• R K Sharma

      Articles written in Journal of Chemical Sciences

    • Spectral studies of the newly synthesized azomethine derivatives of zirconium(IV)

      R K Sharma R V Singh J P Tandon

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      Equimolar and bimolar reactions of zirconium isopropoxide with bibasic tridentate azomethine (AZH2) having the donor system ONO have been carried out and derivatives of the type Zr(OPr1)2(AZ) and Zr(AZ)2 [Where AZ2− is the anion of the azomethine molecule] have been isolated. The labile nature of the isopropoxy groups in 1∶1 derivatives has been shown by carrying out exchange reactions with equimolar amount of 2-methylpentane-2,4-diol. All the newly synthesized derivatives have been characterized on the basis of elemental analysis, conductance measurements, molecular weight determinations and infrared, ultraviolet, visible and proton magnetic resonance spectral studies.

    • Chelation behaviour of biologically activeo-hydroxy naphthaldehyde derivatives with bivalent metal ions in different solvents: A potentiometric study

      Sahadev R K Sharma S K Sindhwani

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      Equilibria between the derivatives ofo-hydroxy naphthaldehyde and protons or bivalent metal ions have been investigated potentiometrically at constant ionic strength while varying the solvents in definite ratios (solvent: water). The method of Bjerrum and Calvin as modified by Irving and Rossotti (1954) has been used to find the values of$$\tilde n$$ and pL. The formation constants of metal chelates have been calculated using a weighted least squares method. The values of$$S_{\min } = \chi ^2 $$ have also been calculated. The order of stability constants is determined as Mg2+<Mn2+<Cd2+<Pb2+<Zn2+<Co2+<Ni2+<Cu2+<UO22+ Solvent effects on stability constants and comparative studies of both the derivatives ofo-hydroxy naphthaldehyde have been reported.

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