Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 20: Inorganic/Organic Interfaces: Growth III

O 20.7: Vortrag

Dienstag, 17. März 2015, 12:00–12:15, MA 005

Adsorption Phenomena of Thioether-functionalized {Ni^II₄} Coordination Complexes on Au(111) — •Volkmar Heß¹, Frank Matthes¹, Daniel E. Bürgler¹, Claus M. Schneider¹, Kirill Yu. Monakhov², Claire Besson², Paul Kögerler², Alessio Ghisolfi³, and Pierre Braunstein³ — ¹Peter Grünberg Institute, Electronic Properties (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany — ²Institut für Anorganische Chemie, RWTH Aachen University, 52074 Aachen, Germany — ³Laboratoire de Chimie de Coordination, Université de Strasbourg, 67081 Strasbourg, France

The anchoring and organization of sulfur-containing heterocyclic groups on metallic substrates is still barely explored. The chemical deposition of a cubane-type {Ni^II₄} (=[Ni₄(µ₃-Cl)₄Cl₄(HL·S)₄]) coordination complex terminated by cyclic thioether functional groups from a dichloromethane solution on the Au(111) surface is investigated by STM imaging and surface chemical characterization via XPS, AES, and LEED, both immediately after deposition and after subsequent post-annealing steps. The results provide strong evidence for a partial decomposition of the complex upon deposition on the Au(111) surface that however leaves the magnetic cubane-like {Ni^II₄Cl_4n} (n = 1 or 2) core of the complex intact. Only post-annealing above 500 K induces further decomposition and fragmentation of the {Ni^II₄Cl_4n} core. The detailed insight into the chemisorption-induced decomposition pathway provides guidelines for realizing the deposition of thioether-functionalized molecules on metal surfaces.