As models of [FeFe]-H₂ases, a series of aminodiphosphine ligands (Ph₂P)₂NR (PNP) bridged Fe/E (E = S and Se) compounds (1-6) have been prepared. Thus, treatment of Fe₂(C₆H₅CH₂S)₂(CO)₆ with PNP ligands (Ph₂P)₂NR (R = C₆H₅CH₂ and C₆H₄^tBu-4) in refluxing xylene gave the PNP-substituted butterfly [2Fe2S] compounds Fe₂(C₆H₅CH₂S)₂(CO)₄{(µ-Ph₂P)₂NR} (R = C₆H₅CH₂ 1 and C₆H₄^tBu-4 2). However, if Fe₂(C₆H₅CH₂Se)₂(CO)₆ is used instead of Fe(C₆H₅CH₂S)₂(CO)₆ to react with (Ph₂P)₂NR ligands under similar conditions, two unexpected compounds Fe₂(µ-Se)₂(CO)₄{(µ-Ph₂P)₂NR} (R = C₆H₅CH₂ 5 and C₆H₄^tBu-4 6) can be isolated besides the target Se analogs Fe₂(CH₂C₆H₅Se)₂(CO)₄{(µ-Ph₂P)₂NR} (R =C₆H₅CH₂ 3 and C₆H₄^tBu-4 4), two C-Se bonds are cleaved resulting in a closed Fe₂Se₂ core. All the new compounds were characterized by elemental analysis, FT-IR, NMR spectroscopy, and particularly for 1-5 by X-ray diffraction analyses. In addition, a comparative study on the electrochemical and electrocatalytic properties of two representative targeted compounds 1 and 3 were studied in the absence and presence of weak acid (CH₃CO₂H) as proton source by cyclic voltammetry (CV).

由于模型[FEFE] -H _2个ASES，一系列氨基二膦配位体的（PH ₂ P）₂ NR（PNP）的Fe桥接/ E（E = S和Se）的化合物，（1 - 6）已经被制备。因此，用PNP配体（Ph ₂ P）₂ NR（R = C ₆ H ₅ CH ₂和C ₆ H ₄ ^t Bu-4）处理Fe ₂（C ₆ H ₅ CH ₂ S）₂（CO）₆。回流二甲苯得到PNP取代的蝶形[2Fe2S]化合物Fe ₂（C ₆ħ ₅ CH ₂ S）₂（CO）₄ - {（μ-PH ₂ P）₂ NR}（R = C ₆ H ^ ₅ CH ₂ 1和C ₆ H ^ ₄^吨卜-4 2）。但是，如果使用Fe ₂（C ₆ H ₅ CH ₂ Se）₂（CO）₆代替Fe（C ₆ H ₅ CH ₂ S）₂（CO）₆与（Ph ₂ P）_2反应在相似条件下的NR配体，两个意外化合物Fe ₂（µ-Se）₂（CO）₄ {（µ-Ph ₂ P）₂ NR}（R = C ₆ H ₅ CH ₂ 5和C ₆ H ₄ ^t Bu- 4 6）可以除了目标硒类似物的Fe被分离₂（CH ₂ C ^ ₆ ħ ₅硒）₂（CO）₄ - {（μ-PH ₂ P）₂ NR}（R = C ₆ H ^ ₅ CH ₂ 3和C ₆H ₄ ^t Bu-4 4），两个C-Se键断裂，形成封闭的Fe ₂ Se ₂核。通过元素分析所有的新化合物进行了表征，FT-IR，NMR波谱法，特别是对于1 - 5由X射线衍射分析。此外，通过循环伏安法（CV）在不存在和存在弱酸（CH ₃ CO ₂ H）作为质子源的情况下，对两种代表性目标化合物1和3的电化学和电催化性能进行了比较研究。