Presentation Information
[1C19]Molecular-level visualization of flexibility and motion in coordination polymers on Cu(111) by STM
*Keisuke Sagisaka1, Masayuki Takeuchi1, Waka Nakanishi1 (1. National Institute for Materials Science (NIMS))
Surface-synthesized coordination polymers allow molecular-level study of dynamics via STM, but conventional π-conjugated ligands require high temperatures, disrupting metal-ligand bonds and limiting flexibility studies. Here, a new ligand, 2,7-dicyano-9,9-dimethyl-9H-fluorene (DCF), was used on a Cu(111) surface to form DCF-Cu polymers, preserving coordination and enabling direct STM observation. The polymers mainly showed linear structures with some tri-coordinated branches, and CN-Cu-CN angles had ±20º flexibility. Temperature-dependent STM revealed transitions from static (below 40 K) to mobile (48 K, 71 K), with increased dynamics and bond clevage at strained junctions.