Energy-barrier enhancement by ligand substitution in tetrairon(III) single-molecule magnets

被引：118

作者：

Cornia, A

Fabretti, AC

Garrisi, P

Mortalò, C

Bonacchi, D

Gatteschi, D

Sessoli, R

Sorace, L

Wernsdorfer, W

Barra, AL

机构：

[1] Univ Modena, Ctr SCS, Dipartimento Chim, UdR INSTM, I-41100 Modena, Italy

[2] Univ Florence, Polo Sci Univ, UdR INSTM, Dipartimento Chim, I-50019 Sesto Fiorentino, Italy

[3] CNRS, Lab Louis Neel, F-38042 Grenoble, France

[4] CNRS, Lab Champs Magnet Intenses, F-38042 Grenoble 9, France

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2004年 / 43卷 / 09期

关键词：

cluster compounds; iron; magnetic properties; single-molecule magnets; tripodal ligands;

D O I：

10.1002/anie.200352989

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A relaxing time: A dramatic increase of the energy barrier (U eff) 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.

引用

页码：1136 / 1139

页数：4

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