Synthesis and characterization of iron(II) and iron(III) complexes with a tridentate O,N,O′-ligand

被引:3
作者
Enthaler, Stephan [1 ]
Someya, Chika I. [1 ]
Irran, Elisabeth [2 ]
机构
[1] Tech Univ Berlin, Dept Chem, D-10623 Berlin, Germany
[2] Tech Univ Berlin, Inst Chem Metalorgan & Inorgan Mat, D-10623 Berlin, Germany
关键词
Iron; Tridentate ligand; Octahedral geometry; Oxidation states; COORDINATION CHEMISTRY; NICKEL-COMPLEXES; LIGAND DESIGN; MAGNETIC-PROPERTIES; NI(II) COMPLEXES; ACTIVATION; PRECATALYSTS;
D O I
10.1016/j.inoche.2014.12.017
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The coordination chemistry of the ligand precursor 1-benzoyl-4,5-dihydro-3,5-bis(trifluoromethyl)-1H-pyrazol-5-ol (1a) to iron(II) acetate was studied. In dependence of the added co-ligand different complex geometries were observed. In case of 4-dimethylaminopyridine (DMAP) as co-ligand an octahedral iron(II) complex was found with an O,N,O'-coordination of the tridentate ligand (1a-2H), in which the ligand is planar, the oxygen donors are trans to each other, and the nitrogen donor is in a cis position. The other coordination sites on the iron center are occupied by DMAP ligands. In contrast to that, with triphenylphosphane as the co-ligand an oxidation process took place, which revealed an octahedral iron(III) complex with a comparable geometry for the tridentate ligand-(O,N,O'-coordination, 1a-2H) demonstrating the usefulness of 1a-2H to stabilize different oxidation states. The additional coordination sites are occupied by one triphenylphosphane oxide and ethoxide ligands. Interestingly, the ethoxide ligands act as bridging ligands to form a bimetallic complex. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:56 / 59
页数:4
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