This indicates that the surface can also have an important role on the orientation of the organic species. For the upright EG and GL on the anatase TiO2 surface, the Ti-O distance between Ti of TiCl4 and the oxygen atom of the anatase TiO2 surface is 1.77 Å. This distance decreases to 1.75 Å when EG and GL change their configuration to lying flat. For EG in the upright and flat laying configuration on the rutile TiO2 surface the Ti-O distance between Ti of TiCl4 and the oxygen atom is 1.77 Å. For GL in the upright and flat lying configuration on the rutile TiO2 surface this distance is 1.76 Å.