Superstructures from Oligothiophenes With Two Terminal Disc Caps

• Main Authors: Yu-Han Chen, 陳裕翰
• Other Authors: 徐秀福
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/68568164158339347275

碩士 === 淡江大學 === 化學學系碩士班 === 95 === In the first of this thesis, to improve the disc-like molecule hexakis(4-hexyloxy -phenylethynyl)benzene as aim. One of the side-arms of hexakis(4-hexyloxyphenyl- ethynyl)benzene was replaced with bromine, trimethylsily acetylene acetylene, ethyne and 2-pyridine. Then their groups affected the mesogenic behavior was investigated. In series 2, by adjusting among the disc-like molecule of intermolecule interaction to form one orientated nematic and high order columnar liquid crystal. In mesogenic properties, Bi- and ter-thiophene with two disc-like columnar molecules show wider mesogenic range than one disc-like columnar molecule. Moreover, for their optical properties, incorporating more thiophene unit results in red-shifted absorption and emission spectra and enhances Stoke’s shift.