The research team of Conghuan from Institute of physics and chemistry of Chinese Academy of Sciences has made new progress in the field of synthesis of carbon nanorings

As an important member of carbon nanomaterials family, carbon nanorings have unique geometric structure and photoelectric properties, and their academic and application values are widely recognized Because of its special structure and high ring tension, it is a challenge to construct carbon nano ring accurately for a long time Recently, the research team of Conghuan from the research center of Supramolecular Photochemistry, Institute of physics and chemistry, Chinese Academy of Sciences, together with the researchers of Shanghai University of traditional Chinese medicine, has made new progress in the accurate synthesis of carbon nano ring molecules by means of photochemical synthesis Using the reversibility of the classical photochemical anthracene [4 + 4] dimerization reaction, the researchers originally developed the anthracene photo dimerization depolymerization synthesis strategy, and further expanded the successful application of the strategy in the synthesis of large tension conjugated macrocycles based on the previous work (j.am.chem.soc 2016, 138, 11144) Under UV irradiation, 8-shaped bicycles can undergo reverse [4 + 4] reaction to realize large ring expansion The anthracene structural unit of large ring is used as diene, and the in-situ phenylalkyne molecule is subject to two-step [4 + 2] cycloaddition reaction, and then the first carbon nano bicycles derived from pentapterene are synthesized (angel Chem Int ed 2019, DOI: 10.1002/anie.201814482 ) In another work, by adjusting the length and bending angle of the side arm synthons, the researchers realized obtuse angle end ring closing of the anthracene dimer skeleton, and completed the synthesis of oligomeric p-phenylene macrocycles derived from anthracene dimer after reduction aromatization (chin J chem 2018, 36, 1135) The newly synthesized conjugated macrocyclic molecules have high fluorescence quantum yield, among which the macrocyclic molecules with pentadiene and p-phenylene conjugated structure show good circular polarization luminescence properties after resolution These results show the potential application value of these molecules in organic porous materials and photoelectric materials The above research results were published in China Chemistry (chin J chem 2018, 36, 1135, and selected as the cover article of the 12th issue in 2018) and German Applied Chemistry (angel Chem Int ed 2019, DOI: 10.1002/anie.201814482), respectively Guo Lifeng, a postgraduate of Institute of science and chemistry of Chinese Academy of Sciences, and Xu Wei, a postdoctoral researcher, were the first authors of the above papers Relevant research work has been strongly supported by class B pilot project of Chinese Academy of Sciences, National Natural Science Foundation of China, national key R & D plan and director fund of Institute of physics and chemistry.