Ligand-sensitized lanthanide(III) luminescence with octadentate bispidines

• Verfasst von: Braun, Felix [VerfasserIn]
• Verfasst von: Comba, Peter [VerfasserIn]
• Verfasst von: Herten, Dirk-Peter [VerfasserIn]
• Verfasst von: Pokrandt, Bianca [VerfasserIn]
• Verfasst von: Wadepohl, Hubert [VerfasserIn]
• Titel: Ligand-sensitized lanthanide(III) luminescence with octadentate bispidines
• Verf.angabe: Felix Braun, Peter Comba, Laura Grimm, Dirk-Peter Herten, Bianca Pokrandt, Hubert Wadepohl
• Jahr: 2019
• Umfang: 5 S.
• Fussnoten: Available online 29 September 2018 ; Gesehen am 01.08.2019
• Titel Quelle: Enthalten in: Inorganica chimica acta
• Ort Quelle: New York, NY [u.a.] : Elsevier, 1967
• Jahr Quelle: 2019
• Band/Heft Quelle: 484(2019), Seite 464-468
• ISSN Quelle: 0020-1693
• DOI: doi:10.1016/j.ica.2018.09.078
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Antenna effect
• Sach-SW: Bispidine
• Sach-SW: Lanthanide
• Sach-SW: Luminescence
• K10plus-PPN: 1670450848

Abstract

The octadentate bispidine ligand L (bispidine=3,7-diazabicyclo[3,3,1]nonane) with two pyridine groups at C2 and C4 and two picolinates at N3 and N7, providing two tertiary amines, four pyridines and two carboxylates to metal ions, has been coordinated to lanthanide(III) ions (SmIII, EuIII, TbIII, DyIII, HoIII). The single crystal X-ray structures of [TbIII(L)(NO3)] and [HoIII(L)(OH2)](TFA) (TFA=trifluoracetate) have been determined and define the complexes as 9-coordinate with a monodentate nitrate or a water molecule completing the coordination sphere. Spectroscopy indicates that in solution all complexes are 9-coordinate with an OH2 coordinated to the lanthanide(III) center. Absorption and emission spectra show that the ligands function as antennas with UV excitation (260nm) leading to relatively high intensity emission in the visible region (500-600nm) with millisecond lifetimes of the excited states.