Research progress of F-region metal ligand multiple bond by Professor Zhu Congqing of Nanjing University
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Last Update: 2018-12-28
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Source: Internet
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Author: User
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Recently, Professor Zhu Congqing's research group of School of chemistry and chemical engineering of Nanjing University has made progress in the research of metal ligand multiple bond in area F relevant results were published in nature communications (nature communications, 2018, 9, 4997) under the title of "double daily bond between valuable carbon (0) and uranium" Carbon is one of the most basic elements in chemistry Understanding the bonding nature between carbon and other elements is the central topic of chemical research On the other hand, the transition metal carbene chemistry with metal carbon double bond has developed rapidly, and has shown great application prospects in the field of synthetic chemistry According to the different properties of carbon atoms, the bonding modes of metal carbenes can be divided into three categories, as shown in Figure 1 At present, the single-wire Fischer type metal carbene and the three-wire Schrock type metal carbene have been studied in depth, while the study of carbon atom as both σ and P electron donor is less Figure 1 The bonding mode of carbon and metal (source: School of chemistry and chemical engineering, Nanjing University) Professor Zhu Congqing's research group designed and synthesized a novel three tooth chelated carbene precursor, which can be used as a σ and P electron donor to coordinate with the metal in area f at the same time after deprotonization, to obtain the species containing the metal carbon double bond in area F Through the regulation of ligand chelating sites, the group successfully obtained the F-region metal carbon double bond complexes of double teeth and single teeth chelation, indicating that the non chelated double bond species can still exist stably The results of X-ray single crystal diffraction show that the U-C bond length (2.4 μ) of these complexes is equivalent to the reported U-C double bond length Through the cooperation with Professor Gernot frenking of Marburg University and Professor Zhao Lili of Nanjing University of technology in theoretical calculation, the research team found that there is indeed a double coordination bond between uranium and carbon, that is, the two pairs of lone pair electrons of carbon atoms act with the metal uranium through the σ and π donors at the same time, forming a double bond instead of the traditional metal carbene bond This is the first time to put forward the concept of double coordination bond between carbon and F-region metal elements Under the guidance of Professor Zhu Congqing, this work was mainly completed by Dr Su Wei (the first author) The research work was supported by NSFC, NSFC of Jiangsu Province, the "distinguished professor" program of Jiangsu Province, and the project of young talent recommendation.
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