Cross-coupling of aryl-bromide and porphyrin-bromide on an Au(111) surface
Guowen Kuang1, Qiushi Zhang1, Deng Yuan Li2
1Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay (Hong Kong).
Abstract:
Cross-coupling is of great importance in organic synthesis. Here it is demonstrated that cross-coupling of aryl-bromide and porphyrin-bromide takes place on a Au(111) surface in vacuo. The products are oligomers consisting of porphyrin moieties linked by p-phenylene at porphyrin's meso-positions. The ratio of the cross-coupled versus homocoupled bonds can be regulated by the reactant concentrations. Kinetic Monte Carlo simulations were applied to determine the activation barrier. It is expected that this reaction can be employed in other aryl-bromide precursors for designing alternating co-polymers incorporating porphyrin and other functional moieties.
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