Structural Peculiarities and Luminescence of Europium Dipivaloylmethanates with 2,2′-bipyridine Derivatives. Polymorphism of [Eu(DPM)3Bpy] Full article
Journal |
Inorganica Chimica Acta
ISSN: 0020-1693 , E-ISSN: 1873-3255 |
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Output data | Year: 2020, Volume: 502, Article number : 119294, Pages count : 8 DOI: 10.1016/j.ica.2019.119294 | ||||||||
Tags | 2,2′-Bipyridine; Dipivaloylmethanate; Eu3+; Luminescence; Tb3+; X-ray crystal structure | ||||||||
Authors |
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Affiliations |
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Funding (1)
1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2019-0003 |
Abstract:
A series of new dipivaloylmethanates of lanthanides with 2,2′-bipyridine [Ln(DPM)3Bpy] (Ln = Eu, Gd, Tb) and 4,4′-dimethylbipyridine [Ln(DPM)3DMBpy] (Ln = Eu, Tb) was synthesized and investigated using single-crystal X-ray diffraction and luminescence spectroscopy. Compounds with 4,4′-diphenylbipyridine [Ln(DPM)3DPhBpy] (Ln = Eu, Tb) as well as some lanthanide dipivaloylmethanates with Phen derivatives were also considered. The crystal structures of [Eu(DPM)3Bpy] and [Ln(DPM)3DMBpy] (Ln = Eu, Tb) belonging to the P1¯ space group of symmetry, and the structures of [Ln(DPM)3Bpy] (Ln = Eu, Gd, Tb) related to the Pna21 space group were determined. The polymorphism of [Eu(DPM)3Bpy] was revealed. It is shown that the orthorhombic polymorph can transform into triclinic. The display of polymorphism in the luminescence spectra is considered. The influence of distortions of the Ln3+ nearest surroundings introduced by the bulky ancillary ligand on the luminescence spectra, the relative intensity of the electric-dipole 5D0-7F2 transition of the Eu3+ ion, and the lifetimes of the Eu3+ and Tb3+ emitting states is analyzed. A qualitative correlation between the measured lifetimes and the intensity of the 5D0-7F2 transition was observed for the series of dipivaloylmethanates. The relative contributions of the pure radiative and non-radiative processes to the decay rate of the 5D0 state of the Eu3+ ion are discussed. A significant effect of non-radiative processes on the lifetime, first of all, due to high-frequency vibrations of the DPM ligand was demonstrated. © 2019 Elsevier B.V.
Cite:
Zhuravlev K.P.
, Tsaryuk V.I.
, Vologzhanina A.V.
, Dorovatovskii P.V.
, Zubavichus Y.V.
, Kudryashova V.A.
, Klemenkova Z.S.
Structural Peculiarities and Luminescence of Europium Dipivaloylmethanates with 2,2′-bipyridine Derivatives. Polymorphism of [Eu(DPM)3Bpy]
Inorganica Chimica Acta. 2020. V.502. 119294 :1-8. DOI: 10.1016/j.ica.2019.119294 WOS Scopus РИНЦ
Structural Peculiarities and Luminescence of Europium Dipivaloylmethanates with 2,2′-bipyridine Derivatives. Polymorphism of [Eu(DPM)3Bpy]
Inorganica Chimica Acta. 2020. V.502. 119294 :1-8. DOI: 10.1016/j.ica.2019.119294 WOS Scopus РИНЦ
Dates:
Submitted: | Sep 10, 2019 |
Accepted: | Nov 19, 2019 |
Published online: | Nov 22, 2019 |
Published print: | Mar 1, 2020 |
Identifiers:
Web of science | WOS:000510860900015 |
Scopus | 2-s2.0-85076052821 |
Elibrary | 43215651 |
Chemical Abstracts | 2019:2279890 |
OpenAlex | W2991236050 |