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Article Dans Une Revue Dalton Transactions Année : 2018

Slow magnetization dynamics in Co( ii )/Co( iii ) triethanolamine/pivalate complexes

Résumé

We report the synthesis, structural characterization and a combined computational and experimental study of the magnetic properties of two pivalate cobalt complexes, a mononuclear Co(II) one and a tetranuclear Co(II)3Co(III) mixed valence polynuclear one. The latter shows SMM behaviour revealed under an applied DC field with a thermal barrier of ca. 30 cm−1 competing with direct and Raman relaxation processes. The Orbach thermal barrier can be understood from the doublets energy ladder arising from the anisotropic exchange interaction among ground Seff = 1/2 of each Co(II) sites. The strong local zero-field splitting of the S = 3/2 Co(II) states affords these well isolated ground Kramers doublets. DC and AC magnetic susceptibility measurements as well as HF-EPR spectra support this interpretation. CASSCF quantum chemical computations have been also performed in order to aid the overall comprehension of the magnetic behaviour in the reported complexes.

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Matériaux
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Dates et versions

hal-02276664 , version 1 (03-09-2019)

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Carolina Sarto, Mathieu Rouzières, Jun-Liang Liu, Heiko Bamberger, Joris van Slageren, et al.. Slow magnetization dynamics in Co( ii )/Co( iii ) triethanolamine/pivalate complexes. Dalton Transactions, 2018, 47 (47), pp.17055-17066. ⟨10.1039/c8dt04041a⟩. ⟨hal-02276664⟩

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