Berlin 2015 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 32: Spins in organics

DS 32.1: Vortrag

Mittwoch, 18. März 2015, 16:30–16:45, H 0111

Organized nanoscale assemblies of metal-free organic magnets: Electronic structure and stability from ultra high vacuum to air exposure. — •Francesca Ciccullo, Reza Kakavandi, and Maria Benedetta Casu — Institute of Physical and Theoretical Chemistry, Tübingen, Germany

Metal-free organic-based magnets are relatively new materials with open-shell structure that may offer new opportunities for applications based on the presence of spatially delocalized unpaired electrons. Essential tools such as X-ray Photoelectron Spectroscopy (XPS) and Near Edge X-ray Absorption Fine structure (NEXAFS) Spectroscopy are used to study the electronic structure and the paramagnetic character of nitronyl nitroxide radicals. The molecule-substrate interface and the thin film properties are investigated, focusing on their impact on the magnetic character of the systems. Our work also identifies a quantitative correlation between the results obtained by the simultaneous use of X-ray photoemission and electron spin resonance spectroscopy. This result can be used as a standard diagnostic tool in order to link the (in-situ-measured) electronic structure with classical ex-situ paramagnetic investigations.