| 研究生: |
王榮慶 Wang, Rong-Ching |
|---|---|
| 論文名稱: |
合成與描述以Tri(thiolate)phosphine為配位基的釩(III、IV)化合物 Synthesis and characterization of Vanadium(III、IV)complexes of Tri(thiolate)phosphine ligands |
| 指導教授: |
許鏵芬
Hsu, Hua-Fen |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 159 |
| 中文關鍵詞: | 釩三價 、釩固氮酵素 、四價的非含氧的釩化合物 、催化N3- 、多硫配位環境 、釩 |
| 外文關鍵詞: | Vanadium, S-rich coordination environment, Vanadium nitrogenase catalyzes nitrogen fixation, catalytic reactivity of the reduction of azide |
| 相關次數: | 點閱:95 下載:2 |
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釩在生物體中扮演著非常重要的角色,例如釩固氮酵素(V-nitrogenase)可以催化自然界中的固氮反應,使氮氣還原成氨氣,另外某些釩化合物具有取代胰島素治療糖尿病的潛能,但是到目前為止,科學家們對於釩固氮酵素的反應機制以及釩化合物可以治療糖尿病的藥物機轉尚不清楚。
而因為釩固氮酵素中的釩部分具有多硫配位環境,且釩化合物治療糖尿病的藥物機轉可能與釩化合物和Protein Tyrosine Phosphatases(PTP)中的cysteine作用有關,因此本研究主要想了解釩化合物在多硫配位環境的化學及物理性質,希望藉此來幫助了解釩固氮酵素以及釩化合物治療糖尿病藥物的機制。
在研究中,我們利用固氮酵素的受質N3-,與釩在有多硫配位環境的配位基[PS3]H3反應並成功的合成出第一個釩三價在多硫環境下與N3-所形成的化合物[(C3H7)4N][VIII(PS3)N3] (1)。此外,我們也研究利用[VIII(PS3”)Cl]-來催化N3-的還原反應。我也合成出文獻中極少見的非含氧的釩四價多硫配位環境的七配位化合物,[PPh4][VIV(PS3’’)(PS3’’SH)] (2)與[VIV(PS3’’)(PS2’’)(S-C-S)] (3),這兩個少見的化合物提供我們在對四價的非含氧的釩化合物之討論與研究許多寶貴的資訊。
在此論文中,將詳細的介紹化合物1、2、3的合成方法與反應、各種光譜的性質以及和文獻上類似化合物的比較結果。
Vanadium plays important roles in biology and medicine. For instance, vanadium containing nitrogenase (V-nitrogenase) catalyzes the reduction of dinitrogen to ammonia. Some vanadium compounds such as VIVO-bis(maltolato), VIVO-bis(acetylacetonato) and VV-dipicolinato were found to replace insulin for treating type II diabetes.
The mechanism of vanadium nitrogenase catalyzes nitrogen fixation is still obscure. How vanadium compounds can treat diabetes is also not well understood. According to the spectroscopic studies, vanadium site in V-nitrogenase has a S-rich coordination environment. It has been reported that the mechanism of vanadium insulin mimics might be related to the interaction of vanadium compound with the cystein residue of protein tyrosine phosphatase (PTP). Thus, it is very important to have a fully understanding for the chemistry of vanadium compounds, particularly, in sulfur-rich ligation environment. In this research, we use polythiolate ligands, and [PS3]H3 (P(C6H4-2-SH)3), [PS3’]H3 (P(C6H3-5-Me-2-SH)3), and[PS3”]H3 (P(C6H3-3-SiMe3-2-SH)3) as a title ligand for reacting with VIII species. We obtained [(C3H7)4N][VIII(PS3)N3] (1), [PPh4][VIV(PS3”)(PS3”SH)] (2) and [VIV(PS3”)(PS3”S-C-S)] (3). Compound 1 is the first example of V(III) species binding to an N3- ion, an alternate substrate of nitrogenase. In addition, the catalytic reactivity of the reduction of azide by [VIII(PS3”)Cl]- was also investigated. [PPh4][VIV(PS3”)(PS3”SH)] (2) and [VIV(PS3”)(PS3”S-C-S)] (3) represent rare examples of seven-coordinate nonoxovanadium(IV) compounds. In this dissertation, we will detail the syntheses, structural characterization, reactivities, spectroscopies of these compounds.
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