Tailoring On-Surface Molecular Reactions and Assembly through Hydrogen-Modified Synthesis: From Triarylamine Monomer to 2D Covalent Organic Framework
Zachery A. Enderson, Harshavardhan Murali, Raghunath R. Dasari, Qingqing Dai, Hong Li, Timothy C. Parker, Jean‐Luc Brédas, Seth R. Marder, Phillip N. First
A trace of hydrogen can decide whether a molecular layer grows into a large, connected network, or stops as separate pieces. Stranger still, the same effect can be used to make useful intermediate structures on purpose. A tiny change in the vacuum environment, atomic hydrogen from a hot filament, can stop a two-dimensional framework from growing. But the same chemical interference can also become a precise way to make monomers, dimers, and molecular hexamers from one precursor.