Mn(III) complexes of the monoprotic tridentate ONN donor 2-[2-(1H-(benzo[d]imidazol-2-yl)ethylimino)methyl]phenol as a functional mimic of haloperoxidase

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• 作者：Mannar R. Maurya ; Priyanka Saini ; Chanchal Haldar ; Fern ; o Avecilla
• 关键词：Manganese(III) complexes ; Crystal structure ; Oxidative bromination of styrene ; Functional model of haloperoxidases
• 刊名：Polyhedron
• 出版年：2012
• 出版时间：9 October, 2012
• 年：2012
• 卷：46
• 期：1
• 页码：33-40
• 全文大小：715 K

文摘

The reaction of Mn^II(ClO₄)₂ with 2-[2-(1H-(benzo[d]imidazol-2-yl)ethylimino)methyl]phenol (Hsal-aebmz, I) under aerobic conditions results in the formation of [Mn^III(sal-aebmz)₂]¡¤ClO₄ (1). In the presence of triethylamine and using MnCl₂ under aerobic conditions, I forms [Mn^III(sal-aebmz-H)(sal-aebmz)] (2). These complexes are characterised on the basis of elemental and electrochemical analyses, spectroscopic (IR and UV-Vis) data and thermogravimetric studies. Single crystal X-ray analysis of 2 shows that it is stabilized in the solid state through intermolecular hydrogen bonding between the NH groups of the two benzimidazole moieties after losing one of the hydrogen atoms; the coordination sites of the ligand are the imine nitrogen of the benzimidazole ring, the azomethine nitrogen and the deprotonated phenolic oxygen. Complex 2 catalyses the oxidative bromination of styrene by H₂O₂, yielding 1,2-dibromo-1-phenylethane, 1-phenylethane-1,2-diol and 2-bromo-1-phenylethane-1-ol, acting as a functional mimic of haloperoxidases.