1. Synthesis and Structures of Tris(cyclononatetraenyl) Rare-Earth Complexes [Ln(C9H9)3] (Ln = Y, Gd, Tb, Dy, Ho, Er, Tm)
- Author
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Oleh Stetsiuk, Léo La Droitte, Violaine Goudy, Boris Le Guennic, Olivier Cador, Grégory Nocton, Laboratoire de Cristallographie Macromoléculaire (LCM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), ANR (French National Research Agency) French National Research Agency (ANR) [ANR-19-CE07-0019-1], CNRS Centre National de la Recherche Scientifique (CNRS) European Commission, Ecole polytechnique, and ANR-19-CE07-0019,RelaxMax,Complexes organométalliques de lanthanides à relaxation magnétique lente(2019)
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Inorganic Chemistry ,Organic Chemistry ,[CHIM]Chemical Sciences ,Physical and Theoretical Chemistry - Abstract
International audience; The article reports the synthesis and structural characterization of a series of Ln(C9H9)(3) complexes with the cyclononatetraenyl (Cnt, C9H9) ligand (Ln = Y, Gd, Tb, Dy, Ho, Er, Tm). The Yb and Sm complexes were not obtained, and the reaction of the potassium salt of the Cnt ligand with trivalent halide salts of the corresponding metals led to the known bis-Cnt sandwich compounds Ln(C9H9)(2). The X-ray diffraction studies on the trivalent complexes show that the Cnt ligand is significantly bent in order to accommodate the large size of the ligand while it maintains its aromaticity. When the size of the lanthanide ion decreases, the ligand does not switch away but swings over the metal ion in order to maximize the electrostatic interactions. H-1 NMR and UV-visible spectra, as well as the solid-state magnetism, were recorded. UV-visible spectroscopy highlights a remarkable charge-transfer band in the Tm complex, while ligand-based transitions are principally observed with all other metal ions. The magnetic behavior of the series agrees with trivalent lanthanide ions, and the computations at the CASSCF level confirm the trivalent electronic structure.
- Published
- 2022
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