Synthesis, Characterization, Spectral Studies andAntifungal Activity of Mn(II), Fe(II), Co(II), Ni(II),Cu(II) and Zn(II) Complexes with 2-(4-Sulphophenylazo)-1,8-Dihydroxy-3,6-NapthaleneDisulphonic Acid Trisodium Salt

摘要

Complexes of the type Na6[M(HL)2(H2O)2], where M= Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)and Na3H2L= 2-(4-sulphophenylazo)-1,8-dihydroxy 3,6 naphthalene disulphonic acid trisodium salt, havebeen synthesized and characterized by physico-chemical (elemental analyses, solubility, electrolyticconductance, magnetic susceptibility measurement) and spectral (UV-Visible, IR, ESR, powder x-raydiffraction) techniques for their structure and studied for their antifungal activity against ten fungi. Theanionic 1:2 metal:ligand complexes show octahedral geometry around M(II), a significant antifungal activityagainstCurvularia lunataandAlternaria triticinaand a moderate activity againstAlternaria brassicicola,Alternaria brassicae,Alternaria solanae,Curvularia species,Helminthosporium oryzae,Collectotrichumcapsici,Aspergillus niger,Aspergillus flavusandFusarium udum.