Influence of chlorine substitution on the self-assembly of zinc phthalocyanine.
The adsorption and ordering of zinc phthalocyanine (ZnPc) and octachloro zinc phthalocyanine (ZnPcCl(8)) on an Ag(111) surface is studied in situ by scanning tunneling microscopy under ultrahigh vacuum. Two-dimensional self-assembled supramolecular domains are observed for these two molecules. We show how substituting chlorine atoms for half of the peripheral hydrogen atoms on ZnPc influences the self-assembly mechanisms. While intermolecular interactions are dominated by van der Waals forces in ZnPc molecular networks, ZnPcCl(8) molecular packing undergoes a sequential phase evolution driven by the creation of C-Cl...H-C hydrogen bonds between adjacent molecules. At the end of this evolution, the final molecular assembly involves all possible hydrogen bonds. Our study also reveals the influence of molecule-substrate interactions through the presence of fault lines generating a stripe structure in the molecular film.
Koudia
Mathieu
M
Laboratoire de Matériaux et Microélectronique de Provence (L2MP), UMR CNRS 6137, Universités Paul Cézanne, Provence et Sud Toulon Var, Case 151, Marseille, France. mathieu.koudia@12mp.fr
Abel
Mathieu
M
Maurel
Christian
C
Bliek
Ariane
A
Catalin
Daniel
D
Mossoyan
Mireille
M
Mossoyan
Jean-Charles
JC
Porte
Louis
L