Assembling molecular Sierpinski triangle fractals
Assembling molecular Sierpinski triangle fractals
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组装分子谢尔宾斯基三角分形
DOI：
10.1038/nchem.2211
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发表时间：
2015-05-01
期刊：
影响因子：
21.8
通讯作者：
Wu, Kai
中科院分区：
文献类型：
--
作者：
Shang, Jian;Wang, Yongfeng;Wu, Kai
正如Benoit B.Mandelbrot所定义的那样，分形图“在每个尺度上都完全相同，或者在不同的尺度上几乎相同”，是一种复杂而迷人的模式，在美学、数学、科学和工程中都很重要。由小分子组分的自组装形成的扩展分子分形图一直被追求，但据我们所知，还没有实现。为了应对这一挑战，我们设计并制造了两种芳香族溴化合物(4，4‘-二溴-1，1’：3‘，1“-三苯基和4，4”-二溴-1，1“：3’，1”：4“，1”-四苯基)作为积木。这些分子之间的协同卤素和氢键的形成是在低于80K的Ag(111)表面上成功组装一系列无缺陷的分子分形体，特别是Sierpinski三角形的驱动力。这一新策略可用于制备和探索各种表面的平面分子分形图。
Fractals, being "exactly the same at every scale or nearly the same at different scales" as defined by Benoit B. Mandelbrot, are complicated yet fascinating patterns that are important in aesthetics, mathematics, science and engineering. Extended molecular fractals formed by the self-assembly of small-molecule components have long been pursued but, to the best of our knowledge, not achieved. To tackle this challenge we designed and made two aromatic bromo compounds (4,4 ''-dibromo-1,1':3',1 ''-terphenyl and 4,4'''-dibromo-1,1':3',1 '':4 '',1'''-quaterphenyl) to serve as building blocks. The formation of synergistic halogen and hydrogen bonds between these molecules is the driving force to assemble successfully a whole series of defect-free molecular fractals, specifically Sierpinski triangles, on a Ag(111) surface below 80 K. Several critical points that govern the preparation of the molecular Sierpinski triangles were scrutinized experimentally and revealed explicitly. This new strategy may be applied to prepare and explore various planar molecular fractals at surfaces.