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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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Published in: | Angewandte Chemie International Edition 2004-02, Vol.43 (9), p.1136-1139 |
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creator | Cornia, Andrea Fabretti, Antonio C. Garrisi, Pierfrancesco Mortalò, Cecilia Bonacchi, Daniele Gatteschi, Dante Sessoli, Roberta Sorace, Lorenzo Wernsdorfer, Wolfgang Barra, Anne-Laure |
description | 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. |
doi_str_mv | 10.1002/anie.200352989 |
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subjects | cluster compounds iron magnetic properties single-molecule magnets tripodal ligands |
title | Energy-Barrier Enhancement by Ligand Substitution in Tetrairon(III) Single-Molecule Magnets |
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