PHYSICOCHEMICAL STUDIES OF MANGANESE (II) AND COPPER (II) COMPLEXES AND THEIR ADDUCT

Abstract

 Bis(salicylaldehydato) manganese (II) and Bis(4,4,4-trifluoro-1-(2-Naphthyl)-1,3-butanedionato) copper(II),  their 2,2'-bipyridine, ethylenediamine, 1,10-phenanthroline and tetramethylethylenediamine adducts have been synthesized and characterized by metal analysis, FT-IR, UV–Visible, magnetic susceptibility and antimicrobial activity. The complexes and adducts were obtained as brown, yellow or light green colour. The metal analyses were in close agreement with the theoretical values expected. The infrared spectra of the manganese(II) complex revealed the coordination of salicylaldehyde through the carbonyl group and the hydroxyl group, while 2,2'-bipyridine, ethylenediamine, 1,10-phenanthroline and tetramethylethylenediamine coordinated to the metal through the nitrogen atoms. The magnetic moment data suggests low-spin octahedral geometry for [Mn(sal)₂(H₂O)₂] (μ_eff = 2.14 B.M), high-spin octahedral geometries for [Mn(sal)₂(en)].5H₂O (μ_eff = 5.50 B.M), [Mn(sal)₂(phen)] (μ_eff = 6.2 B.M),[Mn(sal)₂bipy](μ_eff =5.95 B.M)  and [Mn(sal)₂(tmen)](μ_eff =5.98 B.M.). The electronic measurements are indicative of a probable four-coordinate square planar geometry for [Cu(tfnb)₂] while five-coordinate square pyramidal geometry are proposed for the copper(II) adducts. The complexes and adducts were screened against various bacteria and fungi. The copper complex and adducts were moderately active against fungal strain except [Cu(tfnb)₂] and [Cu(tfnb)₂en] in Aspergillus niger which showed pronounced activity and resistance respectively