| AVS 56th International Symposium & Exhibition | |
| Surface Science | Thursday Sessions |
| Session SS2-ThM |
| Session: | Electron Activated Molecular Interfaces |
| Presenter: | M. Roos, Ulm University, Germany |
| Authors: | M. Roos, Ulm University, Germany T. Waldmann, Ulm University, Germany H.E. Hoster, Ulm University, Germany R.J. Behm, Ulm University, Germany |
| Correspondent: | Click to Email |
Bis(terpyridine)derivatives (BTP) form highly ordered hydrogen-bonded networks on different substrates at solid surfaces.1,2 Using time resolved scanning tunneling microscopy we have studied selected dynamic phenomena in such adlayers on Au(111) and Ag(111) at around room temperature. Specifically, we have evaluated the mobility of defects in ordered adlayers, exchange of molecules between 2D phases of different local coverage and structure and fluctuations within disordered phases. Such data not only provide important information about typical rates in self assembly processes, but also give quantitative insights into molecular-scale aspects that govern the adlayer thermodynamics. Apart from the balance of molecule-molecule and molecule-substrate interactions, we find a surprisingly high influence of molecular entropy due to rotation and translation on the stability of the distinct phases. We will discuss the relevance of our findings for these particular model systems for the growth and stability of supramolecular structures in general.
1 M. Roos et al., Phys. Chem. Chem. Phys. 9 (2007) 5672.
2 H. E. Hoster et al., Langmuir 23 (2007) 11570.