苄醇作為液晶末端基之研究
碩士 === 國立高雄師範大學 === 化學系 === 90 === The compound,benzyl 4-(4’-octoxybiphenyl-4-carbonyloxy) benzoate (8b), was first synthesized by Gray and coworkers. The results show that this compound is not a liquid crystal. Lee of our laboratory has synthesized the same compound and proved that it d...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2002
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| Online Access: | http://ndltd.ncl.edu.tw/handle/64705455765869581652 |
| Summary: | 碩士 === 國立高雄師範大學 === 化學系 === 90 === The compound,benzyl 4-(4’-octoxybiphenyl-4-carbonyloxy) benzoate (8b), was first synthesized by Gray and coworkers. The results show that this compound is not a liquid crystal. Lee of our laboratory has synthesized the same compound and proved that it do have mesogenic properties. A series of homologues with different number of alkoxy chain were synthesized in order to study the relationship between the structure and the liquid crystal phase behavior.
This series of compounds were prepared by the esterification of 4-(4’-alkoxyphenyl)benzoic acid and 4-hydroxybenzoic acid benzyl ester in the presence of DCC and DMAP.
The results indicate that all of the compounds (10b to 2b) have the same liquid crystal phase sequence K－SA－I during the heating process. But they show different phase behavior during the cooling process: I－SA－SC－S?－K for 10b、9b、8b、7b and 6b；I－SA－SC－K for 4b；I－SA－K for 5b、3b and 2b. The phase transition temperature of SA phase has an even-odd effect during the heating process. However the compound (10c) does not possess any liquid crystal phase.
n=10→10b、n=9→9b、n=8→8b、n=7→7b、n=6→6b、n=5→5b、
n=4→4b、n=3→3b；n=2→2b
→10c
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