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説明:

Coordination polymers on surfaces have been investigated at the atomic level via scanning tunneling microscopy (STM), revealing a variety of structures and electronic states. However, analysis of their dynamic behaviours at low temperatures has been hampered due to the strong adsorption of organic ligands on metal surfaces. In this study, we designed 2,7-dicyano-9,9-dimethyl-9H-fluorene (DCF) as a ligand for coordination polymer in order to reveal its mobility at low temperatures. The dimethyl group attached to the ligand reduces the interaction with the metal surface and serves as an indicator of the ligand orientation. This enables individual tracking of DCF in DCF-Cu polymer on Cu(111) after their coordination with copper adatoms. Upon heating from 4 K to 78 K, branched structures were less mobile, while linear structures and short polymers with free ends exhibited higher mobility. Partial cleavage, recombination, and insertion of the polymer chains were observed in some sections of the polymer chains. Density functional theory (DFT) calculations suggest that the flexibility of the coordination angle (180° ± 20°) facilitates such transformations. This study provided a direct observation of the motion differences attributed to polymer chain structures as proposed in real materials.

権利情報:

• https://creativecommons.org/licenses/by-nc/3.0/
  

キーワード: coordination polymer, STM, dynamic behaviour, on-surface, flexibility, single molecule, motion

刊行年月日: 2025-04-28

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• Chemical Science (ISSN: 20416520) vol. 16 issue. 21 p. 9156-9162

研究助成金:

• National Institute for Materials Science JPMXP1224NM5109
• Japan Society for the Promotion of Science 22K04860
• Japan Society for the Promotion of Science 22K05088
• Ministry of Education, Culture, Sports, Science and Technology

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1039/d5sc01949d

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更新時刻: 2025-06-03 16:16:22 +0900

MDRでの公開時刻: 2025-06-04 08:20:16 +0900