Antiferromagnetic exchange in meta-phenylene bridged bis(tris-o-iminosemiquinonato)metal complexes
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- 作者：Dei ; A. ; Gatteschi ; D. ; Sangregorio ; C. ; Sorace ; L. ; Vaz ; M.G.F.
- 关键词：72.80.Ga ; 75.30.Cr ; 76.30.&minus ; v ; Semiquinones ; Polyradicals ; Antiferromagnetic coupling ; Singlet-triplet transition
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2004
- 出版时间：May, 2004
- 年：2004
- 卷：272-276
- 期：Part 2
- 页码：1083-1084
- 全文大小：203 K
文摘
By reaction of the ligand N,N′ bis(3,5-di-tert-butyl-2-hydroxyphenyl)-1,3-phenylenediamine (1), with Fe, Co or Mn salts, three complexes were synthesized where the bis-bidentate ligand is in the bis-semiquinonato oxidation state. Although the m-phenylene linker is known to afford ferromagnetic coupling in diradicals, the antiferromagnetic interaction of intramolecular origin we observed is not unexpected, given the large torsion angles between the semiquinonato and the m-phenylene planes.