Luminescence and structure of Eu(DBM)(3)Phen-doped vesicles composed of amphiphilic PNIPAM-b-PAzoM

作者：Yan Qing; Su Wei; Cheng Yilong; Luo Yanhua; Zhang Qijin^*

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2008, 200(2-3): 101-105.

DOI：10.1016/j.jphotochem.2008.07.001

• Luminescence
• Polymer vesicle
• Azobenzene
• Diblock copolymer
• Lanthanide complex

Eu(DBM)(3)Phen-(DBM=dibenzoylmethide: Phen = 1,10-phenanthroline) doped vesicles were obtained through the self-assembly of poly (N-isopropylacrylamide)-b-poly{6-[4-(4-methylphenyl-azo) phenoxyl hexylacrylate} (PNIPAM-b-PAzoM) in the presence of Eu(DBM)(3)Phen in the H2O/THF solution (50/50vol.%). When the water content of the vesicle solution increased from 50vol.% to 98vol.% the characteristic luminescence of Eu(DBM)(3)Phen at 612 nm appeared. Moreover, with the increased water content, luminescence intensity gradually increased by about 200 times from 50vol.% to 98vol.% of the water content. A further detailed study on this phenomenon has shown that azobenzene units and Eu(DBM)(3)Phen were located in the shell of the vesicle, such that when more water was added into the solution, azobenzene units aggregated to a larger extent as demonstrated by their subsequent absorption-shift. From our results,we find that it is the more hydrophobic environment within the shell that has made the fluorescence of Eu(DBM)(3)Phen stronger. Such an environment hinders the interactions between water molecules and the complex. In this study, a model is presented for the azobenzene-containing vesicle in order to explain this phenomenon.

• 出版日期2008-12-15
• 单位中国科学技术大学