• Enthalpy and entropy changes associated with mixed ligand chelates of Cu(II) and Ni(II) with 4-methoxy picolinic acid N-oxide and some amino acids in aqueous medium

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    • Keywords


      4-methoxy picolinic acid N-oxide; amino acids; mixed ligand complexes; formation constants; thermodynamic parameters

    • Abstract


      The stability constants of mixed complexes of Cu(II) and Ni(II) with 4-methoxy picolinic acid N-oxide, and glycine, α-alanine, proline and hydroxy-proline have been determined at various temperatures by the potentiometric method in 0·1 M ionic strength. The formation constants of the mixed complexes have been evaluated and are in good agreement with statistically expected values. The enthalpy and entropy values have been calculated from 1∶1∶1 stability constants temperature coefficient data. From the enthalpy values of the mixed complexes it may be concluded that the bond strengths are not equal to the average of the bond strengths inMA2 andMB2 type parent complexes. The entropy values have been found to be favourable for ternary complex formation.

    • Author Affiliations


      C H Sarala Devi1 M G Ram Reddy1

      1. Department of Chemistry, Osmania University, Hyderabad - 500 007, India
    • Dates

  • Journal of Chemical Sciences | News

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