Molecular Crystals and Liquid Crystals, Vol.376, 399-404, 2002
Spin-crossover phenomena of iron complexes in the NaTSM intercalation compounds
The spin-crossover phenomena of iron complexes accompany with molecular deformations such as symmetric breathing and trigonal torsion. Thus they can serve as a sensitive probe to molecular surroundings. A confinement effect into interlayer spaces of a clay host compound, NaTSM (sodium fluorotetrasilicic mica), was studied for iron complexes by magnetic susceptibility and 57 Fe Mossbauer spectroscopy. Guest complexes examined are [Fe-III-(amp)(3)](2+) (amp = 2-aminomethylpyridine), [Fe-III (acpa)(2)](+) (Hacpa = N-(1-acetyl-2-propylidene)-2-pyridylmethylamine), and [Fe-III-(sal(2)trien)](+) (H(2)sal(2)trien = N, N'-disalicylidenetriethylenetetramine). A remarkable reduction of the high spin-low spin energy gap in the interlayer space was observed.
Keywords:spin-crossover phenomena;intercalation;sodium fluorotetrasilicic mica;magnetic susceptibility;Mossbauer spectroscopy;DFT calculation