Electron- and X-ray Spectroscopy on Novel and Classical Charge Transfer Complexes
K. Medjanik, S.A. Nepijko, D. Kutnyakhov and G. Schönhense
Organic charge-transfer (CT) compounds are a class of materials that exhibit a variety of competing interactions between the charge, spin and lattice degrees of freedom, leading to a wide range of interesting physical properties. Metallic conductivity, superconductivity and magnetism result from the high degree of electronic correlation. This thesis focuses on the electronic structure of CT-compounds from three families of materials by applying various photoemission and X-ray techniques. New molecules with tuneable donor and acceptor strength (tailored via functional end groups), synthesized in the MPI für Polymerforschung, serve as building blocks in new CT complexes.
Figure 1: Structures of the coronene-derivatives and the parent molecule (centre), charge density plots and orbital plots of the highest occupied molecular orbitals.
Electronic Structure of Large Disc-Type Donors and Acceptors. K. Medjanik, D. Kutnyakhov, S. A. Nepijko, G. Schönhense, S. Naghavi, V. Alijani, C. Felser, N. Koch, R. Rieger, M. Baumgarten, and K. Müllen, Pys. Chem. Chem. Phys. 12 (2011) 7184-7193
Formation of an Intermolecular Charge-Transfer Compound in UHV Co-Deposited Tetramethoxypyrene and Tetracyanoquinodimethan.K. Medjanik, S. Perkert, S. Naghavi, M. Rudloff, V. Solovyeva, D. Chercka, M. Huth, S. A. Nepijko, T. Methfessel, C. Felser, M. Baumgarten, K. Müllen, H.J. Elmers and G. Schönhense, Phys. Rev. B 82 (2010) 245419
Theoretical Study of Acceptors and Donors Based on Polycyclic Aromatic Molecules. S. Naghavi, T. Gruhn, V. Alijani, G. H. Fecher, C. Felser, K. Medjanik, D. Kutnyakhov, S. A. Nepijko, G. Schönhense, R. Rieger, M. Baumgarten, and K. Müllen, J. Mol. Spec. (2011), in print; and Cond-mat arXiv 1012.3028
Orbital-Resolved Partial Charge Transfer from the Methoxy Groups of Substituted Pyrenes in Complexes with Tetracyanoquinodimethane - a NEXAFS Study. K. Medjanik, S. A. Nepijko, H. J. Elmers and G. Schönhense, P. Nagel, M. Merz, S. Schuppler, D.Chercka, M. Baumgarten, and K. Müllen, Cond-mat arXiv 1012.3467
Study of Charge Transfer Complexes Containing Functionalized p-Conjugated Molecules Using Hard X-ray Photoemission. K. Medjanik, A. Gloskovskii, S. Thiess, H. Schulz-Ritter, W. Drube, D. Chercka, M. Baumgarten, K. Müllen, C. Felser, and G. Schönhense, in preparation
Giant Chemical Shifts of the Sulphur 2s-Line Close to the Glass-Like Transition of the CT Salt k-(BEDT-TTF)2Cu[N(CN)2]Br - a Hard X-ray Photoemission Study. G. Schönhense, M. de Souza, K. Medjanik, A. Gloskovski, H.J. Elmers, J. Müller, and M. Lang, in preparation
Acknowledgements:The project is funded through Transregio SFB TR 49 (Frankfurt, Mainz, Kaiserslautern), the Graduate School of Excellence MAINZ and Centre for Complex Materials (COMATT), Mainz.
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