%0 Journal Article
%T Novel azobenzene-phthalocyanine dyads¡ªdesign of photo-modulated J-aggregation
%A LiHong Niu
%A Cheng Zhong
%A ZiHui Chen
%A Zhi Zhang
%A ZhongYu Li
%A FuShi Zhang
%A YingWu Tang
%J Chinese Science Bulletin
%@ 1861-9541
%D 2009
%I 
%R 10.1007/s11434-009-0099-1
%X Based on the J-aggregation mechanism of ¦Á-aryl/alkoxy-substituted zinc phthalocyanines(Pcs) in non-coordinating solvents, two novel azobenzene-phthalocyanine dyads (3-azo-ZnPc and 4-azo-ZnPc) were synthesized with the aim of developing Pc compounds whose ability to form J-aggregation could be photo-modulated. It was found that 3-azo-ZnPc in chloroform could be effectively photo-controlled in a wide range. This phenomenon could be explained by the changes in the geometry and dipole moment of azobenzene during the photo-isomerization process. 4-azo-ZnPc did not have this ability at all, with or without UV light illumination. The positions of the oxygen atoms to which the aryl/alkoxy substitution was attached relatively were found important in determining the aggregation ability.
%K J-aggregation
%K azobenzene
%K phthalocyanine
%K photo-modulated
%K self-assembly
%U http://link.springer.com/article/10.1007/s11434-009-0099-1