Structures and optical spectroscopy of lanthanide trifluoroacetates obtained from hexafluoroacetylacetone

Tsaryuk, V.I.; Vologzhanina, A.V.; Zhuravlev, K.P.; Kudryashova, V.A.

Авторы: Tsaryuk V.I., Vologzhanina A.V., Zhuravlev K.P., Kudryashova V.A.
Журнал: Journal of Fluorine Chemistry
Том: 197
Год издания: 2017
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 87
Последняя страница: 93
DOI: 10.1016/j.jfluchem.2017.03.009
Аннотация: Several lanthanide trifluoroacetate complexes with 2,20-bipyridine (Bpy) and 1,10-phenanthroline (Phen) prepared in an unusual method from hexafluoroacetylacetone (H-hfa) have been investigated using single crystal X-ray analysis, photoluminescence and IR spectroscopy. The triclinic crystal structures of [Ln(CF3CO2)3Bpy(H2O)3]Bpy (Ln = Eu (1), Tb (2)) contain outersphere Bpy molecules. The structure of the compound [Eu(CF3CO2)3Phen(H2O)3]Phen (3) is identical to 1 and 2 ones. A distorted square antiprismatic coordination geometry of the Ln3+ luminescence center, lifetimes of the 5D0 (Eu3+) and 5D4 (Tb3+) emitting states, luminescence efficiencies and energy transfer processes are discussed. Analysis of the relative energies of the lowest excited singlet and triplet states of the ligands and the electronic states of the Ln3+ ions showed that the most efficient luminescence excitation in the trifluoroacetates is realized through the auxiliary ligand. The results obtained were compared with available data for lanthanide acetates and b-diketonates. This study can be useful in the identification of lanthanide products synthesized from H-hfa, when the formation of mixtures of hexafluoroacetylacetonate and trifluoroacetate or the complete “replacement” of the final compound is a real problem.
Добавил в систему: Вологжанина Анна Владимировна

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Structures and optical spectroscopy of lanthanide trifluoroacetates obtained from hexafluoroacetylacetoneстатья

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