Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 10: FV-internes Symposium "Molecular Magnetism" (Organizer: H.J. Krüger)

MA 10.7: Hauptvortrag

Samstag, 5. März 2005, 12:00–12:30, TU H1012

Switchable Molecules — •Philipp Gütlich — Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, Staudingerweg 9, 55099 Mainz, Germany

Coordination compounds of transition metal ions with open-shell electron configurations may exhibit dynamic electronic structure phenomena, depending on the nature of the coordinating ligand sphere. Thermal, light- and pressure-induced changes of spin states [1-3] are among the most fascinating electronic games encountered in molecular magnetism of transition metal compounds, which are presently under extensive study by chemists and physicists. The switching properties make such material potential candidates for practical applications in thermal and pressure sensors as well as optical devices. The basics of thermal and optical spin transition will be briefly reviewed. Selected examples of thermal spin crossover complexes will be discussed.It will be shown that switching forth and back between different spin states may be effected with light of different wave lengths. The effect of pressure on the spin transition behaviour will be demonstrated. Possible practical applications will be discussed.

[1] P. Gütlich, Y. Garcia, T. Woike: "Photoswitchable Coordination Compounds" Coord.Chem. Rev. 219-221 (2001) 839-879 [2] P. Gütlich, Y. Garcia, H. Spiering: "Spin Transition Phenomena", in: Magnetism: Molecules to Materials IV, J.S. Miller, M. Drillon (eds.), Wiley-VCH 2003 [3] P. Gütlich, H. A. Goodwin (eds.), "Spin Crossover in Transition Metal Compounds", Topics in Current Chemistry, volumes 233, 234, 235, Springer 2004, Berlin-Heidelberg-New York.