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This article is cited in 1 scientific paper (total in 1 paper)
Spectroscopy of condensed matter
Luminescent properties of europium(III) compounds with quinolinic acid and phosphorus-containing neutral ligands
I. V. Kalinovskaya Institute of Chemistry, Far East Branch of the Russian Academy of Sciences, Vladivostok
Abstract:
Luminescent mixed-ligand europium(III) complexes with quinolinic acid and phosphorus-containing neutral ligands with a dimeric structure of the composition Eu$_{2}$(QA)$_{3}$ $\cdot$ 3Н$_{2}$О, Eu$_{2}$(QA)$_{3}$ $\cdot$ D $\cdot$ 2Н$_{2}$О, where QA is quinolinic acid and D is hmpa (hexamethylphosphortriamide), tppo (triphenylphosphinoxide), (hmpa), or Et$_{6}$pa (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$^{\circ}$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.
Keywords:
luminescence, europium compounds, quinolinic acid, luminescence excitation spectra.
Received: 15.11.2018 Revised: 15.11.2018 Accepted: 22.02.2019
Citation:
I. V. Kalinovskaya, “Luminescent properties of europium(III) compounds with quinolinic acid and phosphorus-containing neutral ligands”, Optics and Spectroscopy, 127:2 (2019), 231–235; Optics and Spectroscopy, 127:2 (2019), 231–235
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https://www.mathnet.ru/eng/os635 https://www.mathnet.ru/eng/os/v127/i2/p231
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