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Heterodinuclear nickel(ii)–iron(ii) azadithiolates as structural and functional models for the active site of [NiFe]-hydrogenases

机译:异二核镍(II)-Iron(II)硫酸盐酸盐作为[NiFe] - 氢酶的活性位点的结构和功能模型

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To develop the biomimetic chemistry of [NiFe]-H _(2) ases, the first azadithiolato-bridged NiFe model complexes [CpNi{(μ-SCH _(2) ) _(2) NR}Fe(CO)(diphos)]BF _(4) ( 5 , R = Ph, diphos = dppv; 6 , 4-ClC _(6) H _(4) , dppv; 7 , 4-MeC _(6) H _(4) , dppv; 8 , CO _(2) CH _(2) Ph, dppe; 9 , H, dppe) have been synthesized via well-designed synthetic routes. Thus, treatment of RN[CH _(2) S(O)CMe] _(2) with t -BuONa followed by reaction of the resulting intermediates RN(CH _(2) SNa) _(2) with (dppv)Fe(CO) _(2) Cl _(2) or (dppe)Fe(CO) _(2) Cl _(2) gave the N-substituted azadithiolato-chelated Fe complexes [RN(CH _(2) S) _(2) ]Fe(CO) _(2) (diphos) ( 1 , R = Ph, diphos = dppv; 2 , 4-ClC _(6) H _(4) , dppv; 3 , 4-MeC _(6) H _(4) , dppv; 4 , CO _(2) CH _(2) Ph, dppe). Further treatment of 1–4 with nickelocene in the presence of HBF _(4) ·Et _(2) O afforded the corresponding N-substituted azadithiolato-bridged NiFe model complexes 5–8 , while treatment of 8 with HBF _(4) ·Et _(2) O resulted in formation of the parent azadithiolato-bridged model complex 9 . While all the new complexes 1–9 were characterized by elemental analysis and spectroscopy, the molecular structures of model complexes 6–8 were confirmed by X-ray crystallographic study. In addition, model complexes 7 and 9 were found to be catalysts for H _(2) production with moderate i _(cat) / i _(p) and overpotential values from TFA under CV conditions.
机译:开发[NiFe] -H _(2)ases的仿生化学,第一个azadithiolato - 桥接NiFe模型复合物[cpni {(μ-sch _(2))_(2)nr} fe(co)(diphos) ] BF _(4)(5,R = pH,Diphos = DPPv; 6,4-Clc _(6)H _(4),DPPV; 7,4-MEC _(6)H _(4),DPPV ; 8,通过精心设计的合成路线合成了CO _(2)CH _(2)pH,DPPE; 9,H,DPPE)。因此,用T-Buona处理RN [CH _(2)S(O)CME] _(2),然后得到所得中间体RN(CH _(2)SNA)_(2)的反应(DPPV)FE (CO)_(2)CL _(2)或(DPPE)Fe(CO)_(2)Cl _(2)得到N-取代的四硫醇酸螯合的Fe络合物[RN(CH _(2))_ (2)] Fe(CO)_(2)(DIPHOS)(1,R = pH,DIPHOS = DPPV; 2,4-CLC _(6)H _(4),DPPV; 3,4-MEC _( 6)H _(4),DPPV; 4,CO _(2)CH_(2)pH,DPPE)。在HBF _(4)·ET _(2)℃存在下,用镍烯进一步处理1-4,得到相应的N-取代的四硫醇桥桥桥5-8,同时用HBF _(4)处理8 ·ET _(2)o导致母体阿辛吡啶桥桥模型复合物的形成。虽然所有新的复合物1-9的特征在于元素分析和光谱,通过X射线晶体研究证实了模型复合物6-8的分子结构。另外,发现模型复合物7和9是H _(2)产生的催化剂,其具有中等I _(CAT)/ I _(P)和来自CV条件下的TFA的过电值。

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