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We report a molecular-scale study of a one-dimensional coordination polymer formed on a Cu(111) surface. A tailored ligand, 2,7-dicyano-9,9-dimethylfluorene (DCF), was designed to reduce interactions with the surface while enabling directional coordination with Cu adatoms. Scanning tunneling microscopy reveals that the resulting DCF-Cu polymer exhibits pronounced flexibility dominated by the CN-Cu–CN coordination angle, which constitutes the primary internal degree of freedom governing the overall chain geometry. Temperature-dependent measurements show the onset of thermal motion above ~40 K for linear chain segments, whereas three-coordinated branches remain immobile up to 71 K, functioning as molecular-scale cross-links. These results directly connect polymer physics concepts with single-molecule motions on surfaces.

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  ©公益社団法人 日本表面真空学会

Keyword: 配位結合ポリマー, 走査型トンネル顕微鏡

Date published: 2026-08-10

Publisher: The Japan Society of Vacuum and Surface Science

Journal:

• 表面と真空 vol. 69 issue. 8 p. 428-433

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6490

First published URL: https://doi.org/10.1380/vss.69.428

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Updated at: 2026-08-28 09:56:31 +0900

Published on MDR: 2026-08-28 12:26:18 +0900