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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Kinetic studies on the reaction of NO with iron(II) complexes using low temperature stopped-flow techniques
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Kinetic studies on the reaction of NO with iron(II) complexes using low temperature stopped-flow techniques

机译:用低温停止流动技术对NO用铁(II)配合物的反应的动力学研究

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Low temperature stopped-flow techniques were used to investigate the reaction of three different iron(ii) complexes with nitrogen monoxide. The kinetic studies allowed calculation of the activation parameters from the corresponding Eyring plots for all three systems. The reaction of iron(ii) chloride with NO leading to the formation of MNIC(mononitrosyl-iron-complex) and DNIC (dinitrosyl-iron-complex) led to activation parameters of Delta H-double dagger= 55.4 +/- 0.4 kJ mol(-1)and Delta S-double dagger= 13 +/- 2 J K(-1)mol(-1) for MNIC and Delta H-double dagger= 32 +/- 6 kJ mol(-1)and Delta S-double dagger= -193 +/- 21 J K(-1)mol(-1) for DNIC. Formation of MNIC turned out to be much faster in comparison with DNIC. In contrast, activation parameters for the formation of monoculear [Fe(bztpen)(NO)](OTf)(2)(bztpen =N-benzyl-N,N ',N '-tris(2-pyridylmethyl)-ethylenediamine) Delta H-double dagger= 17.8 +/- 0.8 kJ mol(-1)and Delta S-double dagger= -181 +/- 3 J K(-1)mol(-1) supported an associative mechanism. Interestingly, [Fe(bztpen)(CH3CN)](OTf)(2) does not react with dioxygen at all. Furthermore, activation parameters of Delta H-double dagger= 37.7 +/- 0.7 kJ mol(-1) and Delta S-double dagger= -66 +/- 3 J K(-1)mol(-1)were obtained for the reaction of NO with the dinuclear iron(II) H-HPTB complex (H-HPTB =N,N,N ',N '-tetrakis(2-benzimidazolylmethyl)-2-hydroxy-1,3-diaminopropane), [Fe-2(H-HPTB)(Cl)(3)]. The kinetic data allowed postulation of the mechanisms for all of these reactions.
机译:使用低温停止流动技术来研究三种不同铁(II)配合物与氮一氧化物的反应。动力学研究允许计算所有三个系统的相应叶片图的激活参数。铁(II)氯化铁的反应不会导致曼(单胞亚硝基 - 铁)和DNIC(二硝基 - 铁 - 复合物)的形成导致了Delta H-Double Dagger = 55.4 +/- 0.4 kJ摩尔的激活参数(-1)和Delta S-Double Dagger = 13 +/- 2 JK(-1)Mol(-1)用于MniN和Delta H-Double Dagger = 32 +/- 6 KJ Mol(-1)和Delta S-双匕首= -193 +/- 21 JK(-1)MOL(-1)用于DNIC。与DNIC相比,形成营地的形成要快得多。相反,用于形成单缔膜浆性[Fe(BZTPEN)(NO)](OTF)(2)(BZTPEN = N-苄基-N,N',N'-三甲基(2-吡啶基甲基) - 乙二胺)δ的激活参数H-Double Dagger = 17.8 +/- 0.8 KJ Mol(-1)和Delta S-Double Dagger = -181 +/- 3 JK(-1)Mol(-1)支持联想机制。有趣的是,[Fe(BZPEN)(CH3CN)](OTF)(2)根本不会与二恶英反应。此外,获得了δH-Double Dagger = 37.7 +/- 0.7kJMol(-1)和Delta S-Double Dagger = -66 +/- 3Jk(-1)mol(-1)的激活参数,反应NO用二核铁(II)H-HPTB络合物(H-HPTB = N,N,N',N'-Tetrakis(2-苯并咪唑基甲基)-2-羟基-1,3-二氨基丙烷),[Fe-2 (H-HPTB)(CL)(3)]。动力学数据允许假设所有这些反应的机制。

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