Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Metal substrates: Adsorption of organic / bio molecules I

O 6.7: Vortrag

Montag, 22. März 2010, 12:45–13:00, H36

A new charge-transfer complex in UHV-deposited tetramethoxypyrene and TCNQ — •Katerina Medjanik1, Sergej Nepijko1, Gerd Schönhense1, Milan Rudloff2, Vita Solovyeva2, Michael Huth2, Shahab Naghavi3, Claudia Felser3, Martin Baumgarten4, and Klaus Müllen41Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany — 2Physikalisches Institut, Goethe-Universität, 60438 Frankfurt, Germany — 3Institute für Analytische und Anorganische Chemie, Johannes Gutenberg-Universität, 55099 Mainz, Germany — 4Max-Planck-Institute for Polymer Research, 55128 Mainz, Germany

A study of the UHV-deposited mixed phase of tetramethoxypyrene (TMP) and TCNQ has been performed using UPS, X-ray-diffraction, and infrared spectroscopy. Formation of a new intermolecular compound is evident from the appearance of new reflexes in XRD (d1=0.911 nm, d2=0.684 nm). In UPS characteristic shifts of the level positions indicate a charge transfer from TMP to TCNQ, being suggested also by the softening of the CN stretching vibration of TCNQ visible in IR spectroscopy (shift by 7 cm−1). The size of the level shift is similar to shifts observed for the acceptor-donor pair hexaketo-/hexamethoxycoronene. In SEM and AFM micro crystals with sizes in the sub-micrometer range are visible, similarly as previously found for BEDT-TTF / TCNQ [1]. A DFT calculation serves as guideline for interpretation of the spectra. Project funded via Transregio SFB TR49 and Graduate School of Excellence MAINZ.

[1] V. Solovyeva et al., Thin Solid Films 517, 6671 (2009)

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