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Issue 47, 2018
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Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes

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Abstract

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.

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

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Article information


Submitted
08 Oct 2018
Accepted
12 Nov 2018
First published
21 Nov 2018

Dalton Trans., 2018,47, 17055-17066
Article type
Paper

Slow magnetization dynamics in Co(II)/Co(III) triethanolamine/pivalate complexes

C. Sarto, M. Rouzières, J. Liu, H. Bamberger, J. van Slageren, R. Clérac and P. Alborés, Dalton Trans., 2018, 47, 17055
DOI: 10.1039/C8DT04041A

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