Articles you may be interested inInvestigating the molecule-substrate interaction of prototypic tetrapyrrole compounds: Adsorption and selfmetalation of porphine on Cu(111) J. Chem. Phys. 138, 154710 (2013); 10.1063/1.4800771 Adsorption geometry, conformation, and electronic structure of 2H-octaethylporphyrin on Ag(111) and Fe metalation in ultra high vacuumThe adsorption of benzene, naphthalene, and anthracene on the TiO 2 (110) surface has been investigated using near edge x-ray absorption spectroscopy ͑NEXAFS͒, x-ray photoelectron spectroscopy, and thermal programmed desorption. For all three adsorbates a planar adsorption geometry is found. In contrast to the bonding of benzene and larger acenes to metal surfaces, we find that the interaction is dominated by electrostatic forces between the adsorbed molecules and the TiO 2 (110) substrate. The fact that the average tilt angle between molecular and surface plane as determined by NEXAFS is substantially different from zero indicates the presence of defect species.