研究生: |
陳喧應 Hsuan Ying Chen |
---|---|
論文名稱: |
聯吡啶釕錯合物的性質研究 The study of Ruthenium(II) tris(dipyridyl) complexes |
指導教授: |
張一知
Chang, I-Jy |
學位類別: |
碩士 Master |
系所名稱: |
化學系 Department of Chemistry |
論文出版年: | 2001 |
畢業學年度: | 89 |
語文別: | 中文 |
論文頁數: | 141 |
中文關鍵詞: | 聯吡啶 、釕 |
英文關鍵詞: | bipyridine, Ruthenium |
論文種類: | 學術論文 |
相關次數: | 點閱:202 下載:0 |
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中文摘要
本論文中採用不同取代基的聯啶和含酸基的聯啶與釕金屬結合為化合物Ru(phen)2(mcbpy)2+,Ru(tmbpy)2(mcbpy) 2+,Ru(dmbpy)2(mcbpy) 2+,Ru(bpy)2(mcbpy) 2+,Ru(dnbpy)2(mcbpy) 2+,Ru(bpy)2(tmcbpy) 2+,Ru(dcbpy)2(mcbpy) 2+,Ru(dcbpy)2(tmcbpy) 2+,並分析其基態與激發態的電子密度分佈,以及影響電子分佈的因素為何。
透過錯合物在電子躍遷光譜上MLCT 吸收帶的吸收度對酸鹼值做圖,就可得到基態的解離平衡常數。以錯合物所測3MLCT 冷光光譜的冷光強度對酸鹼值做圖,可得到其反折點,再測得錯合物在質子化與去質子化兩者的生命期加以校正,就可得到錯合物激發態的pKa*值。錯合物的酸解離常數在激發態與基態的差值ΔpKa (pKa*-pKa) 越大代表錯化合物在激發態比基態更具鹼性,也就是說,錯合物在激發態有較多的電子密度是分佈在含酸基的聯啶上。越小代表錯化合物在激發態有較少的電子密度是分佈在含酸基的聯啶上。
實驗結果得到ΔpKa各為0.95 (Ru(phen)2(mcbpy) 2+), 0.93 (Ru(tmbpy)2(mcbpy) 2+),0.71 (Ru(dmbpy)2(mcbpy) 2+),0.27 (Ru(bpy)2(mcbpy) 2+),0.02 (Ru(dnbpy)2(mcbpy) 2+),-0.287(Ru(bpy)2(tmcbpy) 2+),-3.55 (Ru(dcbpy)2(mcbpy) 2+),-3.57 (Ru(dcbpy)2(tmcbpy) 2+)。結果以Ru(phen)2(mcbpy) 2+的電子由釕金屬轉移到含酸基聯啶的效益最好。以Ru(dcbpy)2(tmcbpy)的電子由釕金屬轉移到含酸基聯啶的效益最差。
Abstract
Ruthenium(II) tris(dipyridyl) complexes have been synthesized. By varying the electron-withdrawing and electron-donating abilities on each bipyridyl ligand, we have made eight complexes that contain at least one 4-carboxyl-4’-methy,2’-bipyridine or 4-carboxyl-3,3’4,’-trimethy,2’-bipyridine. These complexes are Ru(phen)2(mcbpy)2+, Ru(tmbpy)2(mcbpy) 2+, Ru(dmbpy)2(mcbpy) 2+, Ru(bpy)2(mcbpy) 2+, Ru(dnbpy)2(mcbpy) 2+, Ru(bpy)2(tmcbpy) 2+, Ru(dcbpy)2(mcbpy) 2+, Ru(dcbpy)2(tmcbpy) 2+.
The ground-state acid dissociation constant (pKa) were obtained from the titration curve of absorption changes. The excited-state acid dissociation constant (pKa*) were obtained from the luminescence titration curve and lifetime calibration. A positive ΔpKa (ΔpKa = pKa* - pKa) indicates the electron density of the bipyridine that contains the carboxyl group has a higher electron density in the excited state than the ground state. A negative ΔpKa indicates the carboxyl containing bipyridine has less electron density in the excited state . From the acid dissociation constant studies, the electron density in the excited state of Ruthenium(II) tris(dipyridyl) complexes can be qualitatively mapped.
The experiment data forΔpKa are 0.95, 0.93, 0.71, 0.27, 0.02, -0.87, -3.55 and -3.57 for Ru(phen)2(mcbpy) 2+, Ru(tmbpy)2(mcbpy) 2+, Ru(dmbpy)2(mcbpy) 2+, Ru(bpy)2(mcbpy) 2+, Ru(dnbpy)2(mcbpy) 2+, Ru(dcbpy)2(mcbpy) 2+, Ru(bpy)2(tmcbpy) 2+ and Ru(dcbpy)2(tmcbpy) 2+, respectively. The results indicate that if it is desired to have higher electron density in the excited state on the carboxyl containing bipyridine, [Ru(phen)2(mcbpy)] is the best choise. On the other hand, if carboxyl containing bipyridine is designated to have less electron density in the excited state , [Ru(dcbpy)2(tmcbpy)] is the best candidate.
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