Figure 18.

Influence of the substrate nature. (a) The Ext-TEB precursor experiences a homocoupling reaction on Au(111) but a cyclotrimerization reaction on Ag(111) (b), with an advancement controlled by the annealing temperature. (c) The low diffusivity and high reactivity of Pt(111) surfaces induces a cyclodehydrogenation reaction of the individual precursors (reaction path a) while a dehydrogenative polymerization (reaction path b) is obtained for the same two precursors on the poorly reactive and highly diffusing Au(111) surface. (a) Adapted with permission from refs (61 and 140). Copyright 2016 and 2013 Springer Nature. (b) Adapted with permission from refs (61 and 239). Copyright 2016 and 2014 Royal Society of Chemistry. (c) Adapted with permission from ref (221). Copyright 2013 American Chemical Society.