Spin-crossover of tris[2-(aminomethyl)pyridine]iron(II) ion in Y-zeolite
Abstract
Mössbauer spectra and magnetic susceptibility measurement of mer-[Fe(amp)3]2+ and fac-[Fe(amp)3]2+[amp = 2-(aminomethyl)pyridine] in supercages of Y-zeolite reveal that mer-[Fe(amp)3]2+ is high-spin even at 78 K whereas the spin-state of fac-[Fe(amp)3]2+ changes gradually from high- to low-spin as the temperature is decreased from 293 to 78 K, suggesting structural restrictions on the complexes in the supercage.