Intramolecular energy transfer and its influence on the overall quantum yields of Eu 3+ and Tb 3+ chelates with dimethyl(phenylsulfonyl)amidophosphate ligands.

Autor: Carneiro Neto AN; Phantom-g, CICECO-Aveiro Institute of Materials, Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal. Electronic address: albanoneto@ua.pt., Nasalska J; Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie Str., 50-383 Wroclaw, Poland., Gawryszewska P; Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie Str., 50-383 Wroclaw, Poland., Trush VA; Department of Chemistry, Kyiv National Taras Shevchenko University, Volodymyrska str. 64, Kyiv 01601, Ukraine., Sokolnicki J; Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie Str., 50-383 Wroclaw, Poland., Malta OL; Department of Fundamental Chemistry, Federal University of Pernambuco, Recife, Pernambuco, Brazil. Electronic address: oscar.malta@ufpe.br., Legendziewicz J; Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie Str., 50-383 Wroclaw, Poland. Electronic address: janina.legendziewicz@uwr.edu.pl.
Jazyk: angličtina
Zdroj: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2025 Jan 05; Vol. 324, pp. 124875. Date of Electronic Publication: 2024 Jul 31.
DOI: 10.1016/j.saa.2024.124875
Abstrakt: Lanthanide chelates with dimethyl(phenylsulfonyl)amidophosphate (labeled as HSP) and Lewis base ligands (bpy = 2,2;-bipyridine and phen = 1,10-phenanthroline) of formula Na[Ln(SP) 4 ] (1Ln), [Ln(SP) 3 bpy] (2Ln); [Ln(SP) 3 phen] (3Ln) (Ln = Eu 3+ , Gd 3+ , Tb 3+ and Lu 3+ ) were obtained and characterized by the X-ray, photoluminescence spectroscopy at 293 and 77 K as well as by intrinsic (Q Ln Ln ) and overall (Q Ln L ) luminescence quantum yields. These phosphors manifest a very strong emission after excitation in the UV range of the molecular singlet states (S 1 ) and two of them have very high Q Ln L values (Eu 3+ and Tb 3+ chelates of the type 2Ln and 3Ln). The dynamics of the excited states are discussed based on the intramolecular energy transfer theory, considering the dipole-dipole, the dipole-multipole and the exchange mechanisms. From the calculated energy transfer rates, a rate equation model was constructed and, thus, the theoretical Q Ln L can be obtained. A good correlation between the experimentally determined and theoretically calculated Q Ln L values was achieved, with the triplet state (T 1 ) playing a predominant role in the energy transfer process for Eu 3+ compounds, while the sensitization for Tb 3+ compounds is dominated by the energy transfer rates from the singlet state (S 1 ).
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier B.V.)
Databáze: MEDLINE
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