The Liquid Crystal Materials of Luminescent Tri-Aromatic Conjugated Rings Molecules and Their H-Bond Derivatives
| Autor: | Yizhen Su, 蘇羿貞 |
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| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 91 A series of novel photoluminescent materials with three conjugated aromatic segment including an end-capping pyridine were synthesized successfully via Heck, Wittig and Sonogashira reaction. H-bonded complexes were obtained from the reaction of these compounds with different proton donors containing carboxylic acids groups. The thermal properties of these materials were measured by TGA、DSC and POM. The onset decomposition temperatures (Td) of all compounds range from 310℃to382 ℃. The optical properties of these materials were measured by UV/VIS and PL (photoluminescent) spectroscopic studies. All of these compounds exhibit the maxaimum absorption in the range of 334~382 nm in diluted dichloromathane. They emit blue to blue-green fluorescence around 424~461nm in dichloromathane. The energy gap of these compounds can be modifided by variation of the end groups and conjugation length as evidenced from CV and UV studies. The experimental results suggest that the H-bonded interaction of the complexes results in a red-shift of the UV and PL spectra.THDA has the most red-shifted emission due to its lowest pH value. Moreover, the emission color of the compounds can be easily tuned by H-bond. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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