Potentiometric and IR spectral studies of Binary and ternary complexes of La3+, Sm3+, Gd 3+ and Dy3+ with all cis-1,2,3,4-cyclopentanetetra carboxylic acid(CPTA) and Furan-2-carboxylic acid(FCA)

The stability constants of 1:1 binary complexes of some lanthanide metal ions like La3+, Sm3+, Gd 3+ and Dy3+ with all cis-1,2,3,4-cyclopentanetetra carboxylic acid(CPTA) and Furan-2-carboxylic acid (FCA) and ternary complexes of them with all cis-1,2,3,4-cyclopentanetetra carboxylic acid(CPTA) as a primary ligand and Furan-2-carboxylic acid (FCA) as secondary ligand were determined potentiometrically at constant ionic strength m=0.2M(KNO3) in aqueous solution at 300C,400Cand 500C. The stability constants calculated follows the order: La3+ < Sm3+ < Gd3+ ≈ Dy3+ . The thermodynamic parameters like free energy (DG0), enthalpy (DH0) and entropy (DS0) have also been calculated using the standard thermodynamic equations.The infra red studies of 1:1 binary complexes of La3+, Sm3+, Gd 3+ and Dy3+ with all cis-1,2,3,4-cyclopentanetetra carboxylic acid (CPTA)and Furan-2-carboxylic acid (FCA) were also carried out.

Author(s): Richa Gupta, Nisha Agrawal and K. C. Gupta

Abstract | PDF

Share This Article