| 研究生: |
張喬智 Chung, George |
|---|---|
| 論文名稱: |
含架橋配位基的銠(III)、銥(III)環金屬錯合物之光物理、電化學、密度泛函理論研究 Photophysical, Electrochemical and Density Functional Theory Studies of Cyclometalated Rhodium(III) and Iridium(III) Complexes Containing Bridge Ligands |
| 指導教授: |
黃福永
Huang, Fu-Yung |
| 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: | 2008 |
| 畢業學年度: | 96 |
| 語文別: | 中文 |
| 論文頁數: | 90 |
| 中文關鍵詞: | 銥(III)環金屬錯合物 、密度泛函理論 、銠(III)環金屬錯合物 、電化學 、光物理 |
| 外文關鍵詞: | Cyclometalated Rhodium(III) Complexs, Cyclometalated Iridium(III) Complexes, Density Functional Theory, Photophysical, Electrochemical |
| 相關次數: | 點閱:121 下載:1 |
| 分享至: |
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本研究主要是使用兩種架橋配位基,以2,3-bis(2-pyridiyl)-pyrazine (dpp)或是2,2'-bipyrimidine (bpym) 為架橋,合成不同的雙核環金屬錯合物,分別為[Ir2(ppy)4(dpp)]2+ (1)、[Rh2(ppy)4(dpp)]2+ (2)、[IrRh(ppy)4 -(dpp)]2+ (3)、[Ir2(ppy)4(bpym)]2+ (5)、[Rh2(ppy)4(bpym)]2+ (6)、[IrRh -(ppy)4(bpym)]2+ (7),及單核環金屬錯合物[Ir(ppy)2(dpp)]+ (4)、[Ir(ppy)2(bpym)]+ (8),此八種錯合之結構分別由 X-ray單晶結構及光譜鑑定之。光物理與電化學之性質也分別被研究,並藉由密度泛函理論計算,了解其軌域的組成。
我們發現在錯合物1~3、5~7中,改變金屬會同時改變HOMO及LUMO和氧化還原電位值,而吸收光譜則可觀察到MLCT也會隨著金屬置換而改變,在錯合物1、2中,架橋配位基上兩面角的大小會影響其還原電位。
The research performed in this work involved two kind of bridge ligands, 2,3-bis(2-pyridiyl)-pyrazine (dpp) and 2,2'-bipyrimidine (bpym). Dinuclear cyclometalated complexes of [Ir2(ppy)4(dpp)]2+ (1), [Rh2(ppy)4(dpp)]2+ (2), [IrRh(ppy)4(dpp)]2+ (3), [Ir2(ppy)4(bpym)]2+ (5), [Rh2(ppy)4(bpym)]2+ (6), and [IrRh(ppy)4(bpym)]2+ (7) and mononuclear cyclometalated complexes of [Ir(ppy)2(dpp)]+ (4) and [Ir(ppy)2(bpym)]+ (8) were synthesized with bridge ligand. The structure of these cyclometalated complexes were identified by X-ray diffraction crystallography and spectroscopic data. The photophysical and electrochemical properties were characterized. Density functional theory (DFT) calculations were also employed to study the orbital distribution.
It was found that the orbital energy of HOMO and LUMO, the electrochemical redox potential, and MLCT bands in UV-Vis absorption spectra.changed with ligands complexing to different metal. For complexes 1 and 2, the dihedral angle of bridge ligand was found to affect the reduction potential.
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