Berlin 2005 – wissenschaftliches Programm

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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.62: Poster

Montag, 7. März 2005, 18:00–20:00, Poster TU A

Design of the electronic structure of poly-MTO — •R. Miller, Ch. Helbig, J. Herrmann, G. Eickerling, K. Tröster, R. Herrmann, E.-W. Scheidt, and W. Scherer — CPM, Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany

Polymeric methyltrioxorhenium (poly-MTO), (CH₃)_xReO₃ (x ≈ 0.92), is the first member of a new class of organometallic hybrids which adopts the structural motives and physical properties of classical perowskites in two dimensions[1]. Several attempts have been undertaken to use its unique chemical properties to design new materials by manipulating its chemical composition. In this study we demonstrate how the electronic structure of poly-MTO can be tailored by intercalation of organic and organo metallic donor molecules such as tetrathiafulvalene (TTF) [2] and Cobaltocen (CoCp2). With increasing TTF/CoCp2 intercalation the metallic behavior of the parent compound (CH₃)_xReO₃·D_y (D = TTF or CoCp2) becomes suppressed leading to an insulator at donor concentrations y larger than 0.5. Specific heat, electric resistance and magnetic susceptibility studies indicate that an increasing amount of TTF/CoCp2 causes the itinerant electrons of the poly-MTO matrix to localize. [1] W. A. Herrmann, W. Scherer, R. W. Fischer, J. Blümel, M. Kleine, W. Mertin, R. Gruehn, J. Mink, H. Boysen, C. C. Wilson, R. Ibberson and L. Bachmann, J. Am. Chem. Soc 117., 3231, (1995). [2] R. Miller, Ch. Helbig, G. Eickerling, R. Herrmann, E.-W. Scheidt and W. Scherer, Physica B, in print.