Berlin 2015 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 12: Inorganic/Organic Interfaces: Growth II
O 12.7: Talk
Monday, March 16, 2015, 16:30–16:45, MA 005
Quantitative test of the “surface trans-effect” in an adsorbed metal-organic complex — •Peter S. Deimel1, David A. Duncan1, Tien-Lin Lee2, Luke A. Rochford3, Pardeep K. Thakur2, D. Phil Woodruff3, Francesco Allegretti1, and Johannes V. Barth1 — 1Physics Department E20, TU München, Germany — 2Diamond Light Source, Didcot, UK — 3University of Warwick, Coventry, UK
On-surface coordination chemistry is an emerging field, which holds promise for nanotechnology, molecular spintronics and catalysis [1]. Previous work provided evidence for a “surface trans-effect” where the interaction [2] and even the magnetic coupling [3] between the metal ion of adsorbed metal-organic species and the underlying substrate can be affected by ligation in trans position. Corresponding marked changes in height of the metal center with respect to the substrate were theoretically predicted [2].
We present the first quantitative analysis of this effect using normal incidence X-ray standing waves. For iron phthalocyanine on Ag(111) we observe a distinct increase in height of the Fe ion upon NH3 ligation, whereas the tetrapyrrole macrocycle is effectively unperturbed. Our results provide a test-bed for modeling schemes and structure-functionality correlations relevant for technological applications.
[1] J. V. Barth, Surface Science 603 (2009), 1533;
J. M. Gottfried and H. Marbach, Z. Phys. Chem. 223 (2009), 53.
[2] W. Hieringer et al., J. Am. Chem. Soc. 133 (2011), 6206.
[3] Ch. Wäckerlin et al., Nat. Commun. 1 (2010), 61.