A pi-conjugated {C}(3h)-oligomer involving three dithienylethylene branches bridged at the meta positions of a central benzenic core has been synthesized and deposited either on the Si(100) surface or on the highly oriented pyrolytic graphite (HOPG) surface. On the silicon surface, scanning tunneling microscopy allows the observation of isolated molecules. Conversely, when the thiophene rings of the oligomers are substituted with alkyl chains, a spontaneous ordered film is observed on the HOPG surface. As the interaction of the oligomers is different with both surfaces, the utility of the Si(100) surface to characterize individual oligomers prior to their use into a two-dimensional layer is discussed.