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  1. Symmetry and Rigidity for Boosting Erbium-Based Molecular Light-Upconversion in Solution
    Soroush Naseri, Inès Taarit, Hélène Bolvin, Jean-Claude Bünzli, Alexandre Fürstenberg, Laure Guénée, Giau Le-Hoang, Mohsen Mirzakhani, Homayoun Nozary, Arnulf Rosspeintner, and Claude Piguet
    Angew. Chem. Int. Ed. 2023, 62(50), e202314503
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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 [LkEr(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 [LkEr(hfa)3] in solution at room temperature can be boosted by up to three orders of magnitude.

DOI: 10.1002/anie.202314503

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