• R C Aggarwal

      Articles written in Journal of Chemical Sciences

    • 3d-metal complexes of salicylaldehyde ethoxythiocarbonyl hydrazone

      N K Singh S C Srivastva R C Aggarwal

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      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.

    • Magnetic and spectral studies on 3d-metal complexes of acetone(N-isopropylidene)tyrosyl hydrazone

      T R Rao Mamta Sahay R C Aggarwal

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      Acetone(N-isopropylidene)tyrosyl hydrazone, HO-C6H4-CH2-CH(N=CMe2)-CONHN=CMe2 (ath), has been found to form adducts of the typeM (ath) Cl2·nH2O [M = Mn (II), Co (II), Ni (II), Cu (II) and Zn (II);n = 0, 1 or 2] and deprotonated complexes of the type M′(ath-2H) · 3H2O[M′ = Co(II), Ni(II) and Cu(II)]. Molar conductance studies in 0.001 Mdmso solution have indicated the non-ionic nature of the complexes. High-spin octahedral geometry for Mn(II) and Ni(II) complexes and tetrahedral geometry for Co(II) adduct have been proposed on the basis of magnetic and/or electronic spectral studies.ir spectra suggest neutral bidentate and dinegative tridentate behaviour of the ligand in the adducts and deprotonated complexes respectively,esr spectra of Cu(II) complexes indicate zero-field splitting of Cu(ath)C12 · H2O and metal-metal interaction in both the complexes.

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