Abstract
AbstractThe 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.
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