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研究生： 亞努納
Anurach Poloek
論文名稱： Synthesis, Characterization and Liquid Crystalline Properties of Platinum(II) Complexes
指導教授： 季昀
Chi Yun
口試委員:
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： 英文
論文頁數： 103
中文關鍵詞： 液晶
外文關鍵詞： Liquid crystalline
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    • The synthesis and mesomorphic properties of a new platinum(II) complexes with a formula [Pt(N^N)2] in which containing pyridylpyrazolate (complexes 1a-1d and 2), isoquinolylpyrazolate (complexes 3a-3b and 4) and pyridyltriazolate (complexes 5a-5b). The disc-like Pt(II) complexes (1a, 3a and 4) exhibited columnar hexagonal mesophases, which were characterized by DSC analysis and optical polarized microscopy. The structure of the mesophases was confirmed by X-ray powder diffraction (XRD). Single-crystal X-ray diffraction studies of 1a and 3b reveal the difference in the arrangement of the molecules. Complex 1a showed a columnar stacking with the molecules oriented in an alternating order, while complex 3b formed a columnar stacking of superimposed monomeric units. Complexes 1a-1c and 5a-5b display negative solvatochromic luminescence, which attributed to a common charge-transfer-to-pyridyl excited state. A Red-Polarized phosphorescent OLED device with multilayer configuration of ITO/rubbed PEDOT/F(MB)5:16%1a/TPBI/LiF/Al were fabricated using F(MB)5 layer doped with 16% of complex 1a. The device showed a red emission with λmax at 621nm. The device has a luminance of 150 cd m2 at 15 V and a maximum efficiency of 0.3 cd/A. The threshold voltage is 7 V. The polarization direction of phosphorescence is perpendicular to the rubbing direction. Both PL and EL dichroic ratios are about 2x (vertical/parallel).

    LIST OF CONTENTS Page Chapter 1 Introduction ………………………………………………… 1 1.1 Definition of Liquid crystals ……………………………….. 1 1.2 Classification of Liquid crystals …………………………… 2 1.3 Mesophase characterization ………………………………... 8 1.3.1 Polarizing Optical Microscopy (POM) ……………. 9 1.3.2 Differential Scanning Calorimetry (DSC) ………… 10 1.3.3 X-Ray Diffraction (XRD) …………………………. 11 1.4 Applications ………………………………………………... 12 1.4.1 Liquid crystal displays …………………………….. 12 1.4.2 Liquid crystal thermometers ………………………. 14 1.4.3 Optical imaging ……………………………………. 15 1.4.4 Other liquid crystal applications …………………... 15 1.5 Metallomesogens …………………………………………... 1 5 1.6 Early work on metallomesogens …………………………… 16 Chapter 2 Experimental Section ………………………………………. 19 2.1 General Experimental Details ……………………………… 19 2.2 Synthesis of trialkoxyacetophenone and dialkoxyacetophenone ……………………………………… 20 2.3 Synthesis of Ligands ……………………………………….. 27 2.3.1 Pyrazolate Ligands ………………………………… 27 2.3.2 Triazolate Ligands …………………………………. 36 2.4 Synthesis of Pt(II) Complexes ……………………………... 39 Chapter 3 Results and discussion ……………………………………… 51 3.1 Synthesis and Physical properties ………………………….. 51 3.2 Liquid crystalline properties ……………………………….. 54 3.2.1 Differential scanning calorimetry (DSC) ………….. 54 3.3.2 Polarized optical microscopy (POM) ……………… 56 3.3.3 Powder X-ray diffraction (XRD) ………………….. 58 3.3.4 Single crystal X-ray diffraction ……………………. 61 3.3 Spectroscopic Properties …………………………………… 68 3.4 OLED Fabrication ………………………………………….. 75 Chapter 4 Conclusions ………………………………………………… 79 References ………………………………………………….. 80 Chapter 5 Platinum(II) with Tridentate ligands ……………………….. 83 Introduction ………………………………………………… 83 Experimental Section ………………………………………. 84 Results and Discussion ……………………………………... 90 References ………………………………………………….. 91

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