Novel preorganized hemispherands to encapsulate rare earth ions: Shielding and ligand deuteration for prolonged lifetimes of excited Eu~3+ ions

摘要

Quenching of the luminescent excited state of Eu~3+ ions by C-H high-vibrational modes was studied by deuteration of the encapsulating ligand and the solvent. Novel polydentate hemispherands providing nine donor atoms, which from overall neutral complexes with rare earth ions, were synthesized in nine steps, allowing the easy incorporation of deuterium atoms (11a-d. Eu~3+).