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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/83293

    Title: 新型多光子染料與鋰電池導電材料的開發;Development of Novel Multiphoton Chromophores and New Conducting Materials for Lithium Batteries
    Authors: 湯發皓;TANG, FA-HAO
    Contributors: 化學學系
    Keywords: 三氮唑吡啶;triazolopyridine
    Date: 2020-08-20
    Issue Date: 2020-09-02 15:19:49 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本論文成功合成出兩個系列的模型分子,第一系列為含三氮唑吡啶(triazolopyridine)和苯並噻唑(benzothiazole)結構單元之不對稱型分子;第二系列為含difluorenoindenophenazine之多環芳香烴模型分子。透過線性光學性質的測量,可以得知模型分子之最大吸收波長、最大放射波長、螢光量子產率與螢光生命期。非線性光學實驗則是以可調整波長之飛秒脈衝式雷射作為激發光源,利用量測螢光強度對激發光強之依賴性來證實這些模型分子皆具有雙光子與三光子吸收性質。另外這些模型分子的雙光子與三光子激發光譜則是使用螢光比較法測得。經分析光學性質與分子結構間的關聯性,我們可歸納出以下結論:
    (1) 以D-π-A形式組成之第一系列不對稱條型模型分子,具有良好的螢光量子產率與明顯之溶劑效應且當其溶於極性溶劑下時皆具有較長的螢光生命期。
    (2) 在含三氮唑吡啶(triazolopyridine)和苯並噻唑(benzothiazole)為結構單元的模型分子中,若在分子結構中再加入fluorene單元或碳-碳參鍵以增加整體分子的共軛長度,可有效增加分子的雙光子與三光子吸收效率。
    (3) 相較於三氮唑吡啶(triazolopyridine),若以苯並噻唑(benzothiazole)作為拉電子基團,可使分子整體具有較高之雙光子與三光子吸收效率。
    (4) 在含多環芳香烴之模型分子中,若以difluorenoindenophenazine為結構單元來增加整體分子之共平面性,可使螢光放射波長紅移與增長其螢光生命期,但螢光量子產率與雙光子吸收效率會有明顯下降的趨勢。此結果說明增加分子共平面性的方式與延伸共軛結構的方向皆可能嚴重影響分子多光子吸收能力的增減。
    (5) 分析第一系列模型分子之吸收級數光譜,可觀察到分子由雙光子轉變為三光子吸收的完整過程,從中發現若在分子結構中再加入fluorene單元或碳-碳參鍵以增加整體分子的共軛長度,將會縮短分子由雙光子轉變為三光子吸收的光譜跨幅。
    ;Two model compound systems are designed and synthesized in this Thesis. The first model system is composed of five congeners using fluorene, triazolopyridine and benzothiazole as the major building units to construct D-π-A type dye molecules. The second model system is derived from difluorenoindenophenazine unit, which is featured by its polycyclic aromatic character. We have performed various linear and nonlinear optical property measurements and some of the features about the relationship between molecular structure and optical properties should be noted:
    (1) The D-π-A type dyes in the first model system exhibit high fluorescence quantum yields and salient solvatochromism. The fluorescence lifetimes of these chromophores are found to be longer in polar solvents.
    (2) Introducing additional fluorene and/or ethynyl groups into the above-mentioned D-π-A system can efficiently promote the molecular two-photon and three-photon activities.
    (3) Compared to triazolopyridine, benzothiazole is a better two-photon and three-photon activity promoter if introduced as an electron-acceptor in our model compound set.
    (4) The manner and the direction of extending the π-conjugation could be essential for the resulting magnitudes of molecular two-photon absorptivities.
    (5) The order of the absorption process spectra (OAP-spectra) have provided information about the spectral dispersion of two-photon absorption (2PA), three-photon absorption (3PA) as well as the co-existence region for 2PA and 3PA. It is found from the first model system that those dye structures with additional fluorene and/or ethynyl unit manifest comparatively narrower coverage of spectral region for the co-existence of 2PA and 3PA.
    In addition, we also carried out a project of developing materials that may be applicable for the electrolytes in lithium battery. The project is funded by the Industrial Technology Research Institute (ITRI, Taiwan). Some preliminary results are included in this Thesis.
    Appears in Collections:[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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