2O calibrating plot IEu/ITb – %H2O is linear whereas for dioxane and acetonitrile the dependence becomes linear in the coordinates IEu/ITb - ln(%H2O). The results reveal the potential application of developed sensor for ratiometric quantitation of H2O admixtures in D2O, organic solvents, transformer oil, etc.

Research target: Physics Chemistry
Language: English
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Keywords: sensorlanthanideMOF
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