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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)

O 35.9: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B1

Structural and electronic characterization of an adsorbed SMM building block: Cu₃-triplesalen on Au(111) — •Judith Niedenführ¹, Manuel Steinbrecher¹, Thorsten Glaser², and Daniel Wegner¹ — ¹Westfälische Wilhems-Universität, Münster, Germany — ²Universität Bielefeld, Bielefeld, Germany

Single Molecule Magnets (SMMs) are potential candidates for the application in future technological devices for high-density memory storage and quantum computation. In an attempt to combine a high spin ground state and a large magnetic anisotropy in one molecule, triplesalen complexes are promising building blocks for a new generation of SMMs. For an efficient superexchange interaction, a delocalized aromatic π system in the center of the triplesalen complex is required. However, previous chemical analysis indicates that the central benzene ring inside this complex can change its configuration to cyclohexane, therefore causing a loss of aromaticity. This has a dramatic impact on the magnetic coupling and spin polarization of the triplesalen complex. Employing a combination of Scanning Tunneling Microscopy (STM) and Scanning Tunneling Spectroscopy (STS) we have investigated single Cu₃-triplesalen complexes adsorbed on a Au(111) surface. The relatively large molecules were deposited in situ using a pulse injection technique. A thorough structural and spectroscopic analysis allows us to discuss the electronic properties of the Cu₃-triplesalen complex, with a special focus on the state of the central carbon ring.