171064 20260505142650.0 doi 10.1016/j.optmat.2026.118113 sideral 149152 ART-2026-149152 eng Maurin-Pasturel, Guillaume (orcid)0000-0003-4520-8772 Enhanced luminescence of (Eu3+/Sm3+)(diketone)3(N-Base) complexes enabled by ancillary ligands 2026 Lanthanide β-diketonate complexes are prominent luminescent materials due to their intense, spectrally pure emissions and their broad utility in sensing, display technologies, and photonics. Their efficiency, however, depends critically on the effectiveness of ligand-to-metal energy transfer and the suppression of non-radiative deactivation. Introducing ancillary N-donor ligands enhances these processes by improving energy-transfer efficiency and reducing vibrational quenching. We report a family of Eu3+ and Sm3+ complexes of general formula LnL3L*, where L is a β-diketonate (4,4,4- trifluoro-1-phenyl-1,3-butanedionate, btfa− , or 2-thenoyltrifluoroacetate, tta− ) and L* a bidentate (1,10-phenanthroline) or tridentate (terpyridine derivatives) N-donor ligand. The complexes were synthesized and characterized by single-crystal and powder X-ray diffraction, Raman, and IR spectroscopies. Photophysical measurements, supported by computational analysis, reveal clear structure–property correlations. All complexes exhibit markedly enhanced emission relative to the parent LnL3⋅2H2O species (Ln = Eu and Sm). The highest luminescence intensities were obtained with 4′(4-methyl)-2,2′:6′,2″-terpyridine, followed by 1,10-phenanthroline, 2,2′:6′,2″-terpyridine, and 2,6-bis(5-(p-methoxyphenyl)-1H-pyrazol-3-yl)pyridine. Overall, these results highlight the critical role of ancillary N-donor ligands in tuning lanthanide photophysics, thereby enabling enhanced emission efficiency and tailored optical properties for advanced luminescent technologies. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/DGA/E11-17R info:eu-repo/grantAgreement/ES/DGA/E17-23R info:eu-repo/grantAgreement/ES/DGA/LMP220_21 info:eu-repo/grantAgreement/ES/MICINN/PID2021-124354NB-I00 info:eu-repo/grantAgreement/ES/MICIU/RYC2024-048927-I info:eu-repo/semantics/embargoedAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Piñol, Rafael (orcid)0000-0001-7625-4806 Cases, Rafael Universidad de Zaragoza (orcid)0000-0002-9258-7907 Brites, Carlos D.S. Saraiva, Leonardo F. Carneiro Neto, Albano N. Ara, Irene Universidad de Zaragoza (orcid)0000-0002-5881-9698 Falvello, Larry (orcid)0000-0002-0444-996X Sanjuán, Marisa (orcid)0000-0002-5793-2058 Carlos, Luís D. Millán, Angel (orcid)0000-0003-0828-3212 2010 760 Universidad de Zaragoza Dpto. Química Inorgánica Área Química Inorgánica 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 176 (2026), 118113 [11 pp.] Opt. mater. Optical Materials 0925-3467 2024737 http://zaguan.unizar.es/record/171064/files/texto_completo.pdf Postprint info:eu-repo/date/embargoEnd/2028-04-16 1153937 http://zaguan.unizar.es/record/171064/files/texto_completo.jpg?subformat=icon icon Postprint info:eu-repo/date/embargoEnd/2028-04-16 oai:zaguan.unizar.es:171064 articulos driver 2026-05-05-13:36:55 ARTICLE