A series of novel monodisperse star-shaped oligo(fluoreneethynylene)s, which contain hexahexyltruxene as the central core linked with oligo(fluoreneethynylene) as the arms, are presented.
Their molecular structures were confirmed by NMR, MALDI-TOF MS spectrometry and elementary analysis. The fluorescence spectra showed that introduction of ethynylene linker showed that the optical properties of the starburst oligofluorenes were modified. Both the absorption and the fluorescence peaks were found to be red-shifted.
介绍了新的单分散星爆低聚芴衍生物,其中包含 5,5',10,10',15,15'-六己基芴作为中心核心,与低聚 (9,9'-二己基芴) 作为臂通过亚乙炔桥相连。所有这些化合物都是通过 Sonogashira 反应制备的。它们的分子结构经核磁共振、MALDI-TOF MS 光谱和元素分析证实。荧光光谱表明,乙炔接头的引入改变了星爆型低聚芴的光学性质。发现吸收峰和荧光峰都发生红移。
Star-shaped oligo(fluorene ethynylene)-functionalized truxene derivatives: synthesis, characterization, and their size effects
A series of monodisperse, well-defined, star-shaped truxene derivatives bearing oligo(fluorene ethynylene) (OFE) branches were constructed through a convergent synthetic strategy. The radius of the largest molecule TOFE4 was up to about 4.5 nm. Linear OFE branches with different length were first constructed in high yields alternately using the Sonogashira cross-coupling and propargyl alcohol deprotection