Magnetic and Mössbauer studies of a 5T–1A equilibrium in some iron(II)–2-(2-pyridyl)imidazole complexes

Abstract

The preparation of 2-(2-pyridyl)imidazole (pyim) complexes of the type [Fe pyim₃]X [where X = SO₄,2H₂O, SO₄,3H₂O, Cl₂,2·5H₂O, SeO₄,H₂O, S₂O₃,4H₂O, (SCN)₂,2H₂O, (ClO₄)₂,2H₂O, or (BPh₄)₂,3H₂O] is described. The magnetic susceptibilities of these compounds are reported for the temperature range 90–300°K, and Mössbauer spectra have been recorded for the sulphate trihydrate, chloride, and thiocyanate at room temperature, 70°K, and 1·4–4°K. The results are shown to be consistent with the existence of a ⁵T–¹A equilibrium.