Syntheses, structures and properties of a series of non-heme alkoxide-Fe(III) complexes of a benzimidazolyl-rich ligand as models for lipoxygenase
作者:Guiling Wu、Fusheng Mei、Qian Gao、Fang Han、Shemin Lan、Jianming Zhang、Dongfeng Li
DOI:10.1039/c0dt01760d
日期:——
The treatment of Fe(ClO4)2·6H2O or Fe(ClO4)3·9H2O with a benzimidazolyl-rich ligand, N,N,N′,N′-tetrakis[(1-methyl-2-benzimidazolyl)methyl]-1,2-ethanediamine (medtb) in alcohol/MeCN gives a mononuclear ferrous complex, [FeII(medtb)](ClO4)2·½CH3CN·½CH3OH (1), and four non-heme alkoxide–iron(III) complexes, [FeIII(OMe)(medtb)](ClO4)2·H2O (2, alcohol = MeOH), [FeIII(OEt)(Hmedtb)](ClO4)3·CH3CN (3, alcohol = EtOH), [FeIII(OnPr)(Hmedtb)](ClO4)3·nPrOH·2CH3CN (4, alcohol = n-PrOH), and [FeIII(OnBu)(Hmedtb)](ClO4)3·3CH3CN·H2O (5, alcohol = n-BuOH), respectively. The alkoxide–iron(III) complexes all show 1) a Fe(III)–OR center (R = Me, 2; Et, 3; nPr, 4; nBu, 5) with the Fe–O bond distances in the range of 1.781–1.816 Å, and 2) a yellow color and an intense electronic transition around 370 nm. The alkoxide–iron(III) complexes can be reduced by organic compounds with a cis,cis-1,4-diene moiety via the hydrogen atom abstraction reaction.
将 Fe(ClO4)2-6H2O 或 Fe(ClO4)3-9H2O 与富含苯并咪唑的配体 N,N,N′,N′-四[(1-甲基-2-苯并咪唑基)甲基]-1、2-乙二胺(medtb)在醇/MeCN 中的反应生成单核亚铁络合物 [FeII(medtb)](ClO4)2-½CH3CN-½CH3OH (1)、以及四种非血红素氧化烷基铁(III)配合物:[FeIII(OMe)(medtb)](ClO4)2-H2O(2,醇 = MeOH)、[FeIII(OEt)(Hmedtb)](ClO4)3-CH3CN(3,醇 = EtOH)、分别是[FeIII(OnPr)(Hmedtb)](ClO4)3-nPrOH-2CH3CN(4,醇 = n-PrOH)和[FeIII(OnBu)(Hmedtb)](ClO4)3-3CH3CN-H2O(5,醇 = n-BuOH)。烷氧化物-铁(III)配合物均显示出:1)Fe(III)-OR 中心(R = Me,2;Et,3;nPr,4;nBu,5),Fe-O 键距离在 1.781-1.816 Å 范围内;2)黄色和 370 nm 附近的强烈电子转变。烷氧化铁(III)配合物可以通过氢原子抽取反应被具有顺式、顺式-1,4-二烯分子的有机化合物还原。