Complexation Behaviour and Thermodynamic Parametric Study of Lanthanone(iii) Ions with n, n-dimethylbiguanide

The of complexation stability constants and thermodynamic parameters (ΔG, ΔH and ΔS) of binary Lanthanide(III) complexes where M = La(III) or Ce(III) or Pr (III) or Nd(III) or Sm(III) or Gd(III) or Dy(III) and L = N,Ndimethylbiguanide have been studied using Irving – Rossotti titration technique at ionic strength 0.2M in aqueous media at (30, 40, 50) ± 0.1ºC. The stability constant values (logβn) have been calculated by BEST program. The order of stability for complex is found as La(III) < Ce(III) < Pr(III) < Nd(III) < Sm(III) > Gd(III) < Dy(III). This order can be explained on the basis of basicity of ligand, electronic configuration of metal ions, size and ionic potential of tripositive ion, charge/size ratio of metal ions, gadolium break and species distribution diagrams. The mechanism through which protonation and complex formation takes place has also been discussed. Species distribution curves of complexes have been plotted using SPEPLOT program to visualize the presence of various species in thermodynamically equilibrium system

Author(s): Jayesh Ramani, Jasmin Bhalodia, Mathurjya Neog and Sangita Sharma

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