Luminescent europium(iii) and terbium(iii) complexes of beta-diketonate and substituted terpyridine ligands: synthesis, crystal structures and elucidation of energy transfer pathways

NEW JOURNAL OF CHEMISTRY

dc.creatorAbbas, Zafar
dc.creatorDasari, Srikanth
dc.creatorBeltrán-Leiva, María J
dc.creatorCantero-López, Plinio
dc.creatorPáez-Hernández, Dayán
dc.creatorArratia-Pérez, Ramiro
dc.creatorButcher, Ray J
dc.creatorPatra, Ashis K
dc.date2021-08-23T22:49:45Z
dc.date2022-07-08T20:23:19Z
dc.date2021-08-23T22:49:45Z
dc.date2022-07-08T20:23:19Z
dc.date2019
dc.date.accessioned2023-08-22T05:27:59Z
dc.date.available2023-08-22T05:27:59Z
dc.identifier1150629
dc.identifier1150629
dc.identifierhttps://hdl.handle.net/10533/250448
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8324250
dc.descriptionIn this work, we synthesized and structurally characterized a series of six coordinatively saturated Eu-III and Tb-III complexes: [Ln(R-TPY)(TTA)(3)] (1-6), having three beta-diketonate ligands i.e.TTA = 1,1,1-trifluoro-3-(2-theonyl)acetone, and one judiciously substituted terpyridine derivative (R-TPY), viz. [Eu(FTPY)(TTA)(3)] (1), [Tb(FTPY)(TTA)(3)] (2), [Eu(TTPY)(TTA)(3)] (3), [Tb(TTPY)(TTA)(3)] (4), [Eu(PTPY)(TTA)(3)] (5) and [Tb(PTPY)(TTA)(3)] (6), where FTPY = 4 '-(2-furyl)-2,2 ':6 ',2 ''-terpyridine, TTPY = 4 '-(2-thienyl)-2,2 ':6 ',2 ''-terpyridine, and PTPY = 4 '-(2-pyrolyl)-2,2 ':6 ',2 ''-terpyridine. The complexes were synthesized and structurally characterized by X-ray crystallography and various other physicochemical and spectroscopic methods to realize their optical properties and energy transfer pathways from dual antennae. The structural characterization of the complexes shows discrete nine-coordinated {LnN(3)O(6)} geometry originating from six oxygen donors of three monoanioninc beta-diketonate ligands and three nitrogens from a tridentate terpyridine derivative (R-TPY). We elucidate the energy transfer (ET) pathways from two coordinating antennae moieties (i.e.R-TPY and TTA) in these complexes using relativistic multiconfigurational methods. For this purpose, a theoretical analysis was performed through a method that consists of a fragmentation scheme, wherein all the constituent fragments (TTA, R-TPY and Ln(III)) were treated at the same level of theory. These calculations were based on scalar relativistic time-dependent density functional theory (SR-TDDFT) and the multireference complete active space self-consistent field (CASSCF/PT2) technique to construct the respective energy level diagrams and determine the most probable ET pathways. Possible pathways were elucidated from the optimum energy difference between the ligand-centered triplet (T-3) states and the emissive excited states of the Ln(III) fragments. These calculations and energy transfer pathways were in good agreement with the experimental photophysical data and explain the involvement of several parallel energy transfer pathways to varying extent in these luminescent Ln(III) complexes.
dc.descriptionRegular 2015
dc.descriptionFONDECYT
dc.descriptionFONDECYT
dc.languageeng
dc.relationhandle/10533/111557
dc.relationhandle/10533/111541
dc.relationhandle/10533/108045
dc.relationhttps://doi.org/10.1039/c9nj02838b
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.rightsinfo:eu-repo/semantics/article
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleLuminescent europium(iii) and terbium(iii) complexes of beta-diketonate and substituted terpyridine ligands: synthesis, crystal structures and elucidation of energy transfer pathways
dc.titleNEW JOURNAL OF CHEMISTRY
dc.typeArticulo
dc.typeinfo:eu-repo/semantics/publishedVersion


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