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On-Surface Synthesis of Five-Membered Copper Metallacycles Using Terminal Alkynes.

Zhanbo LiYule WangLiding ZhangZhi ChenJohannes V BarthJuan LiTao Lin
Published in: Langmuir : the ACS journal of surfaces and colloids (2024)
We present our studies on the adsorption, deprotonation, and reactions of 4,4″-diethynyl-1,1':4',1″-terphenyl on Cu(111) under ultrahigh-vacuum conditions using scanning tunneling microscopy combined with density functional theory calculations. Sequential annealing treatments induce deprotonation of pristine molecules followed by chemical reactions, resulting in branched nanostructures. Within the nanostructures, a previously unreported, double-spot linkage is observed. Our density functional theory calculations unravel that this linkage corresponds to a five-membered copper metallacycle.
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