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Synthesis and Study on Multi-thiophene Photochromic Compounds

Author: LingXiang
Tutor: LuoQianFu
School: East China University of Science and Technology
Course: Organic Chemistry
Keywords: Terthiophenes Photochromic Dendrimer
CLC: O626.12
Type: Master's thesis
Year: 2011
Downloads: 98
Quote: 0
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Abstract


The heterocyclic aromatic group substituted by an aryl group , ethylene-based photochromic compounds study reported mainly concentrated on the molecule contains only one photochromic unit , while on the study of molecules containing two or more photochromic unit reported less . In addition , a thiophene ring is an ideal structure for a transition metal catalyzed coupling reaction , there are many modifications thiophene , and because of the multi- thiophene compound having the larger of the pi conjugated system , having good electron or energy transmission capacity . Accordingly, in order to further study of the molecule containing two or more Photochromic compound performance , we synthesized by the Suzuki coupling reaction design several thiophene the the center alkylene bridge , thiophene modifier group containing two photochromic unit multi- thiophene compounds and study their photochromic properties . The study found that terthiophenes fast response, but two color unit can simultaneously ring- need further study . Our group has been confirmed after additional pretreatment does not require trans dithiophene ethylenic compound , and they also have good photochromic properties , but the ring-closing speed is relatively slow . On the basis of this study , we tried through the introduction of relatively strong some suction electronic functional group in the side chain of the thiophene , the design synthesis of some dithiophene thiophene ethylene class compound , to compare with the already - synthetic compound , found its related ring speed is greatly improve the due the dendrimer unique structure and nature and a wide range of application areas , we use some of the classic reaction Kumada reaction , Suzuki reaction , designed two multi - switch full- thiophene dendrimer , discover their photochromic properties .

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Heterocyclic compounds > Five heterocycles containing a single different atoms > Thia -mao ( thiophene ) family
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