SYNTHESIS AND IR SPECTROSCOPIC STUDY OF COMPLEXES OF SELECTED 3D-METALS WITH 2-(PHENYLMETHYL)-1H-BENZIMIDAZOLE

The aim of this study was the synthesis and structural investigation of coordination compounds of selected 3d-metals with 2-(phenylmethyl)-1H-benzimidazole (FAB) using IR spectroscopy. Complexes of copper(II), nickel(II), cobalt(II), and zinc(II) with the general formula [M(FAB)2Cl2], as well as a complex [Co(FAB)2(ac)2], were synthesized. IR spectroscopic analysis revealed that FAB coordinates to metal ions through the nitrogen atom of the benzimidazole ring. Shifts in the ν(C=N), ν(C-N) bands and the appearance of new bands in the 580-430 cm⁻¹ region corresponding to ν(M-N) and ν(M-Cl) confirm the formation of metal complexes. It was established that the [M(FAB)2Cl2] complexes exhibit a tetrahedral geometry, while the [Co(FAB)2(ac)2] complex has an octahedral structure.

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