Open AccessЛюминесцентные свойства соединений европия(III) с хинолиновой кислотой и фосфорсодержащими нейтральными лигандами
Author(s) -
И. В. Калиновская
Publication year - 2019
Publication title -
žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-748X
pISSN - 0044-4642
DOI - 10.21883/os.2019.08.48034.332-18
Subject(s) - europium , chemistry , quinolinic acid , ligand (biochemistry) , carboxylate , luminescence , inorganic chemistry , ion , thermal decomposition , molecule , endothermic process , photochemistry , stereochemistry , organic chemistry , materials science , tryptophan , biochemistry , receptor , optoelectronics , amino acid , adsorption
Luminescent mixed-ligand europium(III) complexes with quinolinic acid and phosphorus-containing neutral ligands with a dimeric structure of the composition Eu_2(QA)_3 · 3Н_2О, Eu_2(QA)_3 · D · 2Н_2О, where QA is quinolinic acid and D is hmpa (hexamethylphosphortriamide), tppo (triphenylphosphinoxide), (hmpa), or Et_6pa (hexaethylphosphortriamide), are synthesized. The thermal and spectral-luminescent properties of the synthesized complex mixed-ligand europium(III) compounds are studied. It is shown that the detachment of water and neutral ligand molecules during thermolysis occurs in two stages with endothermic effects and that the complex compounds are stable at temperatures up to 320°С. It is found by IR spectroscopy that quinolinic acid coordinates to the europium(III) ion by two carboxylate ions. The low luminescence intensity of mixed-ligand europium(III) quinolinates is explained by inefficient electronic excitation energy transfer from quinolinic acid and phosphorus-containing neutral ligands to europium ions.