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Synthesis and structures of dimeric iron(III)Oxo and -imido complexes containing intramolecular hydrogen bonds

机译:分子内氢键的二聚铁(III)Oxo和-亚氨基配合物的合成与结构

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Hydrogen bonding networks proximal to metal centers are emerging as a viable means for controlling secondary coordination spheres. This has led to the regulation of reactivity and isolation of complexes with new structural motifs. We have used the tridenate ligand bis[(N'-tert-butylureido)-N-ethyl]-N-methylaminato ([H(2)1](2-)) that contains two hydrogen bond donors to examine the oxidation of the Fell-acetate complex, [Fe(II)H(2)1(eta(2)-OAc)](-) with dioxygen, amine N-oxides, and xylyl azide. A complex with Fe-III-O-Fe-III. core results from the oxidation with dioxygen and amine N-oxides, in which the oxo ligand is involved in hydrogen bonding to the [H(2)1](2-) ligand. A distinctly different hydrogen bonding network was found in Fe-III dimer isolated from the reaction with the xylyl azide: a rare Fe-III-N(R)-Fe-III core was observed that does not have hydrogen bonds to the bridging nitrogen atom. The intramolecular H-bond networks within these dimers appear to adjust to the presence of the bridging species and rearrange to its size and electron density. (C) 2007 Elsevier B.V. All rights reserved.
机译:靠近金属中心的氢键网络正在成为控制次级配位球的可行手段。这导致了对反应性的调节和具有新的结构基序的复合物的分离。我们已经使用了包含两个氢键供体的三烯配体bis [((N'-叔丁基脲基)-N-乙基] -N-甲基氨基([H(2)1](2-))来检查掉落乙酸酯络合物[Fe(II)H(2)1(eta(2)-OAc)](-)与双氧,胺N-氧化物和二甲苯甲酰叠氮。与Fe-III-O-Fe-III的配合物。核心是由双氧和胺N-氧化物的氧化所致,其中氧代配体参与与[H(2)1](2-)配体的氢键结合。从与二甲苯叠氮化物的反应中分离出的Fe-III二聚体中发现了截然不同的氢键网络:观察到稀有的Fe-III-N(R)-Fe-III核与桥接的氮原子没有氢键。这些二聚体中的分子内氢键网络似乎可以调节桥接物种的存在,并重新排列其大小和电子密度。 (C)2007 Elsevier B.V.保留所有权利。

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