• N K Singh

      Articles written in Journal of Chemical Sciences

    • 3d-metal complexes of salicylaldehyde ethoxythiocarbonyl hydrazone

      N K Singh S C Srivastva R C Aggarwal

      More Details Abstract Fulltext PDF

      Salicylaldehyde ethoxythiocarbonyl hydrazone (H2L) forms adducts as well as deprotonated complexes having 1:1 or/and 1:2 metal ligand ratio with the metal ions VO(IV), Ni(II), Co(III), Cu(II), Zn(II), Mn(II) and Fe(II). Based on magnetic,esr, electronic, infrared andnmr spectral measurements, structures have been assigned to all the compounds,ir spectral studies show neutral bidentate behaviour of the ligand in the adducts and uninegative/binegative tridentate behaviour in the deprotonated complexes, the bonding sites being azomethine nitrogen and thione sulphur in the former type of complexes and phenolate oxygen, azomethine nitrogen and thione/thiolate sulphur in the latter type.

    • Transition metal derivatives of 3-4-diphenyl-5-mercapto-l,2,4-triazole

      J Singh N K Singh

      More Details Abstract Fulltext PDF

      Neutral chelates of 3,4-diphenyl-5-mercapto-l,2,4-triazole (DPMTH) with Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) have been prepared and characterized by analytical and physicochemical techniques such as magnetic susceptibility measurements, TGA, electronic ESR and IR spectral studies. The IR data suggest that DPMTH behaves as a uninegative bidentate ligand in all the complexes except Fe(II) and Ni(II) where it is tridentate. The complexes have been found to display significant antifugal activity againstA. ahernata andA. flavus.

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