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Synthesis, Stability and Sensitised Lanthanide Luminescence of Heterobimetallic d/f Terpyridine Complexes
Author(s) -
Moore Evan G.,
Benaglia Massimo,
Bergamini Giacomo,
Ceroni Paola
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201403100
Subject(s) - chemistry , terpyridine , lanthanide , excited state , luminescence , ligand (biochemistry) , bimetallic strip , photochemistry , moiety , heteronuclear molecule , ruthenium , metal , crystallography , stereochemistry , ion , nuclear magnetic resonance spectroscopy , catalysis , nuclear physics , biochemistry , physics , receptor , optoelectronics , organic chemistry
The synthesis, solution behavior and photophysical properties of several heteronuclear bimetallic d/f complexes that utilise a Ru II bis‐terpyridine moiety as the sensitiser for Eu III , Nd III and Yb III luminescence are reported and compared to a Gd III analogue. The former compounds display sensitised emission in the visible and near‐infrared (NIR) regions depending on the choice of the Ln III cation. We illustrate that sensitised lanthanide emission can operate by two distinctly different pathways that involve either the triplet ligand‐centred ( 3 LC) excited state of the organic ligand or the triplet metal‐to‐ligand charge transfer ( 3 MLCT) excited state of the Ru II complex. Owing to the electronic structure of this antenna and the higher density of metal‐centred accepting states, a higher sensitization efficiency with Nd III was observed than with Yb III and Eu III . Lastly, we have observed unusual sensitised emission from the upper ( 4 F 5/2 , 2 H 9/2 ) excited state of Nd III at approximately 800 nm, which we report here for the first time from a molecular species in solution.