[Zurück]

A.F. Stassen, M. Grunert, E. Dova, M. Müller, P. Weinberger, G. Wiesinger, H. Schenk, W. Linert, J.G. Haasnoot, J. Reedijk:
"Magnetic, ⁵⁷Fe Mössbauer, and IR monitoring of the thermal spin transition in a new family of iron(II) spin transition complexes";
European Journal of Inorganic Chemistry, (2003), S. 2273 - 2282.

Magnetic, 57Fe Mössbauer, and IR Monitoring of the Thermal Spin Transition in a New Family of Iron(II) Spin-Transition Complexes
Arno F. Stassen 1, Matthias Grunert 2, Eva Dova 3, Martin Müller 4, Peter Weinberger 4, Günter Wiesinger 4, Henk Schenk 3, Wolfgang Linert 2, Jaap G. Haasnoot 1 *, Jan Reedijk 1
1 Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P. O. Box 9502, 2300 RA Leiden, The Netherlands, Fax: (internat.) + 31-71/527-4671
2Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
3 Institute of Molecular Chemistry, Laboratory of Crystallography, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands
4Institute of Solid State Physics, Vienna University of Technology, Hauptstrasse 8-10/131, 1040 Vienna, Austria
email: Jaap G. Haasnoot (haasnoot@chem.leidenuniv.nl)

*Correspondence to Jaap G. Haasnoot, 1 Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P. O. Box 9502, 2300 RA Leiden, The Netherlands, Fax: (internat.) + 31-71/527-4671

Keywords
Spin crossover ? Iron ? Tetrazole ligand ? Mössbauer spectroscopy ? Variable-temperature IR spectroscopy

Abstract
A new family of iron(II) tetrafluoroborate and perchlorate spin-crossover compounds has been synthesised and is discussed. The iron(II ) ion is surrounded by six 1-ethyltetrazole ligands, which are halogen-substituted on the C2 atom of the ethyl group. The spin-crossover temperatures T1/2 are high compared to the unsubstituted (1-alkyltetrazole)iron(II) complexes. The shape of the spin-transition curve (i.e. <http://www3.interscience.wiley.com:80/giflibrary/12/gamma.gif> HS vs. T ) varies largely over the different complexes and appears to be influenced neither by the crystal packing, nor by the electronic effects. The temperature-dependent spin-transition behaviour has been studied by magnetic susceptibility and by 57Fe-Mössbauer spectroscopy. These data have been supported by temperature-dependent mid-range infrared spectroscopy: the thermally induced spin transition has been observed by direct monitoring of the aromatic C-H stretching frequency. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

http://www3.interscience.wiley.com/cgi-bin/abstract/104537960/ABSTRACT