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Three new tetrahalogenoferrate (III) complexes with the general formula (R)4N[FeCl3X]– in that (X=F-,Cl-,Br-) synthesized by the reaction of FeCl3 with (C2H5)4NF, (CH3)4NCl and (C4H9)4NBr salts in anhydrous CH3CN. These were characterized by elemental analysis, IR, UV/Visible and 81Br-NMR spectroscopy. The optimized geometries and frequencies of the stationary point are calculated at the B3LYP/LANL2DZ level of theory. Harmonic vibrational frequencies and infrared intensities for FeCl3F-, FeCl4- and FeCl3Br- are studied by means of theoretical and experimental methods. The calculated frequencies are in reasonable agreement with the experiment values

Density functional theory studies on the structure, vibrational spectra of three new tetrahalogenoferrate (III) complexes