Published 21/09/2016
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Highly axial magnetic anisotropy in a n3o5 dysprosium(iii) coordination environment generated by a merocyanine ligand

K.Bernot , B.Le , T.Guizouarn , T.Roisnel , P.Selvanathan , G.Huang , G.Fernandez-Garcia , F.Totti , G.Calvez , L.Norel , S.Rigaut

Keywords
Introduction
Kaizu, Inorg. L. Frank, Chem. Y. Louie, Chem. Chem. , Int. Ed. Chem. , Int. Ed. Org. Chem. Org. Chem. Alvarez, Chem. Giordani, Chem. Soc. Rev. Am. Chem. Am. Chem. Am. Chem. Am. Chem. Am. Chem. Am. Chem. Am. Chem. Am. Chem. Am. Chem. Soc. 1998, 120, 3237-324Soc. 1998, 120, 3237-324Soc. 1998, 120, 3237-324Soc. 1998, 120, 3237-324Soc. 1998, 120, 3237-324Soc. 1998, 120, 3237-324Soc.
Resume
A spiropyran-based switchable ligand isomerizes upon reaction with lanthanide precursors to generate complexes with an unusual N3O5 coordination sphere. The air-stable dysprosium complex shows a hysteresis loop at 2 K and a very strong axial magnetic anisotropy generated by the merocyanine phenolate donor.
Method
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Results
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Conclusion
E analysis. YbIII and YIII derivatives are found isostructural with the DyIII one, even if full crystal structure solving has not been possible on the latter. It is worth to note that the standard thermal equilibrium between MC and SP isomers is totally shifted toward the MC form by the formation of the phenolate-lanthanide bond. This phenomenon has been described in solution for a variety of spiropyran derivatives with various 3d or 4f metal ions. However, this is the first time that a MC-lanthanide complex is structurally characterized.
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