Key Laboratory of Optoelectronic Science and Technology, Anhui Province, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 Mar;75(3):992-6. doi: 10.1016/j.saa.2009.12.024. Epub 2009 Dec 16.
Poly(N-isopropylacrylamide)-b-poly[6-[4-(4-methylphenyl-azo)phenoxy]hexylmethacrylate] (PNIPAM(32)-b-PAzoMM(8)) and poly(N-isopropylacrylamide)-b-poly[6-[methyl(4-nitrophenyldiazenyl)phenyl]aminohexylmethacrylate] (PNIPAM(32)-b-PAzoNO(10)) were prepared by reversible addition-fragmentation chain transfer (RAFT) radical polymerization. The optical properties of Eu(DBM)(3)Phen (Eu, Europium; DBM, dibenzoylmethide; Phen, 1,10-phenanthroline)-doped azobenzene-containing copolymer vesicle solutions were studied by UV-vis and fluorescence spectroscopy. When the electronic transition bands of azobenzene and Eu(DBM)(3)Phen overlapped at about 350 nm in PNIPAM(32)-b-PAzoMM(8), the fluorescent emission intensity at 612 nm of Eu(DBM)(3)Phen could be modulated by irradiation with UV and visible light. However, when the absorption of the azobenzene-moiety red-shifted to 477 nm in PNIPAM(32)-b-PAzoNO(10), the luminescence intensity of Eu(DBM)(3)Phen was not affected any longer. The difference between these two systems was possibly caused by the energy allocation in the luminescence process, which was discussed in detail.
聚（N-异丙基丙烯酰胺）-b-聚[6-[4-（4-甲基苯基偶氮）苯氧基]己基甲基丙烯酸酯]（PNIPAM(32)-b-PAzoMM(8)）和聚（N-异丙基丙烯酰胺）-b-聚[6-[甲基（4-硝基苯亚氨基）苯基]氨基己基甲基丙烯酸酯]（PNIPAM(32)-b-PAzoNO(10)）是通过可逆加成-断裂链转移（RAFT）自由基聚合制备的。通过紫外可见光谱和荧光光谱研究了 Eu(DBM)(3)Phen（Eu，铕；DBM，二苯甲酰甲烷；Phen，1,10-邻菲啰啉）掺杂含偶氮苯的两亲性嵌段共聚物囊泡溶液的光学性质。当 PNIPAM(32)-b-PAzoMM(8)中偶氮苯和 Eu(DBM)(3)Phen 的电子跃迁带在约 350nm 重叠时，Eu(DBM)(3)Phen 在 612nm 的荧光发射强度可以通过紫外光和可见光的辐照来调制。然而，当 PNIPAM(32)-b-PAzoNO(10)中偶氮苯部分的吸收红移到 477nm 时，Eu(DBM)(3)Phen 的发光强度不再受到影响。这两个体系之间的差异可能是由于发光过程中的能量分配所致，对此进行了详细讨论。
