Abstract: Four complexes of Mn(Ⅲ)with dianion of bis(benzoylacetone)diimine(abbrev.bzacen^2-)and organic bases:Mn(bzacen)LClO₄,where L is pyrazine,pyridine,γ-methylpyridIne and acetonitrile, have been synthesized.The crystal structure of [Mn(bzacen)(CH₃CN)ClO₄]has been determined by X-ray diffraction method. The crystal is orthohom-bic with a=0.9077(1)nm,b=1.5563(1)nm,c=1.7205(2)nm,V=2.4305nm³,Z=4,D_c=1.48g/cm³,D_m=1.49g/cm³;space group P_nma. The compound has an elongated octahedralstructure. The electronic spectra and infrared spectra of the compounds have been assigned.

Key words: manganese(Ⅲ), bis(benzoylacetone)ethylenediimine, schiff base complex, crystalstructure