A dramatic increase of the energy barrier (Ueff) in tetrairon(III) single-mol. magnets can be achieved by simple chem. 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 [Fe4(thme)2(dpm)6] with Ueff/kB = 15.6(2) K and a magnetic relaxation time exceeding 1000 s at T <0.2 K. The prepd. complex is trigonal, space group R-3c, Z = 6, R1 = 0.0370, R2 = 0.1089.
Energy Barrier Enhancement by Ligand Substitution in Tetrairon(III) Single Molecule Magnets / Cornia, Andrea; FABRETTI COSTANTINO, Antonio; P., Garrisi; Mortalo', Cecilia; D., Bonacchi; D., Gatteschi; R., Sessoli; L., Sorace; W., Wernsdorfer; Barra, A. –. L.. - 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
CORNIA, Andrea;FABRETTI COSTANTINO, Antonio;MORTALO', Cecilia;
2004
Abstract
A dramatic increase of the energy barrier (Ueff) in tetrairon(III) single-mol. magnets can be achieved by simple chem. 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 [Fe4(thme)2(dpm)6] with Ueff/kB = 15.6(2) K and a magnetic relaxation time exceeding 1000 s at T <0.2 K. The prepd. complex is trigonal, space group R-3c, Z = 6, R1 = 0.0370, R2 = 0.1089.
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