Preparation and characterization of novel [Fe(methylisopropylglyoximato) 2 (amine) 2 ] mixed chelates

A series of novel [Fe(MeiPrGlyoxH) 2 (amine) 2 ] complexes have been synthesized [(MeiPrGlyoxH 2 = methylisopropylglyoxime, amine = 3,5-dimethylpyridine, 4-(dimethylamino)pyridine, 4-(phenylamino)phenol, 2-imidazolidone)] and characterized by 57 Fe Mössbauer, FTIR, UV–Vis spectroscopy, mass spectrometry, AFM and thermoanalytical methods. Quantum chemical (DFT) computations of [Fe(MeiPrGlyoxH) 2 (3,5-dimethyl-Py) 2 ] (Py = pyridine) complex were also performed. The square-planar structure of [Fe(MeiPrGlyoxH) 2 ] moiety is similar to that of [Fe(MeEtGlyoxH) 2 ]. The incorporation of branching alkyl chains (isopropyl) in the complexes alters the Fe–N bond length and results in high-spin iron(II) state.