Structural and magnetic investigations of a binuclear coordination compound of dysprosium(iii) dinitrobenzoate

Abstract : A centro-symmetric binuclear compound of formula [Dy(L)·(CH3COO)2·(H2O)2]2 (1) was isolated from the reaction between the 2,4-dinitrobenzoate anion (L) and the tris(acetate) of Dy(iii). Single crystal diffraction studies reveal a μ1-κ2,η1:η1 chelating binding mode of L while the binuclear compound is formed by the two bridging (μ2-κ3,η1:η2) acetate anions. The nona-coordinated sphere of each Dy(iii) ion is filled with a chelating (κ2,η1:η1) acetate anion and two terminal water molecules. Static magnetic measurements combined with ab initio SA-CASSCF/RASSI-SO calculations lead to two intramolecular competitive interactions i.e. ferromagnetic exchange interactions (0.04 cm-1) and antiferromagnetic dipolar interactions (-0.5 cm-1). Finally, dynamic magnetic measurements revealed a Single-Molecule Magnet behaviour in a zero-applied magnetic field with an effective energy barrier Δ = 21.5(2) cm-1 and τ0 = 7(3) × 10-6 s through Orbach and Quantum Tunnelling of the Magnetization relaxation mechanisms.
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Submitted on : Thursday, April 4, 2019 - 1:14:12 PM
Last modification on : Friday, June 14, 2019 - 1:04:36 PM

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B.S. Sran, J.F. Gonzalez, V. Montigaud, B. Le Guennic, F. Pointillart, et al.. Structural and magnetic investigations of a binuclear coordination compound of dysprosium(iii) dinitrobenzoate. Dalton Transactions, Royal Society of Chemistry, 2019, 48 (12), pp.3922-3929. ⟨10.1039/C8DT04253E⟩. ⟨hal-02090011⟩

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