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SMM Behavior Tuned by an Exchange Coupling LEGO Approach for Chimeric Compounds: First 2p-3d-4f Heterotrispin Complexes with Different Metal Ions Bridged by One Aminoxyl Group.

08:00 EDT 19th September 2019 | BioPortfolio

Summary of "SMM Behavior Tuned by an Exchange Coupling LEGO Approach for Chimeric Compounds: First 2p-3d-4f Heterotrispin Complexes with Different Metal Ions Bridged by One Aminoxyl Group."

Coordination compounds containing three different spin carriers (2p, 3d, and 4f), with the general formula [MDy(LH)(hfac)] (M = Co, Ni, Mn, Zn), have been obtained using Mannich ligands decorated with a nitronyl-nitroxide fragment. The synthetic approach is general and leads to binuclear 3d-4f complexes, the two metal ions being bridged by one aminoxyl group and by one oxygen atom arising from a hfac ligand. Triangular spin topology affords significant 2p-3d, 3d-4f, and 2p-4f exchange interactions. For the [CoDyRad] derivative obtained using a nitronyl-nitroxide chiral ligand, a high energy barrier (∼200 cm) and a slow relaxation behavior below 30 K were found and rationalized by calculations. The improvement of magnetic properties comes from the synergy of optimal single ions properties and exchange couplings contributions where the Co-Rad interaction becomes the leading one. The role played by this interaction is clearly proved by the investigation of the magnetic properties of the [ZnDyRad] derivative, with a much lower energy barrier (12.7 cm) and by the lack of SMM behavior of the previously reported [CoDyRad] compound ( . 2017 , 53 , 6504 ), with a linear topology of spin carriers and a negligible Co-Rad interaction.

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Name: Inorganic chemistry
ISSN: 1520-510X
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