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Efficient Sensitized Luminescence of Binuclear Ln(III) Complexes Based on a Chelating Bis-Carbacylamidophosphate

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Abstract

Binuclear rare earth complexes Ln2L3phen2 (LnIII = NdIII, SmIII, EuIII, TbIII, DyIII, YbIII and YIII) with bis-CAPh type ligand - tetramethyl N,N′-(2,2,3,3,4,4-hexafluoro-1,5-dioxopentane-1,5-diyl)bis(phosphoramidate) (H2L) and 1,10-phenanthroline (phen) were synthesized and characterized by elemental analysis, IR, NMR, absorption and luminescence spectroscopy. Luminescence measurements were performed for all the complexes in solid state and for the EuIII, TbIII and YIII complexes - in solution in DMSO as well. The effective energy transfer from organic ligands to LnIII ions strongly sensitizes the LnIII ions emission and under excitation by UV light, the complexes exhibited bright characteristic emission of lanthanide metal centers. It was found that the energy level of the ligands lowest triplet state in the complexes matches better to resonance level of EuIII rather than TbIII ion. Depending on temperature the emission decay times of solid europium and terbium complexes were in the range of 1.5–2.0 ms. In solid state at room temperature the EuIII complex possess intense luminescence with very high intrinsic quantum yield 91% and decay time equal 1.88 ms.

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Contributions

All the authors (O. Y. Horniichuk, N. S. Kariaka, S. S. Smola, N. V. Rusakova, V. O. Trush, T. Y. Sliva, V. M. Amirkhanov) made substantial contribution while preparing the manuscript.

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This work was supported by the Ministry of Education and Science of Ukraine (Project no. 19BF037–05).

The publication contains the results of studies conducted by President’s of Ukraine grant for competitive projects (Project no. 19BF037–06).

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  1. Inorganic Chemistry Department, Taras Shevchenko National University of Kyiv, 12, Lva Tolstogo St, Kyiv, 01601, Ukraine

    O. Y. Horniichuk, N. S. Kariaka, V. O. Trush, T. Y. Sliva & V. M. Amirkhanov

  2. Lanthanide chemistry department, A. V. Bogatsky Physicochemical Institute of National Academy of Sciences of Ukraine, 86 Lustdorfska doroga, Odesa, 65080, Ukraine

    S. S. Smola & N. V. Rusakova

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Horniichuk, O.Y., Kariaka, N.S., Smola, S.S. et al. Efficient Sensitized Luminescence of Binuclear Ln(III) Complexes Based on a Chelating Bis-Carbacylamidophosphate. J Fluoresc 31, 1029–1039 (2021). https://doi.org/10.1007/s10895-021-02733-0

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