首页> 中文期刊> 《高校化学工程学报》 >端基含希夫碱配合物的聚苯乙烯的合成及其荧光性能的研究

端基含希夫碱配合物的聚苯乙烯的合成及其荧光性能的研究

         

摘要

An atom transfer radical polymerization process (ATRP) of styrene (St) was proceeded using 5-chloromethyl-2-hydroxy-benzaldehyde as the initiator, CuCl as the catalyst and 2,2'-Bipyridine(Bpy) as the ligand. Fuctionalized polystyrene ligands containing schiff base end groups were obtained by condensation of p-methoxyanilin, aniline, p-nitroaniline and p-aminobenzoic acid with polystyrene containing a salicylaldehyde end group (PSt-S), respectively. Under microwave assisted conditions, polystyrene ligands containing schiff base end groups were applied to prepare Zn(II) complexes. The structure of polystyrene ligands and their complexes were characterized by 1H-NMR,IR and UV-Vis spectra. NMR results show that the proton of-CHO completely disappears and that of-CH=N appears in the spectra, so the condensation reaction of salicyladehyde with four kinds of aniline derivatives are completed. When excited at 330 nm, the four polystyrene Zn(II) complexes prepared emits intense green fluorescence. Moreover, these four polystyrene Zn(II) complexes are soluble in solvents and easy to form film. Moreover, the effects of different substitutional groups, molecular weights and microwave reaction conditions on Zn contents and fluorescent intensity were also discussed. The results show that electronic donor groups such as-OCH3 cause red shift of the fluorescence with an increase of intensity. By controlling molecular weight of polystyrene, the fluorescence intensity can be controlled. Compared to room temperature or heating conditions, microwave radiation can accelerate the reaction rate.%通过原子转移自由基聚合(ATRP)方法合成了含水杨醛端基的聚苯乙烯(PSt-S),并分别与对氨基苯甲酸、对甲氧基苯胺、苯胺以及对硝基苯胺反应,使其水杨醛端基转变成希夫碱可配位基团。这类含希夫碱端基的聚苯乙烯在微波辐射条件下分别与Zn(II)配位,得到端基为希夫碱-Zn(II)配位基团的聚苯乙烯配合物,具有良好的成膜性,并能发射较强的绿色荧光。考察了取代基、聚合物分子量、微波辐射强度和时间对聚苯乙烯配合物荧光强度的影响,结果表明供电子基团的引入使得荧光发射峰红移,且荧光强度增大;控制聚合物的分子量可以调控荧光强度;相对于常规条件,微波辐射有助于配位反应。

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