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New Octahedral, Head–Tail Iron(II) Complexes with Spin Crossover Properties
Author(s) -
Schlamp Stephan,
Thoma Peter,
Weber Birgit
Publication year - 2012
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.201101096
Subject(s) - chemistry , alkyl , spin crossover , crystallography , pyridine , ligand (biochemistry) , spin transition , octahedron , schiff base , stereochemistry , medicinal chemistry , crystal structure , organic chemistry , biochemistry , receptor
The synthesis and characterisation of four new Schiff base‐like ligands with long alkyl chains in the outer periphery and their iron(II) complexes with methanol and pyridine as axial ligands is reported. Two of the methanol complexes crystallise in a lipid layer‐like arrangement with the alkyl chain (tail) packed in the middle and the iron centres (head) in the outer sites. The pyridine complexes show varying types of spin transition (step wise, incomplete, with hysteresis), which depends on the alkyl chain length and substituents in the outer periphery of the ligand. Investigations in solution using 1 H NMR spectroscopy demonstrate that the differences in the spin transition behaviour are due to packing effects as the same transition curve is obtained independently of the alkyl chain length.