Liquid crystalline behavior and fluorescent property of calix[4]arene containing azobenzene photochr

来源 :中国高等学校学术文摘·化学 | 被引量 : 0次 | 上传用户:yjq123wlz
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The reaction of 4’-hydroxy-4-methyl azobenzene (1) and 1,6-dibromohexane afforded 6-bromo-1-((4- ((4-met hylphenyl)azo)phenyl)oxy)hexane (2),which further reacted with p-tert-butylcalix[4]arene to give the calix[4]arene derivative (3) whose lower rim had been modified by the azobenzene photochromic group.The structure of 3 was characterized by 1H-nuclear magnetic resonance (NMR) and electrospray ionization-mass spectrometry (ESI-MS).The fluorescence intensity of compound 3 was two to four times higher than that of compounds 1 and 2 as the azobenzene group concentration in the range of 1.6 x 10-5 to 8.0 ×10-4 mol/L,indicating that the fluorescence quantum yield of the azobenzene group had been improved through being attached to the calix[4]arene skeleton.The liquid crystalline behavior of compound 3 was studied by polarized microscopy (POM) and differential scan calorimeter (DSC).Compound 3 exhibited the enchased texture ofa smectic liquid crystal from 209.4℃ to 219.5℃ on heating,while 2 exhibited a liquid crystalline phase from 87.4 to 83.2℃ on cooling.It was found that the calix[4]arene skeleton was a good platform for conformation immobilization ofazobenzene photochromic group and the formation of liquid crystalline.
其他文献
Polystyrene microspheres with an average diameter of 55 μm were prepared by suspension polymerization via oxidation of the monomer by ammonium persulfate. Poly
Behaviour-based approach plays a key role for mobile robots to operate safely in unknown or dynamically changing environments. We have developed a hybrid contro
白墙黑瓦、溪水潺潺……你千万别以为自己到了江南水乡,其实这只是在中国美术馆举行的吴冠中捐赠作品展的现场。本次展览由中国美术馆、上海美术馆、新加坡美术馆联合主办,展
去年《新闻战线》第七期上,登了一篇短文,讲的是从事新闻工作最好从校对做起,并认为可以把这做为一条制度坚持下来。文章引用了作家秦牧的《总编辑起于校对》这样一句话作题
4-(2-Hydroxy-phenyl)-but-3-en-2-one (1) was prepared via condensation of salicylaldehyde with acetone,and then reaction of the ketone 1 with thiosemicarbazide w
Ketol-acid reductoisomerase(KARI) is a promising target for the design of herbicides yet there are only few reports on the molecular design of KARI inhibitors.
A new route to porous polyimide(PI)films with pore sizes in the nanometer regime was developed.A polyamic acid(PAA)/polyurethane(PU)blend with PU as the dispers
随着城镇化进程的发展,农村人口逐步向城镇转移,导致农村劳动力数量越来越少,进而影响粮食生产和国家粮食安全,因此农作物轻型化栽培技术迅速发展。再生稻是头季稻收割后稻桩上的腋芽萌发成苗并且抽穗结实然后收获的一季水稻的种植方式。它具有一次种植两次收获的优点,但与直播和抛秧等轻型化栽培技术相比,头季稻的人工插秧和收割严重影响了再生稻的发展。本研究的研究目标是1)明确赣东北再生稻的再生能力的调控因素;2)分
The morphology and structure of Pt-CNTs/GC electrodes were characterized via Transmission Electron Microscopy (TEM) and selected area electron diffraction.The e