Energy-Barrier Enhancement by Ligand Substitution in Tetrairon(III) Single-Molecule Magnets

A relaxing time: A dramatic increase of the energy barrier (Ueff) in tetrairon(III) single‐molecule magnets can be achieved by simple chemical modification. Site‐specific replacement of the six methoxide bridges in [Fe4(OMe)6(dpm)6] (Hdpm=dipivaloylmethane; Ueff/kB=3.5 K) with two tripodal 1,1,1‐tri...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2004-02, Vol.43 (9), p.1136-1139
Main Authors: Cornia, Andrea, Fabretti, Antonio C., Garrisi, Pierfrancesco, Mortalò, Cecilia, Bonacchi, Daniele, Gatteschi, Dante, Sessoli, Roberta, Sorace, Lorenzo, Wernsdorfer, Wolfgang, Barra, Anne-Laure
Format: Article
Language:English
Subjects:
cluster compounds
iron
magnetic properties
single-molecule magnets
tripodal ligands
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Summary:A relaxing time: A dramatic increase of the energy barrier (Ueff) in tetrairon(III) single‐molecule magnets can be achieved by simple chemical modification. Site‐specific replacement of the six methoxide bridges in [Fe4(OMe)6(dpm)6] (Hdpm=dipivaloylmethane; Ueff/kB=3.5 K) with two tripodal 1,1,1‐tris(hydroxymethyl)ethane (H3thme) ligands affords the compound [Fe4(thme)2(dpm)6] (see figure) with Ueff/kB=15.6(2) K and a magnetic relaxation time exceeding 1000 s below 0.2 K.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.200352989