| 研究生: |
陳崑源 Chen, Kun-Yuan |
|---|---|
| 論文名稱: |
釩三價化合物在多硫配位環境的配位化學 Coordination chemistry of V(III) complexes in S-rich ligation environment |
| 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: | 60 |
| 中文關鍵詞: | 釩三價化合物 、多硫配位環境 |
| 外文關鍵詞: | V(III) complexes |
| 相關次數: | 點閱:54 下載:2 |
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我們實驗室一直很有興趣去研究釩在多硫配位環境下的化學性質,我們也努力去瞭解釩固氮酵素,釩固氮酵素可催化氮氣還原成氨。而根據一些光譜上的研究,已有文獻報導在釩固氮酵素中的釩部位,是鍵結三個硫原子和一個檸檬酸,以及一個組氨酸。然而,釩固氮酵素的釩部位在鍵結固氮作用的受質與還原反應上扮演的是什麼樣的角色,目前仍然是很模糊的。為了瞭解釩固氮酵素中釩所扮演的角色,特別是在多硫配位環境下的釩,因此有必要去充分瞭解釩的化學性質。
在這樣的動機之下,引領我們去合成了一系列的釩三價化合物,而這些化合物是以釩三價離子鍵結四芽的配位基PS3、PS3’以及一些單芽或是雙芽的配位基,因而得到了六配位的[V(PS3’)(2,2’-bipy)] (1)和七配位的[VPS3(1-Me-Im)3] (2),而在這之前,我們實驗室已經得到一些五配位的化合物V(PS3)L (L = Im, 1-Me-Im)。在本論文裡,我們詳細說明了五、六、七配位化合物的合成、結構特徵以及光譜性質。另外,為了比較在多硫配位環境的釩三價化合物和氮、氧配位環境下的釩三價化合物之間的差異,我們也合成了Na[V(edta)(H2O)] •3H2O (3),並利用光譜研究不同配位環境的釩三價化合物之間的不同。
In our effort to understand vanadium nitrogenase, we have been interested in studying vanadium chemistry in a sulfur-rich ligation environment.
Vanadium nitrogenase catalyzes the reduction of dinitrogen to ammonia. According to spectroscopic studies, it has been proposed that the vanadium site in vanadium nitrogenase binds to three sulfides, a homocitrate and a histidine. However, it is still obscure how the vanadium site plays a role for substrate binding and reduction. To provide the insights for the role of vanadium in vanadium nitrogenase, it is essential to have a fully understanding of vanadium chemistry, particularly, in a sulfur-rich ligation environment.
This led us to synthesize a series of vanadium(III) complexes, in which the V(III) ion is coordinated by a tetradentate tris(thiolato)phosphine ligand and other mondentate and bidentate ligands. They are 6- and 7-coordinate complexes, [V(PS3’)(2,2’-bipy)] (1), and [VPS3(1-Me-Im)3] (2), respectively. Previously, our laboratory has also obtained some five-coordinate complexes, V(PS3)L (L = Im, 1-Me-Im). In the dissertation, we detail the syntheses, structural characterization, as well as spectroscopic properties of these 5-, 6-, and 7-coordinate complexes. In addition, a reported V(III) complex with a N and O ligated environment, Na[V(edta)(H2O)] •3H2O (3), was also synthesized and studied by spectroscopies in order to compared V(III) complexes in S-rich liagtion environment.
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