Synthesis and evaluation of fluorescence spectra and mass spectra of some complexes formed by lanthanides with benzoate and 2,2'-dipyridine-N-oxide ligands
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https://doi.org/10.54939/1859-1043.j.mst.FEE.2024.243-248Keywords:
Lanthanide; Complex; Benzoate; 2;2’-dipyridine-N-oxide; Luminescence.Abstract
Three series of lanthanide (III) complexes coodinated with benzoate and 2,2’-dipyridine-N-oxide were subjected to mass spectrometric and emission spectra analysis. These complexes were synthesized with a synthetic yield of 85%. Mass spectroscopy findings show that the synthesized complexes are monomers, they are represented by the general formula of Ln(Ben)2(DipyrO)2(H2O)2 (Ln: Tb, Dy, Yb; Ben: Benzoate; DipyrO: 2,2’-dipyridine-N-oxide). The emission spectra of the Tb(Ben)2(DipyrO)2(H2O)2 display three bands arising from the 5D4 → 7F5 dominant transition located at 545 nm, the weaker 5D4 → 7F6, 5D4 → 7F4 transitions located at 490 and 587 nm, respectively. The luminescent spectra of the Dy(Ben)2(DipyrO)2(H2O)2 displayed two bands at 480 and 576 nm, arising from 4F9/2 → 6H15/2 and 4F9/2 → 6H11/2 transitions, respectively. The 5D4 → 7F5 emission lifetime in Tb(Ben)2(DipyrO)2(H2O)2 is t = 0,07609 ± 0,00804 ms. The 4F9/2 → 6H11/2 emission lifetime in Dy(Ben)2(DipyrO)2(H2O)2 is t = 0,06943 ± 0,00706 ms. The results of our study demonstrate that these complexes exhibit room-temperature photoluminescence.
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