Many different applications of rare-earth-based compounds originate from their unique physical properties: strong spin-orbit coupling, large magnetization and chore 4f-orbitals. To enhance these properties for specific applications, the synthesis and characterization of new organometallic compounds of divalent and trivalent lanthanides is the key to obtain a larger scope of properties aside to the well-known cyclopentadienyl-based ligands. In the case of f-element based Single Molecule Magnet, Rinehart and Long rationalized the influence of the ligand field tuning on the magnetic anisotropy of such compounds. Following their concept, the record blocking temperature of 80 K was achieved with a close to linear sandwich complexes of Dysprosium. Considering that large aromatic rings, such as cyclooctatetraenyl (cot) and cyclononatetraenyl (cnt) ligands were recently presented as interesting tools to prepare linear complexes of lanthanides, the presentation will focus on the synthesis and magnetic characterization of new divalent (cot)<sub>2</sub>Tm<sup>2-</sup> complexes, as well as the (cot)Ln(cnt) series (Ln = Tb, Dy, Ho, Er, Tm, Lu), which present an interesting distortion of the Cnt ligand along with the size of the lanthanide ion.

New linear sandwich complexes of divalent and trivalent lanthanides

ACS Spring Meeting 2021

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