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Magnetic, 57 Fe Mössbauer, and IR Monitoring of the Thermal Spin Transition in a New Family of Iron( II ) Spin‐Transition Complexes
Author(s) -
Stassen Arno F.,
Grunert Matthias,
Dova Eva,
Müller Martin,
Weinberger Peter,
Wiesinger Günter,
Schenk Henk,
Linert Wolfgang,
Haasnoot Jaap G.,
Reedijk Jan
Publication year - 2003
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200200652
Subject(s) - chemistry , spin crossover , spin transition , mössbauer spectroscopy , crystallography , spin (aerodynamics) , perchlorate , transition metal , spectroscopy , atom (system on chip) , tetrafluoroborate , halogen , inorganic chemistry , ion , organic chemistry , alkyl , physics , quantum mechanics , computer science , embedded system , engineering , aerospace engineering , catalysis , ionic liquid
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 T 1/2 are high compared to the unsubstituted (1‐alkyltetrazole)iron( II ) complexes. The shape of the spin‐transition curve (i.e. γ 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 57 Fe‐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)