Berlin 2005 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 34: Novel materials II
CPP 34.3: Vortrag
Mittwoch, 9. März 2005, 11:45–12:00, TU C230
Electronic structure of heteronuclear metal-organic supramolecules — •Rainer Fink1, Norman Schmitt1, Rolf Saalfrank2, and David Batchelor3 — 1Univ. Erlangen, Physikalische Chemie II, Egerlandstr. 3, 91058 Erlangen — 2Univ. Erlangen, Inst.f.organische Chemie, Henkestr. 42, 91054 Erlangen — 3Univ. Würzburg, Experimentelle Physik II, Am Hubland, 97074 Würzburg
Supramolecular aggregates containing ferromagnetic atoms are attracting increased interest due to potential applications in quantum computing and spintronics (spin tunneling). We have prepared thin films of various types of molecules containing a distinct number of Fe and Mn atoms. The 6-fold heteronuclear substances are also known as "ferric wheels". In these molecules the metal atoms couple antiferromagnetically but may nevertheless lead to a resulting magnetic moment with interesting magnetic properties [1]. Depending on the preparation from the solvent, we observe different film morphologies, which also exhibit different electronic properties as monitored by near-edge x-ray absorption fine structure (NEXAFS). In particular the absorption data of the metal edges allow detailed insight into the valency of the metal atoms, and the influence of the organic ligand shell. Spatially resolved spectromicroscopy data of these materials allow structure-property relationships which may be due to the different chemical reactivity of nanocrystalline films. This work is funded by the DFG within SFB 583 (TP C9).
[1] O. Waldmann et al., Phys. Rev. Lett. 89 (2002) 246401