Magneto-structural correlation in lanthanide luminescent [2.2]Paracyclophane-based Single-Molecule Magnets - Archive ouverte HAL
Article Dans Une Revue Dalton Transactions Année : 2024

Magneto-structural correlation in lanthanide luminescent [2.2]Paracyclophane-based Single-Molecule Magnets

Annika Sickinger
Olivier Cador
Laurent Micouin
Olivier Maury

Résumé

The association of lanthanide ions and paracyclophane derivatives has been very scarcely reported in the literature. In this study, elaboration of five coordination lanthanide complexes involving the 1,4(1,4)-dibenzenacyclohexaphane-1,4-diylbis(diphenylphosphine oxide) ligand () was achieved with the determination of single-crystal X-ray diffraction structures of four mononuclear complexes of formula [Ln(hfac)()] (hfac- = 1,1,1,5,5,5-hexafluoroacetylacetonate) (Ln = Dy(III) (1-Dy) and Yb(III) (2-Yb)) and [Ln(tta)()] (tta = 2-tenoyl-trifluoroacetylacetonate) (Ln = Dy(III) (3-Dy) and Yb(III) (4-Yb)) and one dinuclear complex [Na(Dy(hfac)())](BArF) (BArF = tetrakis[3,5-bis(trifluoromethyl)phenyl]borate) (5-Dy). The compounds were characterized using elemental analysis, IR spectroscopy, DC and AC magnetic measurements and photophysical investigations. L is an efficient organic chromophore for the sensitization of both visible Dy(III) (1-Dy) and near-infrared Yb(III) (2-Yb and 4-Yb) luminescence. The combination of excitation and emission spectra allowed the determination of the crystal field spitting of both the F ground state and F excited state for 2-Yb and 4-Yb. Moreover, 3-Dy and the two Yb(III) derivatives displayed field-induced single-molecule magnet (SMM) behaviour with slow magnetic relaxation occurring through the Raman process only for 2-Yb and 4-Yb, whereas a combination of Orbach and Raman processes was identified for 3-Dy.

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Dates et versions

hal-04571100 , version 1 (07-05-2024)

Identifiants

Citer

Hadrien Flichot, Annika Sickinger, Jules Brom, Bertrand Lefeuvre, Vincent Dorcet, et al.. Magneto-structural correlation in lanthanide luminescent [2.2]Paracyclophane-based Single-Molecule Magnets. Dalton Transactions, 2024, 53 (19), pp.8191-8201. ⟨10.1039/d4dt00536h⟩. ⟨hal-04571100⟩
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