Abstract
The Schiff bases, potassium salt of salicylidene-β-alanine [KHL], bis(benzylidene)ethylenediamine [SB1] and thiophene-o-carboxaldene-p-toluidine [SB2], and mixed-ligand complexes with Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) have been prepared. They were characterized by elemental analyses, magnetic susceptibility measurements, thermogravimetric analyses (t.g.a.), infrared spectra and electronic spectra. The mixed-ligand complexes were found to have the general composition [M(L)(SB)(H2O)]. All the mixed-ligand complexes were found to have six-coordinated octahedral geometry. The fungitoxic activity of the ligands, metal salts, control (DMSO), bavistin, emcarb, and mixed-ligand complexes were screened against Aspergillus niger, Fusarium oxysporum and Aspergillus flavus. All the mixed-ligand complexes show higher fungitoxic activity as compared to the Schiff bases, metal nitrate and control (dimethyl sulphoxide, DMSO), and moderate fungitoxic activity as compared to the fungicides (bavistin and emcarb).
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