▎ 摘　　要

The adsorption of metal phthalocyanine (MPc) layers (M = Fe, Co, Cu) assembled on graphene/ Ir(111) is studied by means of temperature-programmed X-ray photoemission spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS). The balance between interaction forces among the organometallic molecules and the underlying graphene gives rise to flat-lying molecular layers, weakly interacting with the underlying graphene. Further MPc layers pile up face-on onto the first layer, up to a few nanometers thickness, as deduced by NEXAFS. The Fe Pc, Co Pc, and Cu Pc multilayers present comparable desorption temperatures, compatible with molecule molecule interactions dominated by van der Waals forces between the pi-conjugated macrocycles. The MPc single layers desorb from graphene/Ir at higher temperatures. The Cu Pc single layer desorbs at lower temperature than the Fe Pc and Co Pc single layers, suggesting a higher adsorption energy of the Fe Pc and Co Pc single layers on graphene/Ir with respect to Cu Pc, with increasing molecule substrate interaction in the order E-CuPc < E-Fepc similar to E-CoPc.