Figure 4.

(a–d) On-surface synthesis of organometallic carbon chains by dehydrogenative coupling of ethyne molecules on a Cu(110) surface. Reprinted with permission from Ref. [55]. (e) C 1s core-level XP spectrum showing the major peak C2 located at a binding energy of 283.2 eV (cyan curve). Copyright 2016, American Chemical Society. (f) On-surface synthesis of organometallic carbon chains by entire debromination of C₄Br₄ molecules followed by homocoupling on Au(111) surface and the transformation from cumulene to diyne moiety via partial debromination induced by STM tip. Reprinted with permission from Ref. [56]. Copyright 2020, American Chemical Society.