Self-Metalation of Phthalocyanine Molecules with Silver Surface Atoms by Adsorption on Ag(110)

摘要

We report that metal-free phthalocyanine (H2PC) Molecules with a central cavity are able to incorporate Ag atoms from an Ag(110) surfaCe thus creating silver phthalocyanine (AgPc). The reaction was investigated by means of scanning tunneling microscopy (STM) under ultrahigh vacuum, and the metalation of H2Pc at the interface was confirmed with X-ray photoelectron spectrokopy.Three different kinds of molecules were found on the surface that are aS.signect to H2Pc, the corresponding dehydrogenated molecules,(Pc), and AgPc. The relativ e amounts of Pc and AgPc increase with increasirig annealing temperature. We suggest that the reaction with Ag atoms from the steps of the surface occurs favorably orily for,already dehydrogenated molecules; thts, the metalation of H2Pc is likely limited by the heatinduced dehydrogenation. DenSity functional theory simutations of the reaction path are presented to corroborate this hypothesis.