Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 44: Joint Session "Spins in Organic Materials" (jointly with DS)

MA 44.5: Vortrag

Donnerstag, 29. März 2012, 17:45–18:00, H 1012

Nanoscale assembly and order of paramagnetic organic radicals — Sabine-Antonia Savu¹, Indro Biswas¹, Mathias Glaser¹, Lorenzo Sorace², Matteo Mannini², Andrea Caneschi², Thomas Chassé¹, and •Maria Benedetta Casu¹ — ¹IPTC, University of Tübingen, Tübingen, Germany — ²LAMM, University of Florence, Florence, Italy

Nitronyl nitroxide radicals are a class of paramagnetic compounds that are of interest not only because of their magnetic properties but also because of their use as a building block in more complex magnetic structures. A crucial aspect is the possibility to grow thin films, down to the submonolayer regime, investigating their chemical, physical, and morphological properties. In this work we present X-ray photoelectron spectroscopy (XPS), near edge X-ray absorption fine structure (NEXAFS), atomic force microscopy (AFM), and electron paramagnetic resonance (EPR) investigations of thin films of a pyrene derivative of the nitronyl nitroxide radical (nitpyrene). Nitpyrene was deposited on Au(111) single crystals, using strictly controlled evaporation conditions. The electronic structure and the interaction with the surface are discussed, as well as the growth mode. The persistence of the paramagnetic character of the molecules has been proved by EPR measurements.