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O: Fachverband Oberflächenphysik

O 96: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures VI

O 96.8: Vortrag

Donnerstag, 15. März 2018, 17:00–17:15, MA 004

Molecular adsorption of 5, 15-diphenylporphyrin on CoO (111) films — •Feifei Xiang and M. Alexander Schneider — Solid State Physics, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany

The adsorption geometry of 5, 15-diphenylporphyrin (2H-DPP) on a ~2.7 nm thick CoO (111) film is studied by low temperature scanning tunneling microscopy. Although CoO is a semiconductor, the oxygen terminated CoO (111) film shows metallic properties according to scanning tunneling spectroscopy data.[1] When deposited at 170 K, 2H-DPP adsorbs as single, flat-lying molecules on the surface due to the hydrogen bonding between the molecule and the surface.[2] With annealing of the molecular adsorbate system, 2H-DPP starts to have reactions with the oxide surface, causing the characteristic changes of its configuration from the original oval shape to a bean shape and eventually to a symmetric feature with reduced apparent molecular width at 470K. From comparison with Co-DPP deposited on CoO (111), we conclude that 2H-DPP gets metalated at around room temperature.

[1] Meyer, W., et al. Phys. Rev. Lett., 2008, 101, 016103.

[2] Wang, C., Chem. Commun., 2014, 50, 8291-8294.