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首页> 外文期刊>New Journal of Chemistry >First structurally characterized optically active mononuclear Mn(IV) complex:synthesis,crystal structure and properties of [Mn~(IV)L_2] {H_2L=S-(-)-2-[(2-hydroxy-l-phenylethylimino)methyl]phenol}
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First structurally characterized optically active mononuclear Mn(IV) complex:synthesis,crystal structure and properties of [Mn~(IV)L_2] {H_2L=S-(-)-2-[(2-hydroxy-l-phenylethylimino)methyl]phenol}

机译:首次结构表征的旋光性单核锰(IV)配合物:[Mn〜(IV)L_2] {H_2L = S-(-)-2-[(2-羟基-1-苯基乙基亚氨基)甲基]的合成,晶体结构和性质苯酚}

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摘要

The reaction of Mn(CH_3COO)_2·4H_2O with H_2L {H_2L=S-(-)-2-[(2-hydroxy-l-phenylethylimino)methyl]phenol} in the presence of air afforded dark brown crystals of [Mn~(IV)L_2],1.Compound 1 crystallizes in the monoclinic chiral C2 space group.Crystals of 1 were further characterized by elemental analysis,room temperature magnetic moment determination,IR,UV-visible and EPR spectroscopy,cyclic voltammetry and circular dichroism (CD) studies.Cyclic voltammetry reveals a quasi-reversible redox wave corresponding to the Mn(IV)/Mn(III) couple.The EPR spectrum at liquid nitrogen temperature consists of a strong signal at g approx4 and a weak but resolved response at g approx2.The CD spectrum of 1 exhibits a negative band,such as shown by the enantiopure ligand H_2L.Complex 1 was found to catalyze the oxidation of olefins using iodosobenzene as the oxidant in acetonitrile solutions.
机译:Mn(CH_3COO)_2·4H_2O与H_2L {H_2L = S-(-)-2-[(2-羟基-1-苯基乙基亚氨基)甲基]苯酚}在空气中的反应得到深褐色晶体[Mn〜 (IV)L_2],1。化合物1在单斜手性C2空间群中结晶。通过元素分析,室温磁矩测定,IR,紫外-可见和EPR光谱,循环伏安法和圆二色性,进一步表征1的晶体( CD)研究。循环伏安法揭示了与Mn(IV)/ Mn(III)对相对应的准可逆氧化还原波。液氮温度下的EPR谱由在g约4处的强信号和在g处的弱但分辨的响应组成1的CD光谱显示出负谱带,如对映体纯配体H_2L所示。发现复合物1在乙腈溶液中用碘代苯作为氧化剂催化烯烃的氧化。

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