Carbazole-Functionalized Dipicolinato Ln^III Complexes Show Two-Photon Excitation and Viscosity-Sensitive Metal-Centered Emission.

ABSTRACT: Eu^III and Yb^III complexes with the carbazole-dipicolinato ligand dpaCbz^2-, namely K₃[Eu(dpaCbz)₃] and K₃[Yb(dpaCbz)₃], were isolated. The Eu^III complex displayed metal-centred emission upon one-photon excitation with a sensitized emission efficiency ΦLLn of 1.8±0.3 %, corresponding to an intrinsic emission efficiency ΦLnLn of 46% and a sensitization efficiency of η_sens 3.9%, with an emission lifetime of the emissive state τ of 1.087±0.005 ms. The Yb^III complex displayed ΦLLn of 0.010±0.001 %, and a τ of 2.32±0.06 μs. The Eu^III-centred emission was sensitized as well upon two-photon excitation and a two-photon absorption cross-section σ_2PA of 63 GM at 75

SUBMITTER: Monteiro JHSK 

PROVIDER: S-EPMC9004684 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature