These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Benzothiazole- and benzoxazole-substituted pyridine-2-carboxylates as efficient sensitizers of europium luminescence.
    Author: Shavaleev NM, Scopelliti R, Gumy F, Bünzli JC.
    Journal: Inorg Chem; 2009 Jul 06; 48(13):6178-91. PubMed ID: 19441853.
    Abstract:
    A facile synthesis of benzothiazole- and benzoxazole-substituted pyridine-2-carboxylic acids has been developed. These ligands form mononuclear nine-coordinate complexes [Ln(kappa(3)-ligand)(2)(kappa(1)-ligand)(H(2)O)(2)] with light and heavy trivalent lanthanides, as established from the X-ray analysis of 11 complexes. A crystal structure of a minor product, the anhydrous nine-coordinate complex [Eu(kappa(3)-L)(3)], has also been determined. Photophysical studies of gadolinium chelates indicate that the triplet states of the new ligands are located at 20400-21400 cm(-1). The ligands are good sensitizers of the europium luminescence with ligand-to-metal energy transfer efficiency in the range 60-100%. The overall quantum yields of the europium emission are substantial, 12-14% in the solid state, and increase to 29-39% upon replacement of two metal-coordinated water molecules with dimethylsulfoxide in solution. The luminescence of near-infrared emitting lanthanides is also sensitized, but quantum yields are much smaller, reaching 0.17% for neodymium and 1.25% for ytterbium in DMSO, while energy transfer efficiencies for these two ions are below 50%.
    [Abstract] [Full Text] [Related] [New Search]