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    Home > Progress in carbon dragon chemistry: one atom shared by four aromatic rings

    Progress in carbon dragon chemistry: one atom shared by four aromatic rings

    • Last Update: 2020-02-10
    • Source: Internet
    • Author: User
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    Recently, new progress has been made in original carbon dragon chemistry of Xiamen University, and relevant achievements have been published in science advanced (DOI: 10.1126 / sciadv.aay2535) under the title of "access to tetracyclic chemistry with bridgehead metals by metalla click reaction" The construction of a new aromatic framework, especially a new condensed aromatic framework, is an important basis for the development of π conjugated new systems with unique physical and chemical properties However, with the development of chemistry, it is increasingly difficult to find new molecular skeletons In classical aromatic chemistry, since carbon is 4-valent, a single carbon atom can only condense up to three aromatic rings (such as graphene) The transition metal can have many coordination sites, and it has many kinds, rich valence states and ligands In addition, the d-orbital which is not full of transition metal can replace the p-orbital which is the main group element to participate in the bonding, which brings new opportunities for the development of aromatic chemistry Recently, Xia Haiping, Professor of Xiamen University, realized a new extension of click reaction, which is the first case of post transition metal Carbyne and azide [3 + 2] cycloaddition reaction Based on this reaction, the first extreme large p-conjugated structure with a single atom bridged four aromatic rings was successfully constructed Thus, the history of "one bridgehead atom can only be shared by three aromatic rings at most" is ended Theoretical calculation shows that the four ring system is a 14 center-16 electron D π - P π conjugated aromatic system The tetracyclic compound has the characteristics of wide absorption from ultraviolet to near infrared, and has good photothermal conversion performance It has good application prospects in solar energy utilization, biomedicine and other aspects Under the guidance of Professor Xia Haiping and Professor Zhang Hong, the experimental work was mainly completed by Dr Lu Zhengyu and Dr Cai Yuanting; the theoretical calculation was completed by Dr Zhu Qin, Ph.D student of Professor Zhu Jun's research group; Dr Chen Zhixin and Dr Zhuo Kaiyue participated in part of the experimental work The research work is supported by the National Natural Science Foundation of China (project approval No.: 21490573, 21572185, u1705254).
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