A novel benzoxazine monomer containing aldehyde group, 3-phenyl-6-formyl-3, 4-dihydro-2H-1, 3-benzoxazine （Ald-B）, was synthesized via the Mannich condensation of formaldehyde, p-hydroxybenzaldehyde and aniline. Its...A novel benzoxazine monomer containing aldehyde group, 3-phenyl-6-formyl-3, 4-dihydro-2H-1, 3-benzoxazine （Ald-B）, was synthesized via the Mannich condensation of formaldehyde, p-hydroxybenzaldehyde and aniline. Its structure was characterized by Fourier transform infrared spectroscopy （FTIR）, proton nuclear magnetic resonance （^1HNMR）. The side reaction in the synthesis is discussed.展开更多
Three kinds of fluorinated Schiff＇s base esters, 4-allyloxy-2-X-6-X-benzoic acid 4-[（2, 3, 4-trifluorophenylimino）methyl]phenyl ester, where X=H or F, were synthesized and characterized. Their chemical structures w...Three kinds of fluorinated Schiff＇s base esters, 4-allyloxy-2-X-6-X-benzoic acid 4-[（2, 3, 4-trifluorophenylimino）methyl]phenyl ester, where X=H or F, were synthesized and characterized. Their chemical structures were identified by Fourier transform infrared spectroscopy （FTIR） and ^1H nuclear magnetic resonance （^1H NMR）. Their mesomorphic properties were studied by polarized optical microscopy （POM） and differential scanning calorimetry （DSC）. It was found that all the three compounds exhibited enantiotropic nematic phases only. And their cleating point temperature and thermal range of mesophase decreased with the number of fluorine atoms on the rigid core of the compounds; while their melting point temperature showed no distinct regularity.展开更多
A series of single-chain amphiphiles containing Schiff base moiety(CnSchC4N+ , n=4, 7, 10, 12, 16) were synthesized. The self-assembly properties were investigated by 1H NMR spectra, DSC and EM for aqueous solutions o...A series of single-chain amphiphiles containing Schiff base moiety(CnSchC4N+ , n=4, 7, 10, 12, 16) were synthesized. The self-assembly properties were investigated by 1H NMR spectra, DSC and EM for aqueous solutions of these samples. The aggregates, vesi-cles, were formed when n=7. The influence of additional group-O-is discussed.展开更多
以氰基乙酸乙酯、2-丁酮、二乙胺和硫粉为原料,乙醇为溶剂,在一定条件下合成了4,5-二甲基-3-乙氧羰基噻吩胺,然后与六种不同的芳醛反应,合成了六种相应的Schiff碱。通过MS、~1 H NMR、IR和UV等对合成的化合物进行表征,结果表明目标产物...以氰基乙酸乙酯、2-丁酮、二乙胺和硫粉为原料,乙醇为溶剂,在一定条件下合成了4,5-二甲基-3-乙氧羰基噻吩胺,然后与六种不同的芳醛反应,合成了六种相应的Schiff碱。通过MS、~1 H NMR、IR和UV等对合成的化合物进行表征,结果表明目标产物结构与理论相符。然后对这六种目标产物进行荧光光谱性能测试,结果表明这些化合物具有较强荧光;并且通过研究溶液的极性对目标化合物荧光强度的影响,发现目标化合物的荧光强度随着溶液极性增大而增强。展开更多
基金We are grateful to the National Natural Science Foundation of China for financial support （No.90405001）.
文摘A novel benzoxazine monomer containing aldehyde group, 3-phenyl-6-formyl-3, 4-dihydro-2H-1, 3-benzoxazine （Ald-B）, was synthesized via the Mannich condensation of formaldehyde, p-hydroxybenzaldehyde and aniline. Its structure was characterized by Fourier transform infrared spectroscopy （FTIR）, proton nuclear magnetic resonance （^1HNMR）. The side reaction in the synthesis is discussed.
基金the National High-Tech Research and Development Program of China (863 Program, No. 2003AA327050) the Major Project of Ministry of Education of the People’s Republic of China (No.104187).
文摘Three kinds of fluorinated Schiff＇s base esters, 4-allyloxy-2-X-6-X-benzoic acid 4-[（2, 3, 4-trifluorophenylimino）methyl]phenyl ester, where X=H or F, were synthesized and characterized. Their chemical structures were identified by Fourier transform infrared spectroscopy （FTIR） and ^1H nuclear magnetic resonance （^1H NMR）. Their mesomorphic properties were studied by polarized optical microscopy （POM） and differential scanning calorimetry （DSC）. It was found that all the three compounds exhibited enantiotropic nematic phases only. And their cleating point temperature and thermal range of mesophase decreased with the number of fluorine atoms on the rigid core of the compounds; while their melting point temperature showed no distinct regularity.
文摘A series of single-chain amphiphiles containing Schiff base moiety(CnSchC4N+ , n=4, 7, 10, 12, 16) were synthesized. The self-assembly properties were investigated by 1H NMR spectra, DSC and EM for aqueous solutions of these samples. The aggregates, vesi-cles, were formed when n=7. The influence of additional group-O-is discussed.
文摘以氰基乙酸乙酯、2-丁酮、二乙胺和硫粉为原料,乙醇为溶剂,在一定条件下合成了4,5-二甲基-3-乙氧羰基噻吩胺,然后与六种不同的芳醛反应,合成了六种相应的Schiff碱。通过MS、~1 H NMR、IR和UV等对合成的化合物进行表征,结果表明目标产物结构与理论相符。然后对这六种目标产物进行荧光光谱性能测试,结果表明这些化合物具有较强荧光;并且通过研究溶液的极性对目标化合物荧光强度的影响,发现目标化合物的荧光强度随着溶液极性增大而增强。
