Quantification of C−H Quenching in Near-IR Luminescent Ytterbium and Neodymium Cryptates

Two series of selectively deuterated cryptates with the lanthanoids Yb and Nd have been synthesized, and the luminescence lifetimes for the corresponding near-IR emission bands have been measured. Global fitting of these lifetime data combined with structural analysis allows for the accurate quantification of the contributions of individual C−H oscillators groups in the ligand to the nonradiative deactivation rates of the emissive lanthanoid states.