Direct aryl-aryl coupling of pentacene on Au(110).
Direct aryl-aryl coupling of pentacene on Au(110).
复制标题
并五苯在 Au(110) 上的直接芳基-芳基偶联。
DOI:
10.1039/d1cp03460j
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发表时间:
2021-09
期刊:
影响因子:
--
通讯作者:
Dingyong Zhong
中科院分区:
文献类型:
--
作者:
Zeying Cai;Shenwei Chen;Zengfu Ou;Donghui Guo;Zhiqiang Wang;Dingyong Zhong
Selective C-H bond activation of polycyclic aromatic hydrocarbons is challenging due to the relatively high bond dissociation energy and the existence of multiple equivalent C-H sites. Herein, we report a scanning tunneling microscopy study on the covalent coupling of pentacene molecules on Au(110) surfaces. The missing-row reconstruction of Au(110) surfaces strengthens the molecule-substrate interactions. At elevated temperatures (470-520 K), pentacenes undergo direct aryl-aryl coupling via C-H bond activation. Due to the anisotropic feature of the reconstructed Au(110) surface, pentacenes are preferentially oriented parallel or perpendicular, making the linear and T-shaped dimers the predominant products. Based on density functional theory calculations, the aryl C-H bond activation barrier is reduced to 1.42 eV on Au(110)-(1 × 3) reconstructed surfaces, at which the extra row of gold atoms located in the (1 × 3) reconstructed grooves plays a key role.
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