Abstract
The solid complexes of Cu(II), Ni(II), Co(II), Mn(II) and Fe(III) with Schiff base ligands derived from heterocyclic compounds 3-acetyl-6-methyl-(2H)-pyran-2,4(3H)-dione (Dehydroacetic acid) ando-chloroaniline were synthesized and characterized by elemental analysis, conductance, magnetic, thermal, UV-Vis and1H-NMR spectroscopy. The ligand field parameters have been evaluated for Cu(II), Ni(II), Co(II), Mn(II) and Fe(III) complexes which suggest an octahedral geometry for each of them. The magnetic moment and spectral data suggest the dimeric nature of Mn(II) complexes with octahedral geometry. The fungicidal activities of the ligands and their metal complexes have been screened in vitro againstAspergillus nigerand the percentage inhibition of the metal complexes is found to be increased considerably then that of their corresponding ligands and the order is Cu>Ni>Fe>Mn>Co.
Highlights
Schiff bases are one of the most widely used as chelating ligands in coordination chemistry[1,2]
Literature survey reveals that though some work has been done on the metal complexes of Schiff base derived from dehydroacetic acid with aliphatic amines, hydrazides,thiosemicarbazides have been prepared and studied intensively[3,4]
Much less attention has been focused on the metal complexes of Schiff bases derived from dehydroacetic acid and aromatic amines
Summary
Schiff bases are one of the most widely used as chelating ligands in coordination chemistry[1,2]. Literature survey reveals that though some work has been done on the metal complexes of Schiff base derived from dehydroacetic acid with aliphatic amines, hydrazides, ,thiosemicarbazides have been prepared and studied intensively[3,4]. Much less attention has been focused on the metal complexes of Schiff bases derived from dehydroacetic acid and aromatic amines. Synthesis and characterization of the Schiff bases derived from biologically active dehydroacetic acid and o-chloroaniline (L1). The IR spectra of the ligands and their metal complexes were recorded as KBr pellets on a Perkin Elmer (1430) FTIR spectrophotometer in the range 4000-400 cm-1. The Schiff base ligand 3-(1-(2-chlorophenylimino) ethyl)-6-methyl-3H-pyran-2,4-dione were synthesized by refluxing equimolar solution of dehydroacetic acid and corresponding aromatic amine in 50 mL ethanol on 1 RML Rotamantale for about 4-5 h. The precipitated solid metal complex was filtered off under hot conditions and washed with hot methanol, petroleum ether (40-60 0C) and dried over anhydrous CaCl2 in vacuum desiccators
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