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Single-atom protecting group for the on-surface synthesis of graphdiyne nanowires
Aidi Zhao
Author NameAffiliationE-mail
Aidi Zhao Hefei National Laboratory for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information & Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China. adzhao@ustc.edu.cn 
Abstract:
On-surface synthesis of semiconducting graphdiyne nanowires usually suffer severe side reactions owing to the high reactivity of the butadiynylene units at noble metal surfaces, limiting the production of isolated nanowires. In this letter, we report the high-yield synthesize of branchless graphdiyne nanowires [?C≡C?Ph2?C≡C?]n via on-surface Ullmann coupling of 1,4-bis(4-bromophenyl)-1,3-butadiyne molecules with chemical vapor deposition method. Non-contact atomic force microscopy with single-bond resolution reveals that single gold adatoms act as effective protecting groups for butadiynylene units by forming Au-π ligand bonds, preventing unwanted branched coupling reactions and enabling the synthesis of ultralong isolated graphdiyne nanowires. This study will stimulate further investigation on the role of various surface adatoms in protecting on-surface reactions.
Key words:  On-surface synthesis, graphdiyne, Ullmann coupling, protecting group, atomic force microscopy.
FundProject:
Single-atom protecting group for the on-surface synthesis of graphdiyne nanowires
赵爱迪
摘要:
On-surface synthesis of semiconducting graphdiyne nanowires usually suffer severe side reactions owing to the high reactivity of the butadiynylene units at noble metal surfaces, limiting the production of isolated nanowires. In this letter, we report the high-yield synthesize of branchless graphdiyne nanowires [?C≡C?Ph2?C≡C?]n via on-surface Ullmann coupling of 1,4-bis(4-bromophenyl)-1,3-butadiyne molecules with chemical vapor deposition method. Non-contact atomic force microscopy with single-bond resolution reveals that single gold adatoms act as effective protecting groups for butadiynylene units by forming Au-π ligand bonds, preventing unwanted branched coupling reactions and enabling the synthesis of ultralong isolated graphdiyne nanowires. This study will stimulate further investigation on the role of various surface adatoms in protecting on-surface reactions.
关键词:  On-surface synthesis, graphdiyne, Ullmann coupling, protecting group, atomic force microscopy.
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