Solid state luminescence of phosphine-EWO ligands with fluorinated chalcone skeletons and their PdX2 complexes: metal-promoted phosphorescence enhancement
| Autor: | Jaime Ponce-de-León, Marconi N. Peñas-Defrutos, Andrea Vélez, Gabriel Aullón, Pablo Espinet |
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| Rok vydání: | 2023 |
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| Zdroj: | Dalton Transactions. 52:3265-3269 |
| ISSN: | 1477-9234 1477-9226 2017-0807 |
| DOI: | 10.1039/d3dt00408b |
| Popis: | Producción Científica Complexes trans-[PdX2L2] (X = Cl and Br), where L is 1-(PR2),2-(CH[double bond, length as m-dash]CH–C(O)Ph)-C6F4 (R = Ph, Cy, and iPr), display phosphorescent emission in the solid state, whereas due to their substantially lower lifetimes, the free ligands exhibit fluorescent behaviour. Alternatively, structurally identical derivatives with halide replaced by CN− or Pd replaced by Pt are non-emissive. DFT calculations explain this diverse behaviour, showing that the hybridization of orbitals of the MX2 moiety with those of the chalcone fragment of ligands is significant only for the LUMO of the emissive compounds. In other words, in our complexes, only MLMCT processes (LM = Metal-perturbed Ligand-centered orbital) lead to observable luminescence. Ministerio de Ciencia e Innovación (Projects PID2020-118547GB-I00 and PGC 2018-093863-B-C21) Ministerio de Ciencia e Innovación (FPI studentship: BES-2017-080726) Universidad de Valladolid. Margarita Salas postdoctoral fellowship (ref. CONVREC-2021-221). |
| Databáze: | OpenAIRE |
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