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Intermolecular C–C coupling after cleavage of C–X (mostly, X = Br or I) bonds has been extensively studied for facilitating the synthesis of polymeric nanostructures

Time:2019-04-25Source:HGIView:178

Intermolecular CC coupling after cleavage of CX (mostly, X = Br or I) bonds has been extensively studied for facilitating the synthesis of polymeric nanostructures. However, the accidental appearance of CH coupling at the terminal carbon atoms would limit the successive extension of covalent polymers. To our knowledge, the selective CH coupling after dehalogenation has not so far been reported, which may illuminate another interesting field of chemical synthesis on surfaces besides in situ fabrication of polymers, i.e., synthesis of novel organic molecules. By combining STM imaging, XPS analysis, and DFT calculations, we have achieved predominant CC coupling on Au(111) and more interestingly selective CH coupling on Ag(111), which in turn leads to selective synthesis of polymeric chains or new organic molecules.