1,3-Bis(alkylimino)isoindolinates of rare earth metals: Synthesis, molecular structure and photoluminescence

The rare earth metal isoindolinates Ln(iPrL)3 (Ln = Sc (1), Y (2), Eu (3), Dy (4), Yb (5); iPrL = 1,3-bis(isopropylimino)isoindolinate anion) and [(MeL)Ce]2(μ-MeL)4 (6) (MeL = 1,3-bis(methylimino)isoindolinate anion) were synthesized by reactions of the amides Ln[N(SiMe3)2]3 with 1,3-bis(isopropylimino)isoindoline (iPrLH) or 1,3-bis(methylimino)isoindoline (MeLH), respectively. The X-ray diffraction study revealed that in monomeric molecules of the isopropyl-substituted compounds 2 and 4 the cations Ln3+ are η2-coordinated by three isoindolinate ligands. The methyl-substituted 6 exists in a crystal as a dimer containing two terminal η2-coordinated ligands and four bridging isoindolinate ligands two of which are bonded to Ce atoms in η3 fashion (η:η:η-N,N,N) but two others in η4 manner (η:η2:η-N,N,N). All the obtained complexes in solutions exhibited ligand-centered photoluminescence, the spectra of which consist of one broadened band with a maximum at 400–450 nm.

The rare earth metal isoindolinates Ln(iPrL)3 (Ln = Sc (1), Y (2), Eu (3), Dy (4), Yb (5); iPrL = 1,3-bis(isopropylimino)isoindolinate anion) and [(MeL)Ce]2(μ-MeL)4 (6) (MeL = 1,3-bis(methylimino)isoindolinate anion) were synthesized. The X-ray diffraction study revealed that in monomeric molecules 2, 4 the cations Ln3+ are η2-coordinated by three isoindolinate ligands and 6 exists in a crystal as a dimer containing two terminal η2-coordinated ligands and four bridging isoindolinate ligands two of which are bonded to Ce atoms in η3 fashion (η:η:η-N,N,N) but two others in η4 manner (η:η2:η-N,N,N).Figure optionsDownload as PowerPoint slide