Thermal and Luminescent Properties of Multi-Ligand Complexes of Europium(III) with Pyrazine-2-carboxylic Acid

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Resumo

Eu(III) compounds with pyrazine-2-carboxylic acid and nitrogen- and phosphorus-containing neutral ligands were synthesized. Using the methods of chemical elemental and thermal analysis and IR spectroscopy, the composition of the complexes and the method of coordination of carboxylate ions were established. The most thermally stable compounds have been identified. The luminescent characteristics of complex compounds have been studied. It was found that the maximum luminescence intensity is characteristic of europium(III) pyrazinate with triphenylphosphine oxide. The morphological structure and dispersion of the complexes were determined.

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Sobre autores

I. Kalinovskaya

Institute of Chemistry, Far-Eastern Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: kalinovskaya@ich.dvo.ru
ORCID ID: 0000-0001-6858-6595
Rússia, Vladivostok

A. Zadorozhnaya

Pacific State Medical University of the Ministry of Health of the Russian Federation

Email: kalinovskaya@ich.dvo.ru
ORCID ID: 0000-0002-1494-3769
Rússia, Vladivostok

V. Kuryavy

Institute of Chemistry, Far-Eastern Branch of the Russian Academy of Sciences

Email: kalinovskaya@ich.dvo.ru
Rússia, Vladivostok

L. Popov

Southern Federal University

Email: kalinovskaya@ich.dvo.ru
ORCID ID: 0000-0001-9565-8005
Rússia, Rostov-on-Don

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2. Fig. 1. Powder diffractograms of pyca (a), phen (b), Eu(pyca)3phen∙H2O (c), dipy (d), Eu(pyca)3(dipy)2(H2O)2 (e), tppo (f), Eu(pyca)3tppo∙H2O (g), dphg (h), Eu(pyca)3(dphg)2(H2O)2 (i)

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3. Fig. 2. Morphological structure of europium pyrazinates: Eu(pyca)3tppo∙H2O (a), Eu(pyca)3phen∙H2O (b), Eu(pyca)3(dipy)2(H2O)2 (c), Eu(pyca)3(dphg)2(H2O)2 (d)

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4. Fig. 3. Thermograms of europium(III) pyrazinates: Eu(pyca)3(H2O)2 (a), Eu(pyca)3(dipy)2(H2O)2 (b), Eu(pyca)3(dphg)2(H2O)2 (c), Eu(pyca)3tppo∙H2O (d)

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5. Fig. 4. IR spectra of samples: pyca (a), Eu(pyca)3tppo∙H2O (b), Eu(pyca)3(H2O)2 (c), Eu(pyca)3(dphg)2(H2O)2 (d), Eu(pyca)3phen∙H2O (e), Eu(pyca)3(dipy)2(H2O)2 (f)

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6. Fig. 5. Excitation spectra of luminescence (a) and luminescence (b): 1 - Eu(pyca)3phen∙H2O, 2 - Eu(pyca)3(H2O)2, 3 - Eu(pyca)3(dphg)2(H2O)2, 4 - Eu(pyca)3(dipy)2(H2O)2, 5 - Eu(pyca)3tppo∙H2O (293 K)

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