Growth and Structure of Self-assembled Monolayers of a TTF Derivative on Au(111)

The adsorption of a TTF derivative (2-[9-(1,3-dithrol-2-ylidene)anthracen-10(9H)-ylidene-]-1,3-dithiole, exTTF) on Au(111) has been studied by a combination of scanning tunneling microscopy. photoelectron spectroscopy, and theoretical calculations The results indicate that the molecule-substrate interaction is dominated by the S Au bonds However. due to conformational reasons, only one of the two dithiole rings is in close contact with the surface. As a consequence. the interaction with the Au surface is much smaller (less than half) the interaction of TTF with Au(111), where the four sulfur atoms are in direct contact