Solid and solution state structures of mono- and di-nuclear iron(III) complexes of related hexadentate and pentadentate aminopyridyl ligands

被引:70
作者
Duelund, L [1 ]
Hazell, R
McKenzie, CJ
Nielsen, LP
Toftlund, H
机构
[1] Med Univ Lubeck, Inst Phys, D-23538 Lubeck, Germany
[2] Aarhus Univ, Dept Chem, DK-8000 Aarhus, Denmark
[3] Odense Univ, Univ So Denmark, Dept Chem, DK-5230 Odense, Denmark
来源
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 2001年 / 02期
关键词
D O I
10.1039/b007799m
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Two mononuclear iron(III) complexes formed with the related ligands N,N,N',N'-tetrakis(2-pyridylmethyl)ethylenediamine (tpen) and N-benzyl-N,N',N'-tris(2-pyridylmethyl)ethylenediamine (bztpen) have been studied. X-Ray crystallography reveals for the complex [Fe(tpen)][ClO4](3) that tpen acts as a hexadentate ligand in the solid state. In methanol or water containing solutions it was shown by EPR and UV-Vis spectroscopy that one pyridyl arm is exchanged by a solvent molecule. In dmf solution only partial exchange of a pyridyl arm was observed. The complex with the related pentadentate ligand bztpen [Fe(bztpen)Cl][ClO4](2) showed exchange of the coordinated chloride with methanol and water, but not with dmf. In water containing solutions both complexes are slowly converted into the dimeric mu -oxo complexes [(tpen)Fe-III(Cl)OFeIII(Cl)(tpen)](2+) or [(bztpen)Fe-III(Cl)OFeIII(Cl)(bztpen)](2+). This reaction is accelerated by addition of an excess of chloride.
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收藏
页码:152 / 156
页数:5
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