The carbon-carbon coupling of 4,4'-dibromo-p-terphenyl (DBTP) on Pd(111) surface has been investigated at a single molecular level by scanning tunneling microscopy. DBTP molecules undergo debromination partially and are aligned along the [1], [2], [3], [4], [5], [6], [7], [8], [9], [10] direction of the surface after deposition at RT. Annealing at 338 K promotes the formation of V-shaped and zigzag-shaped oligomers. The high resolution STM images revel that such carbon-carbon coupling benefits form Pd-catalyzed meta-CH activation.

中文翻译：

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通过扫描隧道显微镜直接观察Pd（111）上的亚选择性CH活化

已通过扫描隧道显微镜在单个分子水平上研究了Pd（111）表面上4,4'-二溴-对-三联苯（DBTP）的碳-碳偶联。DBTP分子会部分脱溴，并沿[1]，[2]，[3]，[4]，[5]，[6]，[7]，[8]，[9]，[10]方向排列在室温下沉积后的表面粗糙度。338 K的退火促进了V形和之字形低聚物的形成。高分辨率STM图像证明，这种碳-碳偶联作用可形成Pd催化的间位CH活化。