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131.
Sénéchal-David K Pope SJ Quinn S Faulkner S Gunnlaugsson T 《Inorganic chemistry》2006,45(25):10040-10042
The development of novel mixed lanthanide-transition-metal (f-d) based supramolecular self-assemblies made from neodymium- and ytterbium-based tetraamide-functionalized cyclen complexes bearing a single 1,10-phenanthroline moiety coordinating to a RuII(bipy)2 (bipy = bipyridine) unit is described. Excitation of the Ru(II) metal-to-ligand charge-transfer band in water gave rise to long-wavelength sensitized emission from the Yb(III) or Nd(III) centers, observed in the near-infrared. 相似文献
132.
The synthesis and photophysical properties of a coordinatively unsaturated cationic dinuclear terbium complex, 2.Tb(2), that can detect the presence of mono- or bis(carboxylates) in buffered aqueous solution at physiological pH is described. Full ligand synthesis and structural characterization of 2.Na(2) are also described. Spectroscopic measurements determined that each Tb(III) metal center has two metal-bound water molecules (q = 2). The recognition or sensing of N,N-dimethylaminocarboxylic acid, 4, and the bis(carboxylate) terephthalic acid, 5, which can also function as sensitizing antennae, was found to occur through the binding of these carboxylates to the metal center via the displacement of the metal bound water molecules. This gave rise to the formation of luminescent ternary complexes in solution in 2:1 or 1:1 (ion:2.Tb(2)) stoichiometry, respectively. Aliphatic bis(carboxylates) also bind to 2.Tb(2) where the selectivity for the ion recognition and stoichiometry was dictated by the structure of the anion, being most selective for pimelic acid, 6. Binding of either l- or d-tartaric acid gave rise to the formation ternary complex formation, with 2:1 stoichiometry, where the ion recognition resulted in quenching of the lanthanide emission. 相似文献
133.
K. Bharuth-Ram H.P. Gunnlaugsson H. Masenda R. Sielemann G. Weyer U. Köster 《Physica B: Condensed Matter》2012,407(15):2923-2925
The annealing of defects in Sb/Sn implanted diamond has been studied in 119Sn Mössbauer spectroscopy following the implantation of radioactive parent isotopes 119Xe and 119mSn. Our results show that after annealing above 1300 K, 40% of the implanted ions are located at or near regular sites in the lattice. Significant implantation induced defects however remain. 相似文献