A study of metalloporphyrins and metallophthalocyanines and their co-adsorption on gold(111) using microscopic and spectroscopic methods

Metalloporphyrins (MTPP) and metallophthalocyanines (MPc) are compounds that are intensively studied for their important physical and electronic properties. Scanning tunneling microscopy (STM) allows one to investigate the geometrical structure of monolayers of these compounds. X-ray photoelectron spectroscopy (XPS) and reflection-absorption infrared spectroscopy (RAIRS) provide chemical information such as film composition. Ultraviolet photoelectron spectroscopy (UPS) and scanning tunneling spectroscopy (STS) provide insight into the electronic structure of these compounds. Several metalloporphyrins, as single molecular systems and mixtures of metallophthalocyanines and metalloporphyrins, as bimolecular systems, were studied and are reported here.; It is shown that perfluorination of the metallophthalocyanine (F16MPc) produces remarkable changes in the surface structures of the pure compound and mixtures of F16MPc with MTPP deposited on Au(111). This change was not observed with the all protonated CoPc when co-adsorbed with NiTPP. The simultaneous deposition of F16MPc and NiTPP produces a new, well ordered, two dimensional (2D) compound having a 1:1 composition. This new structure may be the first example of a broad new class of materials. Furthermore, it is possible to extend these systems upward by sequential deposition to produce new three dimensional (3D) materials as indicated by preliminary results.