On-surface covalent coupling of organic precursors to form 0D, 1D, or 2D stable molecules has revealed in the past five years as a potentially powerful way of synthesizing molecular devices difficult or impossible to prepare in solution.So far, this technique has mainly been limited to metallic surfaces or 1ML insulating films on metal, and has allowed for instance to obtain 1D and 2D porphyrin oligomers, nanographene ribbons,polymeric Fe-phthalocyanine single layers and so on [1].