Synthesis and crystallographic characterization of new heterotrinuclear oxo-centered complex

Abstract

New oxo-centered trinuclear mixed-metal complex, of [Fe₂ZnO(CHCl₂CO₂)₆(CHCl₂CO₂)₃].NO₃ was synthesized by the direct reaction between metal nitrates and dichloroacetic acid. These compounds have a typical μ₃-oxo trinuclear structure: (a) three metal atoms are situated in the apexes of the equilateral triangle; (b) μ₃-oxygen atom and six dichloroacetate ligands fulfil the bridge functions and (c) the monodentate CHCl₂CO₂ ligands complete the octahedral geometry of the metal ions. This complex were characterized by elemental analyses (CHN), atomic absorption spectroscopy and spectral (IR, electronic) studies. This is new types of oxo-bridged mixed-metal complex in which the carboxylate ligand is dichloroacetic acid. The UV spectra of the complex exhibited strong bands in the region 213 and 257 nm which are related to the (π → π^*) and (n → π^*) transitions of the CHCl₂CO₂ ligands, respectively. The IR spectra of this compound showed two strong stretching vibrations bands, indicating a bridging coordination mode of the carboxylic group by presence of ν_asym (M₂M'O) vibrations of the ligand in the infrared spectra.

KEY WORDS: Oxo-centered, Trinuclear complexes, Carboxylic ligand, Crystallographic data, IR spectra

Bull. Chem. Soc. Ethiop. 2018, 32(3), 491-500.

DOI: https://dx.doi.org/10.4314/bcse.v32i3.8