The synthesis, solution behavior and photophysical properties of several heteronuclear bimetallic d/f complexes that utilise a RuII bis-terpyridine moiety as the sensitiser for EuIII, NdIII and YbIII luminescence are reported and compared to a GdIII analogue. The former compounds display sensitised emission in the visible and near-infrared (NIR) regions depending on the choice of the LnIII cation. We illustrate that sensitised lanthanide emission can operate by two distinctly different pathways that involve either the triplet ligand-centred (3LC) excited state of the organic ligand or the triplet metal-to-ligand charge transfer (3MLCT) excited state of the RuII complex. Owing to the electronic structure of this antenna and the higher density of metal-centred accepting states, a higher sensitization efficiency with NdIII was observed than with YbIII and EuIII. Lastly, we have observed unusual sensitised emission from the upper (4F5/2, 2H9/2) excited state of NdIII at approximately 800 nm, which we report here for the first time from a molecular species in solution.

Moore, E.G., Benaglia, M., Bergamini, G., Ceroni, P. (2015). Synthesis, Stability and Sensitised Lanthanide Luminescence of Heterobimetallic d/f Terpyridine Complexes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 2015(3), 414-420 [10.1002/ejic.201403100].

Synthesis, Stability and Sensitised Lanthanide Luminescence of Heterobimetallic d/f Terpyridine Complexes

MOORE, EVAN GUY;BERGAMINI, GIACOMO;CERONI, PAOLA
2015

Abstract

The synthesis, solution behavior and photophysical properties of several heteronuclear bimetallic d/f complexes that utilise a RuII bis-terpyridine moiety as the sensitiser for EuIII, NdIII and YbIII luminescence are reported and compared to a GdIII analogue. The former compounds display sensitised emission in the visible and near-infrared (NIR) regions depending on the choice of the LnIII cation. We illustrate that sensitised lanthanide emission can operate by two distinctly different pathways that involve either the triplet ligand-centred (3LC) excited state of the organic ligand or the triplet metal-to-ligand charge transfer (3MLCT) excited state of the RuII complex. Owing to the electronic structure of this antenna and the higher density of metal-centred accepting states, a higher sensitization efficiency with NdIII was observed than with YbIII and EuIII. Lastly, we have observed unusual sensitised emission from the upper (4F5/2, 2H9/2) excited state of NdIII at approximately 800 nm, which we report here for the first time from a molecular species in solution.
2015
Moore, E.G., Benaglia, M., Bergamini, G., Ceroni, P. (2015). Synthesis, Stability and Sensitised Lanthanide Luminescence of Heterobimetallic d/f Terpyridine Complexes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 2015(3), 414-420 [10.1002/ejic.201403100].
Moore, Evan G.; Benaglia, Massimo; Bergamini, Giacomo; Ceroni, Paola
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/520691
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