Polymeric Ladderphanes
Polymeric Ladderphanes
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DOI：
10.1021/ja9035362
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发表时间：
2009-09-09
影响因子：
15
通讯作者：
Luh, Tien-Yau
中科院分区：
文献类型：
--
作者：
Chou, Chih-Ming;Lee, Shern-Long;Luh, Tien-Yau
合成了一类新的聚合物，它具有双链聚二冰片烯骨架和多层平面低芳基连接体，被定义为聚合物阶梯。这些阶梯的结构是用光谱学方法确定的。光物理研究和时间分辨荧光光谱研究表明，在发色团连接体之间存在很强的相互作用。因此，具有卟啉连接体（12e）的聚合物的吸收光谱中的Sorel波段分裂，具有低芳基连接体（12b-d）的显著荧光猝灭，以及具有ter苯乙烯-二乙烯连接体（12a）的准分子发射是这些聚合物的特征光物理性质。扫描隧道显微镜显示，聚合物12b和d呈现阶梯状形态，并在高取向热解石墨表面形成超分子组装，形成二维有序阵列。
A new class of polymers, which have a double-stranded polybinorbornene skeleton with multilayer planar oligoaryl linkers, defined as polymeric ladderphanes, are synthesized. The structures of these ladderphanes are determined by spectroscopic means. Photophysical studies and time-resolved fluorescence spectroscopic investigations reveal that there is a strong interaction between the chromophore linkers. Thus, Sorel band splitting in the absorption spectrum of the polymer with porphyrin linker (12e), significant fluorescence quenching with oligoaryl linkers (12b-d), and excimer emission with a terphenylene-diethynylene linker (12a) are characteristic photophysical properties of these polymers. Scanning tunneling microscopy shows that polymers 12b and d exhibit a ladder-like morphology and form a supramolecular assembly leading to a two-dimensional ordered array on a highly oriented pyrolytic graphite surface.