Symmetry and Rigidity for Boosting Erbium‐Based Molecular Light‐Upconversion in Solution
Résumé
Abstract Previously limited to highly symmetrical homoleptic triple‐helical complexes [Er( Lk ) 3 ] 3+ , where Lk are polyaromatic tridentate ligands, single‐center molecular‐based upconversion using linear optics and exploiting the excited‐state absorption mechanism (ESA) greatly benefits from the design of stable and low‐symmetrical [ Lk Er(hfa) 3 ] heteroleptic adducts (hfa − =hexafluoroacetylacetonate anion). Depending on (i) the extended π‐electron delocalization, (ii) the flexibility and (iii) the heavy atom effect brought by the bound ligand Lk , the near‐infrared (801 nm) to visible green (542 nm) upconversion quantum yield measured for [ Lk Er(hfa) 3 ] in solution at room temperature can be boosted by up to three orders of magnitude.
Domaines
Chimie
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| Origine | Fichiers produits par l'(les) auteur(s) |
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| Origine | Fichiers produits par l'(les) auteur(s) |
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