ヒドロゲナーゼ活性中心のモデル構築をめざしたニッケルー鉄二核錯体の合成と反応

镍铁双核配合物的合成与反应旨在构建氢化酶活性中心模型

基本信息

批准号：
15F15035
负责人：
巽和行
金额：
$ 1.47万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2015
资助国家：
日本
起止时间：
2015-04-24 至 2017-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15F15035/
关键词：
Hydrogenase Iron Nickel Bimetallic Thiolates Hydride

项目摘要

For the purpose to elucidate the dihydrogen activation process mediated by [NiFe] hydrogenase, I was engaged in the model study of plausible intermediates associated during catalysis by the enzyme. A series of new heterobimetallic dithiolate-bridged Ni-Fe(carbonyl/cyanide) complexes, [(18-Crown-6)K]2[(CO)(CN)2Fe(pdt)Ni(CO)(PPh3)] (1; pdt = propane-1,3-dithiolate), [(18-Crown-6)K]2[(CO)(CN)2Fe(ndt)- Ni(CO)(PPh3)] (2; ndt = norborane-exo-2,3-dithiolate), and the m-hydride complex [(18-Crown-6)K][(CN)(CO)2Fe(pdt)(mu-H)- Ni(CN)(PCy3)] (3), were synthesized as models of the different states named Ni-L and Ni-R states. The Fe(II)-Ni(0) complexes 1 and 2 were synthesized by the reaction of Ni(PPh3)4 with Fe(II) thiolato complexes [(CO)2(CN)2Fe(pdt)](2-) and [(CO)2(CN)2Fe(ndt)](2-), respectively. The mu-hydride complex 3 was obtained via a similar reaction of the Fe(II) thiolato complex with Ni(II)-hydride complex Ni(H)(Cl)(PCy3)2. Complexes 1 and 2 has Ni-Fe distances of ~2.5 A, and thus they serve as the novel synthetic model complexes native Ni-L state and Ni center retain tetrahedral geometry. The mu-hydride bimetallic complex 3 with Ni-Fe distance ~2.6 A represents the very important intermediate model complex in the catalytic cycle of [Ni-Fe] hydrogenase termed as Ni-R state where Fe is coordinated by CO/CN and the Ni possesses a distorted tetrahedral geometry. While a model complex having CN ligand protected with Lewis acid was reported by Rauchfuss, complex 3 is the first Ni-Fe (CO/CN) mu-hydride complex.

为了阐明[Nife]氢化酶介导的二氢激活过程，我参与了酶在催化过程中相关的合理中间体的模型研究。一系列新的杂质二硫酸二硫酸二硫酸氢酯（羰基/氰化物）配合物，[（18-克罗恩-6）k] 2 [（CO）（CN）（CN）2FE（PDT）Ni（co）Ni（co）（PPH3）（PPH3） [(18-Crown-6)K]2[(CO)(CN)2Fe(ndt)- Ni(CO)(PPh3)] (2; ndt = norborane-exo-2,3-dithiolate), and the m-hydride complex [(18-Crown-6)K][(CN)(CO)2Fe(pdt)(mu-H)- Ni(CN)(PCy3)] (3), were合成为名为Ni-L和Ni-R状态的不同状态的模型。 Fe（ii）-Ni（0）复合物1和2通过Ni（PPH3）4与Fe（II）硫醇复合物[（CO）2（CN）2FE（PDT）]（2-）]（2-）和[（CO）2（CO）2（CN）2（CN）2FE（NDT）2FE（NDT）]（2FE（NDT）]（2-fe）合成。 Mu-Hydride复合物3是通过Fe（II）硫醇复合物与Ni（II） - 氢化物复合物Ni（H）（Cl）（Cl）（PCY3）2的类似反应获得的。复合物1和2具有〜2.5 a的Ni-Fe距离，因此它们充当新型的合成模型复合物，将天然的Ni-L状态和Ni中心保留四面体几何形状。 Ni-Fe距离〜2.6 a的Mu-Hydride双金属复合物3代表[Ni-Fe]氢化酶的催化循环中非常重要的中间模型复合物，称为Ni-R态，其中Fe由CO/CN协调，Ni具有变形的四面体几何。尽管Rauchfuss报道了具有Lewis Acid的CN配体的模型复合物，但复合物3是第一个Ni-Fe（CO/CN）Mu-Hydride复合物。