Voltar
Artigo Revisado por pares
BIBTEX RIS

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

2004; Wiley; Volume: 43; Issue: 9 Linguagem: Inglês

10.1002/anie.200352989

ISSN

1521-3773

Autores

Andrea Cornia, Antonio C. Fabretti, Pierfrancesco Garrisi, Cecilia Mortalò, Daniele Bonacchi, Dante Gatteschi, Roberta Sessoli, Lorenzo Sorace, Wolfgang Wernsdorfer, Anne‐Laure Barra,

Tópico(s)

Porphyrin and Phthalocyanine Chemistry

Resumo

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.

Referência(s)