The effect of macromolecular architecture in nanomaterials:: A comparison of site isolation in porphyrin core dendrimers and their isomeric linear analogues

被引:161
作者
Harth, EM
Hecht, S
Helms, B
Malmstrom, EE
Fréchet, JMJ
Hawker, CJ
机构
[1] IBM Corp, Almaden Res Ctr, San Jose, CA 95120 USA
[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
关键词
D O I
10.1021/ja025536u
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The influence of macromolecular architecture on the physical properties of polymeric materials has been studied by comparing poly(benzyl ether) dendrons with their exact linear analogues. The results clearly confirm the anticipation that dendrimers are unique when compared to other architectures. Physical properties, from hydrodynamic volume to crystallinity, were shown to be different, and in a comparative study of core encapsulation in macromolecules of different architecture, energy transduction from the polymer backbone to a porphyrin core was shown to be different for dendrimers as compared to that of isomeric four- or eight-arm star polymers. Fluorescence excitation revealed strong, morphology dependent intramolecular energy transfer in the three macromolecular isomers investigated, Even at high generations, the dendrimers exhibited the most efficient energy transfer, thereby indicating that the dendritic architecture affords superior site isolation to the central porphyrin it surrounds.
引用
收藏
页码:3926 / 3938
页数:13
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