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Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 9: Nanostructures at Surfaces I

O 9.6: Talk

Monday, March 7, 2016, 11:45–12:00, H6

Probing reactive metal atoms on functionalized surfaces by porphyrin metalationJan Nowakowski1, Sylwia Nowakowska2, Gitika Srivastava1, •Milos Baljozovic1, Jan Girovsky1, Nirmalya Ballav3, and Thomas A. Jung11Paul Scherrer Institute, Villigen, Switzerland — 2University of Basel, Switzerland — 3IISER Pune, India

On-surface metalation of porphyrins has been established on a wide range of surfaces including atomically clean metallic substrates [1] as well as metal-oxides [2] and metallic surfaces modified by oxygen [3]. In this contribution [4], we use the well-studied metalation reaction to present evidence that Cl- and N-induced modifications of the top-most surface layer (i.e. adsorbate-induced surface superstructures) on Cu(001) have decisive and contrasting impact on the reactivity of the surface, as well as on molecular self-assembly. The N superstructure facilitates the metalation reaction and self-assembled domains of CuTPP are formed at room temperature. On the contrary, the Cl superstructure fully inhibits the reaction and causes 2HTPP to assemble into small 'magic' clusters. A spectro-microscopy correlation approach combining X-ray Photoelectron Spectroscopy, Ultraviolet Photoelectron Spectroscopy, Low Energy Electron Diffraction and Scanning Tunnelling Microscopy has been used in this study.

[1] Auwärter, W. et al., ChemPhysChem 8, 250 (2007); [2] Wang, C. et al., Chem Commun 50, 8291 (2014); [3] Nowakowski J. et al., Chem. Commun., 49, 2347 (2013); [4] Nowakowski J. et al., submitted.

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