Synthesis and Characterization of Two New Oxo-centered Trinuclear Complexes of Manganese and Iron

Subject Areas :

Haman Tavakkoli ¹ , Arezoo Ghaemi ² , Iman Khosravi ³

1 - Department of Chemistry, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 - Department of Chemistry, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
3 - Department of Chemistry, Qeshm Branch, Islamic Azad University, Qeshm, Iran

Received: 2022-05-29 Accepted : 2022-05-29 Published : 2022-03-01

Keywords: IR spectra, oxo-centered, trinuclear complexes, carboxylic ligand,

Abstract :

Two new oxo-centered trinuclear complexes, one of them a mixed-valence complex [Mn2MnO(CCl3CO2)6(Py)3] (1) and the other, mixed-metal complex of [Fe2MnO(CCl3CO2)6(H2O)3].NO3 (2) were synthesized by the direct reaction between metal nitrates and trichloroacetic acid. These complexes were characterized by elemental analyses (CHN), atomic absorption spectroscopy and spectral (IR, electronic) studies. These are new type of oxo-bridged mixed-metal complexes in which the carboxylate ligand is trichloroacetic acid. The UV spectra of the complexes exhibited a strong band in the region 213 and 257 nm which is related to the (π → π*) and (n → π*) transitions of the pyridine and H2O ligands, respectively. The IR spectra of these compounds showed two strong stretching vibrations bands, indicating a bridging coordination mode of the carboxylic group of the ligand in the complexes.