• Ch Sarala Devi

      Articles written in Journal of Chemical Sciences

    • Formation constants of binary chelates of Cu(II)/Ni(II) with 4-chloro and 4-amino picolinic acid N-oxide in aquo organic media

      Shiva Raj Ch Sarala Devi G Seshikala M G Ram Reddy

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      The proton ligand constants of 4-chloro and 4-amino picolinic acid N-oxide and the formation constants of corresponding binary chelates of Cu(II) and Ni(II) have been measured at 30°C and 0.1M ionic strength in varying percentages of dioxane-water, acetone-water, ethanol-water and isopropanol-water. The results are discussed with reference to the change in dielectric constants of water in the presence of organic solvent, change in the structuredness of water, change in hydrogen bonding ability of the organic solvent in water, solvent basicity and proton solvation by organic solvent. The values have been compared with aqueous and mixed aqueous systems of picolinic acid N-oxide and 4-methoxy picolinic acid N-oxide.

    • Equilibrium and spectral studies on ligational behaviour of N,N’-diformylhydrazine

      G Bhargavi B Sireesha Ch Sarala Devi

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      The ligand N,N’-diformylhydrazine (DFH) is a resonance hybrid of its keto- and enol-forms. The resonance structures indicate enolisation of one as well as both the carbonyl groups. This indicates the presence of dissociable protons in the molecule. Equilibrium studies carried out with DFH indicate the presence of one dissociable proton. The solid complexes of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and Pb(II) with DFH have been synthesized, and have been characterized by elemental analysis, magnetic susceptibility, IR, Far-IR,1H NMR, TGA, FAB and reflectance spectra. IR and1H NMR spectra of the complexes indicate deprotonation of both the enol protons upon complexation. Elemental and TG analyses of Mn(II), Ni(II), Zn(II) DFH complexes indicate 1:1 metal to ligand composition. The dimeric nature of the Mn(II)-DFH complex is supported by its FAB spectrum.

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