| 研究生: |
朱偉正 Chu, Wei-Cheng |
|---|---|
| 論文名稱: |
釩固氮酵素的模型化合物 Model Compounds for Vanadium Nitrogenase |
| 指導教授: |
許鏵芬
Hsu, Hua-Fen |
| 學位類別: |
博士 Doctor |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2010 |
| 畢業學年度: | 98 |
| 語文別: | 中文 |
| 論文頁數: | 114 |
| 中文關鍵詞: | 固氮酵素 、固氮菌 、鉬-固氮酵素 、釩-固氮酵素 、鐵蛋白質 、鉬-鐵蛋白質 、金屬蛋白質 、鐵-鉬輔酶 、鐵-釩輔酶 |
| 外文關鍵詞: | nitrogenase, molybdenum nitrogenase, vanadium nitrogenase, Fe-protein, Mo-Fe protein, Fe-Mo cofactor, Fe-V cofactor |
| 相關次數: | 點閱:74 下載:5 |
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在這份研究中,一系列不同配位數(5、6和7配位)包含PS3配位基(PS3= tris(2-thiophenyl)phosphine的三價陰離子與苯環上不同取代基的衍生物)的釩三價化合物被製備與結構鑑定。這些錯合物的通式為[V(PS3)Ln]0,-,當n=1( L = Cl-、 1-Me-Im、N3-),n=2(L =2,2’-bpy,該配位基為雙芽基)和n=3 ( L = 1-Me-Im, N2H4)。我們也研究了化合的直流(DC)磁化率和高頻率高磁場電子順磁共振的研究。除此之外,我們發現在常溫常壓下[V(PS3”)Cl]-(1)可以在分別以CoCp2(或Na/Hg)和2,6-LutHCl作為電子和質子來源的情況下催化聯胺(N2H4)產生氨氣(NH3)(Eq1)。再者,[V(PS3”)Cl]-在CH3CN溶劑中也可以分別以 [LutH][BAr’4] (LutH = 2,6-lutidinium and Ar’ = 3,5-(CF3)2C6H3))和 CoCp*2作為質子與電子來源的情況下催化二亞胺(N2H2)產生氨氣(NH3)(Eq2),在最佳條件下可催化8-9當量的二亞胺(N2H2)。以[V(PS3”)Cl]-催化還原聯胺(N2H4)和二亞胺(N2H2)產生氨氣(NH3)的化學性質與可能的反應機構將詳細的被描述。
N2H4 + 2e- + 2H+ → 2NH3 (Eq1)
N2H2 + 4e- + 4H+ → 2NH3 (Eq2)
At this work, a series of V(III) complexes of varying coordination number (5, 6, and 7) all containing the PS3 ligand (PS3 = trianion of tris(2-thiophenyl)phosphine and its derivatives with other phenyl substituents) has been prepared and structurally characterized. The complexes have general formula [V(PS3)Ln]0,-, where n =1 (from L = Cl-, 1-Me-Im,N3-), 2 (from L =2,2’-bpy; counting each N of the bidentate ligand), and 3 (from L = 1-Me-Im, N2H4). The complexes have also been
investigated by direct current (DC) magnetic susceptibility and high-frequency and -field electron paramagnetic resonance(HFEPR).
Besides, we observed that [V(PS3”)Cl]-(1)can catalyze the reduction of hydrazine to ammoniain at ambient temperature and pressure in the presence of CoCP2 (or Na/Hg) and [2,6-LutH]Cl (where LutH = 2,6-lutidinium) as external electron and proton sources, respectively (shown in Eq1). Furthermore, [V(PS3”)Cl]- also can catalyze reduction of diazene to ammoniain in CH3CN with the presence of [2,6-LutH][BAr’4] (where LutH = 2,6-lutidinium and Ar’ = 3,5-(CF3)2C6H3)) and CoCp*2 (CoCp*2 = decamethyl cobaltocene) as external proton and electron sources, respectively, to give the optimal turnover number (approximate 8-9) (shown in Eq2). The detail chemistry as well as possible pathways for the reduction of N2H4 and N2H2 by [V(PS3”)Cl]- will be described.
N2H4 + 2e- + 2H+ → 2NH3 (Eq1)
N2H2 + 4e- + 4H+ → 2NH3 (Eq2)
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校內:2015-08-30公開