New approach to increase the sensitivity of Tb–Eu-based luminescent thermometer

New approach to increase the sensitivity of the luminescent thermometry materials based on Tb-Eu complexes was proposed, namely the introduction of Gd resulting in the formation of trimetallic complexes.

How does the ligand affect the sensitivity of the luminescent thermometers based on Tb–Eu complexes

Theoretical description of a 4-level system for luminescent thermometry was proposed and verified. Equation to calculate the sensitivity was derived. For Tb–Eu complexes the ligand involvement can increase the sensitivity only if the ligand triplet state is above 26 800 cm−1.

Effect of Heterocyclic Ring on LnIII Coordination, Luminescence and Extraction of Diamides of 2,2′-Bipyridyl-6,6′-Dicarboxylic Acid

We have synthesized and examined several complexes of lanthanides with diamides of 2,2′-bipyridyl-6,6′-dicarboxylic acid bearing various hetaryl-based side chains for the elucidation of the effect of the heterocycle on the structure and properties of the ligands. The multigram scale methods for the preparation of various N-alkyl-hetaryls and their diamides were developed. The solid state structure of 6-methyl-2-pyridylamide of 2,2′-bipyridyl-6,6′-dicarboxylic acid possesses a flat structure where the conformation is completely different from that previously observed for N-alkylated 2,2′-bipyridyl-6,6′-dicarboxamides and 2,6-pyridinedicarboxamides. The complexes of new ligands were synthesized and NMR and X-Ray studied their structure in solution and solid state. The results demonstrate that complexes possess the same structures both in solid state and in solution. Stability constants of the complexes were less when comparing with dimethyl-substituted diamides, but higher than for unsubstituted dianilide. Contrarily, the extraction ability of 2-pyridyl-diamide is significantly lower than for corresponding anilide. Specific interaction of extractant with solvent molecules, which is not available for electron-sink pyridine amides, can explain this. The luminescence of new Eu complexes was significantly higher than for all previously 2,2′-bipyridyl-6,6′-dicarboxamides and QY reaches 18%. Asymmetry ratios of Eu complexes were 25% higher when compared other complexes with 2,2′-bipyridyl-6,6′-dicarboxamides, which indicates large deviation from the inversion center.

Synthesis of homoleptic, divalent lanthanide (Sm, Eu) complexes via oxidative transmetallation

Divalent samarium and europium complexes with bulky 3-coordinate bis(tris-tert-butoxysilyl)amides are synthesized through oxidative transmetallation.

Preparation and Characterization of Stable Molecular Glasses of Europium(III) Acyl-Alaninate Complexes

Working with acylaminocarboxylate ligands, we used ethanol and water as a solvent, and the europium complexes were prepared using a chemical reaction method in solution. The elements were analyzed and characterized by polarizing microscope and XRD, respectively. The surfaces of complexes in the solid state were observed by polarizing microscope morphology. XRD diffraction data confirms the periodic long range order/disorder structure of these europium complexes. We also found that diversified material was easily formed by the rare earth complexes. Using the above tests, the structural information of the Eu complexes in the glassy state, liquid crystal glassy state and crystalline states was obtained

Alkyl chain elongation and acyl group effects in a series of Eu/Tb complexes with hexadentate π-electronic skeletons and their enhanced luminescence in solutions

Enhanced luminescence and structural aspects of bpy-based Eu complexes with long alkyl chains and acyl groups were elucidated in solutions.

Phase controlled colour tuning of samarium and europium complexes and excellent photostability of their PVA encapsulated materials. Structural elucidation, photophysical parameters and the energy transfer mechanism in the Eu3+ complex by Sparkle/PM3 calculations

Luminescence and photostability of new Sm and Eu complexes and those of their thin hybrid films have been investigated and discussed.