Inorganic Chemistry

Distributive Nd-to-Yb Energy Transfer within Pure [YbNdYb] Heterometallic Molecules

Authors

  • Olivier Roubeau Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza ,
  • Nicholas S. Settineri Advanced Light Source, Berkeley Laboratory & Department of Chemistry, University of California, Berkeleyource, Berkeley Laboratory ,
  • Yannick Guyot Univ. Lyon, Institut Lumière Matière, UMR 5306 CNRS–Université Claude Bernard ,
  • François Riobé Univ Lyon, ENS Lyon, CNRS ,
  • Olivier Maury Univ Lyon, ENS Lyon, CNRS ,
  • Laura Abad Galán Departamento de Química Inorgánica, Universidad Complutense de Madrid ,
  • Guillem Aromi Departament de Química Inorgànica i Orgànica, Universitat de Barcelona & Institute of Nanoscience and Nanotechnology of the Univesity of Barcelona ,
  • David Aguilà Departament de Química Inorgànica i Orgànica, Universitat de Barcelona & Institute of Nanoscience and Nanotechnology of the Univesity of Barcelona ,
  • Leoní A. Barrios Departament de Química Inorgànica i Orgànica, Universitat de Barcelona & Institute of Nanoscience and Nanotechnology of the Univesity of Barcelona ,
  • Annika Sickinger Univ Lyon, ENS Lyon, CNRS ,
  • Diamantoula Maniaki Departament de Química Inorgànica i Orgànica, Universitat de Barcelona & Institute of Nanoscience and Nanotechnology of the Univesity of Barcelona

Abstract

Facile access to pure heterolanthanide molecules will open new avenues in the search of novel photophysical phenomena based on Ln-to-Ln’ energy transfer (ET). This challenge demands strategies to segregate efficiently different Ln metal ions among different positions in a molecule. We report here the one-step synthesis and structure of a pure [YbNdYb] (1) coordination complex featuring short Yb···Nd distances, ideal to investigate a potential distributive intramolecular ET from one Nd3+ ion to two Yb3+ centers within a well characterized molecule. The difference in ionic radius is the mechanism allowing to allocate selectively both types of metal ion within the molecular structure, exploited with the simultaneous use of two β-diketone type ligands. To assist the photophysical investigation of this heterometallic species, the analogues [YbLaYb] (2) and [LuNdLu] (3) have also been prepared. Sensitization of Yb3+ and Nd3+ in the last two complexes, respectively, was observed, with remarkably long decay times, facilitating the determination of the Nd-to-Yb ET within the [YbNdYb] composite. This ET was demonstrated by comparing the emission of iso-absorbant solutions of 1, 2 and 3 and through lifetime determinations in solution and solid state. The comparatively high efficiency of this process corroborates the facilitating effect of the double channel for the non-radiative decay of Nd3+ created within the [YbNdYb] molecule.

Content

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Supplementary material

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Suplementary Information
Additional information about the experimental procedure, X-ray diffraction study and photophysical properties.