Abstract
We report on the synthesis, characterization, and photophysical investigation of a new nine-coordinate Eu3+ complex containing three tridentate ligands and exhibiting one of the highest emission quantum yields (Φ = 85 %) so far reported in solution. Ligand field theory (LFT) and semiempirical calculations were employed to predict the energies of the 7F stark levels of the ion with the aim to find the best geometry of the complex on the basis of matching experimental data. The results from the LFT analysis corroborated the existence of a nine-coordinate Eu3+ center and proved the transferability of the charge factors used in this theoretical model. Our findings contribute to the design and full characterization of highly luminescent Eu3+ complexes, and our approach could be extended to other trivalent lanthanide complexes.
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