| Autor: |
Horniichuk OY; Inorganic Chemistry Department, Taras Shevchenko National University of Kyiv, 12, Lva Tolstogo St, Kyiv, 01601, Ukraine., Kariaka NS; Inorganic Chemistry Department, Taras Shevchenko National University of Kyiv, 12, Lva Tolstogo St, Kyiv, 01601, Ukraine. natalia_kariaka@i.ua., Smola SS; Lanthanide chemistry department, A. V. Bogatsky Physicochemical Institute of National Academy of Sciences of Ukraine, 86 Lustdorfska doroga, Odesa, 65080, Ukraine., Rusakova NV; Lanthanide chemistry department, A. V. Bogatsky Physicochemical Institute of National Academy of Sciences of Ukraine, 86 Lustdorfska doroga, Odesa, 65080, Ukraine., Trush VO; Inorganic Chemistry Department, Taras Shevchenko National University of Kyiv, 12, Lva Tolstogo St, Kyiv, 01601, Ukraine., Sliva TY; Inorganic Chemistry Department, Taras Shevchenko National University of Kyiv, 12, Lva Tolstogo St, Kyiv, 01601, Ukraine., Amirkhanov VM; Inorganic Chemistry Department, Taras Shevchenko National University of Kyiv, 12, Lva Tolstogo St, Kyiv, 01601, Ukraine. |
| Abstrakt: |
Binuclear rare earth complexes Ln 2 L 3 phen 2 (Ln III = Nd III , Sm III , Eu III , Tb III , Dy III , Yb III and Y III ) with bis-CAPh type ligand - tetramethyl N,N'-(2,2,3,3,4,4-hexafluoro-1,5-dioxopentane-1,5-diyl)bis(phosphoramidate) (H 2 L) 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 Eu III , Tb III and Y III complexes - in solution in DMSO as well. The effective energy transfer from organic ligands to Ln III ions strongly sensitizes the Ln III 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 Eu III rather than Tb III 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 Eu III complex possess intense luminescence with very high intrinsic quantum yield 91% and decay time equal 1.88 ms. |
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