Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 77: Organic Molecules on Inorganic Substrates V: Solid-Liquid Interfaces, Self-Organization, Ordering

O 77.8: Vortrag

Donnerstag, 4. April 2019, 12:15–12:30, H9

Aurophilic interactions on surfaces — •Thorsten Wagner1, Michael Brunthaler1, Michael Györök1, Petra Gründlinger1, Uwe Monkowius2, and Peter Zeppenfeld11Institute of Experimental Physics, Johannes Kepler University, Linz, Austria — 2School of Education, Johannes Kepler University, Linz, Austria

Metallophilicity describes attractive interactions between two or more metal atoms with closed shell configurations (i.e. d8, d10). Metal complexes containing gold in the formal oxidation state +I exhibit a very strong interaction of this kind, which is often decisive for their arrangement in the solid state [1,2]. To study this aurophilic interaction on surfaces, we prepared by physical vapor deposition films with a thickness of just a few layers of 2-naphthyl-isonitrile-gold(I)-chloride on Au(111) and Au(110) surfaces. The deposition was monitored by differential reflectance spectroscopy (DRS) and photoelectron emission microscopy (PEEM). After growth, the structure was characterized by means of scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). In the case of the Au(111) substrate, we are able to confirm an anti-dimer structure similar to the bulk one demonstrating that the Au-Au interaction is preserved in the ultrathin films. For the Au(110) substrate, we did not observe the characteristic crossed swords arrangement [2]. In fact, the (1×2) reconstruction of the substrate surface is lifted upon adsorption of the molecules suggesting a sizable interaction between Au(I) complexes and Au substrate.

[1] P. Pyykkö, Chem. Rev. 97, 597 (1997).

[2] E. Hobbollahi et al., Inorg. Chem. Com. 65, 24 (2016).

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