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Recently, the team of Professor Liu Peinian/Associate Professor Li Dengyuan of East China University of Science and Technology, the team of Researcher Qiu Xiaohui/Associate Researcher Liu Mengxi of the National Nano Center and the team of Professor Xingqiang Shi of Hebei University have cooperated to control the surface [2+2] cycloaddition reaction through the steric effect.
The directional construction of LPs chains was selectively realized, and the electronic properties were characterized in real space
.
Conjugated ladder polymers have attracted a lot of attention due to their attractive physical properties such as high carrier mobility, long exciton diffusion length and low energy gap
.
Ladder Phenylenes (LPs), composed of alternating six-membered and four-membered rings, are a unique class of conjugated ladder-shaped polymers
Surface synthesis technology provides a universal way for the precise manufacture of low-dimensional nanostructures (such as benzene macromolecules, one-dimensional polymers, and graphene nanoribbons) at the atomic level
.
Combining scanning probe microscopy technology can further study their topological structure and electronic properties
Recently, the team of Professor Liu Peinian/Associate Professor Li Dengyuan of East China University of Science and Technology, the team of Professor Xiaohui Qiu/Associate Researcher Liu Mengxi of the National Nano Center and the team of Professor Xingqiang Shi of Hebei University have cooperated to control the surface [2+2] cycloaddition reaction through steric effect.
The directional construction of the LPs chain was selectively realized (Figure 1), and its electronic properties were characterized in real space (Figure 2)
.
Figure 1.
Construction of single molecular chain of LPs based on highly selective surface [2+2] cycloaddition reaction
This research work developed a highly selective dehalogenation [2+2] cycloaddition reaction on the surface of Au(111) substrates, and prepared linear LPs chains with high quality
.
Among them, the steric hindrance effect of the methyl group in the precursor tetrabromopara-xylene (TBDMB) greatly improves the selectivity of the [2+2] cycloaddition reaction and directional control of the product structure
Figure 2.
dI/dV spectrum, dI/dV mapping and spin-resolved density of states of LPs single molecular chain
The research work was completed by the team of Professor Liu Peinian/Associate Professor Li Dengyuan from East China University of Science and Technology, the team of Professor Xiaohui Qiu/Associate Professor Liu Mengxi of the National Nano Center and the team of Professor Xingqiang Shi of Hebei University after four years of unremitting efforts
.
The research work was published in the Journal of the American Chemical Society in the form of communication: "Ladder Phenylenes Synthesized on Au(111) Surface via Selective [2+2] Cycloaddition", Deng-Yuan Li, † Xia Qiu, † Shi-Wen Li, † Yin-Ti Ren,† Ya-Cheng Zhu, Chen-Hui Shu, Xiao-Yu Hou, Mengxi Liu,* Xing-Qiang Shi,* Xiaohui Qiu,* Pei-Nian Liu,* J.
