[Zurück]

A.N. Gusev, M. Kiskin, I. Lutsenko, R. Svetogorov, S. Veber, O. Minakova, V. Korshunov, I. Taydakov, W. Linert:
"Triazole-based lanthanide(III) adducts: photo- and thermochromic luminescence";
Journal of Luminescence, 288 (2021), S. 118305 - 118314.

New series of Ln(III) adducts with triazole-based ligands has been synthesized and characterized as potential fluorescent emitters. The general formulas are Ln(C2H6O2)(H2O)2(NO3)3∙2bpt∙2H2O where Ln - Sm (1), Eu (2), Gd (3), Tb (4) and Dy (5); bpt - 3,5-bis(pyridine-4-yl)-1,2,4-triazole. The crystal structures of 2 and 4 were determined by single-crystal X-ray analysis. Luminescence studies have been carried out for the complexes in the solid-state phase. All luminescence spectra showed characteristic emission bands of lanthanide ions and broad band of ligand-centred emission that indicates about incomplete suppression of the ligand-centered fluorescence is observed. As a result, it leads to an inefficient ligand-to-metal energy transfer. Complexes of Tb(III) and Eu(III) ions demonstrate thermosensing properties based on dual emission as result of energy transfer between 3,5-bis(pyridine-4-yl)-1,2,4- triazole molecules and Ln(III) ions.

thermo-sensitive luminescence, lanthanide complexes, triazole

http://dx.doi.org/10.1016/j.jlumin.2021.118305