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.
Energy-barrier enhancement by ligand substitution in tetrairon(III)single-molecule magnets / A. CORNIA; A. C. FABRETTI; P. GARRISI; C. MORTAL; D. BONACCHI; D. GATTESCHI; R. SESSOLI; L. SORACE; W. WERNSDORFER; A. L BARRA. - In: ANGEWANDTE CHEMIE. INTERNATIONAL EDITION. - ISSN 1433-7851. - STAMPA. - 43:(2004), pp. 1136-1139. [10.1002/anie.200352989]
Energy-barrier enhancement by ligand substitution in tetrairon(III)single-molecule magnets
GATTESCHI, DANTE;SESSOLI, ROBERTA;SORACE, LORENZO;
2004
Abstract
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.
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