Molecular Lanthanide Switches for Magnetism and Photoluminescence
Résumé
Solvation of [(η9-CNT)Ln(η8-COT)] (Ln = La, Ce, Nd, Tb, Er; CNT = cyclononatetraenyl, i.e., C9H9-; COT = cyclooctatetraendiid, i.e., C8H82-) complexes with tetrahydrofuran (THF) gives rise to neutral [(η4-CNT)Ln(thf)2(η8-COT)] (Ln = La, Ce) and ionic [Ln(thf)x(η8-COT)][CNT] (x = 4 (Ce, Nd, Tb), 3 (Er)) species in a solid-to-solid transformation. Due to the severe distortion of the ligand sphere upon solvation, these species act as switchable luminophores and single-molecule magnets. The desolvation of the coordinated solvents can be triggered by applying a dynamic vacuum, as well as a temperature gradient stimulus. Raman spectroscopic investigations revealed fast and fully reversible solvation and desolvation processes. Moreover, we also show that a Nd:YAG laser can induce the necessary temperature gradient for a self-sufficient switching process of the Ce analogue in a spatially resolved manner.
Domaines
Chimie
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Munzfeld - Molecular Lanthanide Switches for Magnetism and Photoluminescence.pdf (9.55 Mo)
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