Synthesis and Characterization of Highly Conjugated Liquid Crystal Compounds

number: 
3660
إنجليزية
department: 
Degree: 
Author: 
Marwa Suhail Hatem
Supervisor: 
Dr. Nasreen R. Jber (Assist. Prof.)
year: 
2016

This thesis consists of synthesis of five new highly conjugated dimeric and trimericazo compounds which were synthesized according to the schemes shown below.- The first compound A1 consist of π-conjugated compounds containing 1,3,4oxadiazole as the central units with terminal azo phenyl.
- The second compound A2 consist of π-conjugated compounds containing 1,2,4triazole (V) as the central units with terminal azo phenyl group and lateral pbromobenzylideneamino group,as shown below (scheme2).
- Compound V 4,4`-(p-bromobenzylideneamino)-5,5`-mercapto[bis-1,2,4-triazole3-yl]phenyl was prepared as shown in scheme (3).
- The third compound A3 consist of π-conjugated compounds containingpyromelittic diimide as the central units with terminal azo phenyl group, asshown below (scheme 4).    
- The fourth compound A4 consist of π-conjugated compounds derived from 3,5 dihydroxy benzoic acid, as shown below (scheme 5).    
- The fifth compound A5 consist of trimeric π-conjugated compounds derived from 1,3,5-trihydroxy benzene, as shown below (scheme 6).    
- All the synthesized compounds were characterized using FTIR and CHNS-O analysis and some of them by  1HNMR
- The liquid crystalline properties of synthesized compounds which were verified using differential scanning calorimeter (DSC) and hot- stage polarizing optical microscope (POM) were discussed.
- The compounds show photoluminescence properties in the organic solution at room temperature, with the fluorescence band centered around 400 nm.