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Issue 14, 2019
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Slow magnetization dynamics in a six-coordinate Fe(ii)–radical complex

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A new paramagnetic ligand, betaDTDA, and its coordination complex with Fe(hfac)2 are reported (betaDTDA = 4-(benzothiazol-2′-yl)-1,2,3,5-dithiadiazolyl; hfac = 1,1,1,5,5,5-hexafluoroacetylacetonato-). The neutral radical betaDTDA is the first dithiadiazolyl ligand designed to include an electropositive sulphur moiety outside the thiazyl heterocycle, increasing the capacity for supramolecular, structure-directing electrostatic contacts and enabling new pathways for magnetic exchange. The Fe(hfac)2(betaDTDA) complex is composed of a hs-Fe(II) center with the three bidentate ligands arranged about the ion in a distorted octahedral 6-coordinate environment. The magnetic properties of crystalline Fe(hfac)2(betaDTDA) are consistent with strong antiferromagnetic (AF) coupling between the metal and ligand moments, giving rise to a well-defined Stotal = 3/2 ground state that is the only thermally populated state below 40 K. Below 4 K, this complex exhibits slow relaxation of the magnetization detected by ac susceptibility measurements consistent with a single-molecule magnet (SMM) behaviour.

Graphical abstract: Slow magnetization dynamics in a six-coordinate Fe(ii)–radical complex

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Article information

05 Feb 2019
06 Mar 2019
First published
06 Mar 2019

Dalton Trans., 2019,48, 4514-4519
Article type

Slow magnetization dynamics in a six-coordinate Fe(II)–radical complex

C. A. Michalowicz, M. B. Mills, E. Song, D. V. Soldatov, P. D. Boyle, M. Rouzières, R. Clérac and K. E. Preuss, Dalton Trans., 2019, 48, 4514
DOI: 10.1039/C9DT00558G

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