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MSC Colloquium Philipp Gütlich


07 April 2005 FWN-Building 5111.0080, Nijenborgh 4, 9747 AG, Groningen
Philipp Guetlich
Philipp Guetlich
Speaker: Philipp Gütlich
Affiliation: Johannes Gutenberg-Universität Mainz, Mainz, Germany
Title: Spin state switching in iron complexes -- from molecular processes to possible applications
Date: Thu Apr 7, 2005
Start: 16.00 (Doors open and coffee available at 15.30)
Location: FWN-Building 5111.0080


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 [1-5] are among the most fascinating electronic games encountered in 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 in mono-, oligo- and polynuclear iron(II) complexes will be discussed, with special emphasis on the importance of cooperative interactions. It will be shown that switching forth and back between different spin states may be effected by irradiation with light of different wave lengths ('Light-Induced Excited Spin State Trapping (LIESST)'). The effect of pressure on the spin transition behavior will be demonstrated. New activities towards synthesis of systems exhibiting synergic effects are briefly outlined. Possible practical applications will be discussed.


[1] P. Gütlich, A. Hauser, H. Spiering: Thermal and optical switching of iron(II) complexes, Angewandte Chemie International Edition English, 1994, 33, 2024-2054. 

[2] P. Gütlich, A. Hauser, H. Spiering: Spin transition in iron(II) compounds, in: Inorganic electronic structure and spectroscopy Vol. II, A.B.P. Lever, E.I. Solomon (eds.), John Wiley and Sons, 1999, 575-622.

[3] P. Gütlich, Y. Garcia, T. Woike: Photoswitchable coordination compounds, Coordination Chemistry Review, 2001, 219-221, 839-879.

[4] P. Gütlich, Y. Garcia, H. Spiering: Spin transition phenomena, in: Magnetism: molecules to materials IV, J.S. Miller, M. Drillon (eds.), Wiley-VCH, 2003.

[5] P. Gütlich, H.A. Goodwin (eds.): Spin crossover in transition metal compunds I, II, and II, volumes 233, 234, 235, Topics in Current Chemistry, Berlin, 2004.


Light-induced excited spin state trapping (LIESST)
Light-induced excited spin state trapping (LIESST)
Last modified:22 October 2012 2.30 p.m.