Single-molecule magnet behaviour in a tetranuclear Dy III complex formed from a novel tetrazine-centered hydrazone Schiff base ligand

Two analogous tetranuclear lanthanide complexes have been synthesized with the general formula [Ln (vht) (MeOH) ](NO ) ·aMeOH·bH O, where H vht = (3,6-bis(vanillidenehydrazinyl)-1,2,4,5-tetrazine) and Ln = Dy (1), Gd (2). These complexes are characterized by several techniques; including single-crys...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2017, Vol.46 (8), p.2471-2478
Main Authors: Lacelle, T, Brunet, G, Pialat, A, Holmberg, R J, Lan, Y, Gabidullin, B, Korobkov, I, Wernsdorfer, W, Murugesu, M
Format: Article
Language:English
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Chemical Sciences
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Summary:Two analogous tetranuclear lanthanide complexes have been synthesized with the general formula [Ln (vht) (MeOH) ](NO ) ·aMeOH·bH O, where H vht = (3,6-bis(vanillidenehydrazinyl)-1,2,4,5-tetrazine) and Ln = Dy (1), Gd (2). These complexes are characterized by several techniques; including single-crystal X-ray diffraction, SQUID magnetometry and single-crystal micro-SQUID hysteresis loop measurements. Elucidation of the crystal structure of the complexes shows that the lanthanide ions are bridged by a tetrazine ring, a rare bridging moiety for lanthanide ions. Magnetic studies reveal that both 1 and 2 exhibit weak ferromagnetic exchange interactions between Ln ions, and 1 displaying Single-Molecule Magnet (SMM) behaviour with a magnetisation reversal barrier of U = 158 K (τ = 1.06 × 10 s).
ISSN:1477-9226
1477-9234
DOI:10.1039/c6dt04413a