Magnetic, 57 Fe Mössbauer, and IR Monitoring of the Thermal Spin Transition in a New Family of Iron( II ) Spin‐Transition Complexes

Autor:	Matthias Grunert, Arno F. Stassen, Henk Schenk, Jaap G. Haasnoot, Eva Dova, Wolfgang Linert, Martin Klaus Muller, Peter Weinberger, Jan Reedijk, Günter Wiesinger
Rok vydání:	2003
Předmět:	Inorganic Chemistry Perchlorate chemistry.chemical_compound Crystallography Tetrafluoroborate chemistry Spin crossover Mössbauer spectroscopy Inorganic chemistry Spin transition Infrared spectroscopy Spectroscopy Magnetic susceptibility
Zdroj:	European Journal of Inorganic Chemistry. 2003:2273-2282
ISSN:	1099-0682 1434-1948
DOI:	10.1002/ejic.200200652
Popis:	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. γHS 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-Mossbauer 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)
Databáze:	OpenAIRE
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