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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >The catalytic activities and magnetic behaviours of rare mu(3)-chlorido and mu(1,1,1)-azido bridged defective dicubane tetranuclear Mn(ii) complexes
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The catalytic activities and magnetic behaviours of rare mu(3)-chlorido and mu(1,1,1)-azido bridged defective dicubane tetranuclear Mn(ii) complexes

机译:罕见亩(3)-Chlorido和Mu(1,1,1) - 饱和桥面缺陷的二晶二核MN(II)复合物的催化活性和磁性行为

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Reaction of Mn(ii) salts with a flexidentate Mannich base ligand, N,N '-dimethyl-N,N '-bis(2-hydroxy-3-methoxy-5-methylbenzyl)ethylenediamine (H2L) in the presence of chloride or azide ions yielded two new tetranuclear complexes, [Mn4L2(mu(3)-Cl)(2)Cl-2] (1) and [Mn4L2(mu(1,1,1)-N-3)(2)(N-3)(2)] (2). Single crystal X-ray structural analyses reveal that these two discrete tetranuclear Mn(ii) complexes possess defective dicubane cores with two mu(3)-Cl (for 1) or two mu(1,1,1)-N-3 bridges (for 2). One of the triply bridging groups is situated above and the other one below the plane of the four Mn(ii) ions. In both complexes, all Mn(ii) ions are in a hexa-coordinated distorted octahedral environment. Both complexes 1 and 2 exhibit catecholase like activity and phenoxazinone synthase-like activity under ambient conditions. The turnover numbers (k(cat)) for the aerobic oxidation of 3,5-di-tert-butylcatechol are 1492.4 and 1431.2 h(-1) and those of o-aminophenol are 2265.5 and 2132.2 h(-1) for complexes 1 and 2, respectively. Mass spectral analyses were performed to get an idea about the probable mechanistic pathway for these catalytic reactions. Variable temperature magnetic susceptibility measurements of a solid sample reveal that both the complexes are antiferromagnetically coupled. The coupling constants are calculated to be J(1) = -0.19 cm(-1), J(2) = -6.87 cm(-1) and J(3) = -0.70 cm(-1) for 1 and J(1) = 0.11 cm(-1), J(2) = -0.64 cm(-1) and J(3) = 0.11 cm(-1) for 2 and these values are rationalized by DFT calculations.
机译:的Mn的反应(ii)与一flexidentate曼尼希碱配位体的盐,N,N“ - 二甲基 - N,N” - 双(2-羟基-3-甲氧基-5-甲基苄基)乙二胺(H2L)在氯的存在下或叠氮化物离子,得到两个新的四核配合物,[Mn4L2(亩(3)-Cl)(2)CL-2](1)和[Mn4L2(亩(1,1,1)-N-3)(2)(N -3)(2)](2)。单晶X-射线结构分析显示,这两个分立的四核锰(II)配合物具有缺陷dicubane芯具有两个亩(3)-Cl(1)或两个亩(1,1,1)-N-3桥(为2)。一个三重桥接基团的位于上方,而另一个的四个锰(II)离子的平面下方。在这两种络合物,所有的Mn(II)离子是在一个6配位的扭曲的八面体环境。两个配合物1和2表现出catecholase样活性和phenoxazinone合酶样在环境条件下的活性。的转换数(K(猫))为3,5-二 - 叔丁基儿茶酚的有氧氧化是1492.4和1431.2 H(-1)和那些邻氨基苯酚的是2265.5和2132.2 H(-1),1络合物和图2,分别。进行质谱分析,以获取有关这些催化反应的可能机理途径的想法。的固体样品的变温磁化率测量表明,无论是配合物反铁磁性耦合。耦合常数被计算为Ĵ(1)= -0.19厘米(-1),J(2)= -6.87厘米(-1)和J(3)= -0.70厘米(-1)1和J( 1)= 0.11厘米(-1),J(2)= -0.64厘米(-1)和J(3)= 0.11厘米(-1)2和这些值由DFT计算合理化。

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