Impact of Dielectric Constant on Binary Complexes of Ca(II), Zn(II) and Mn(II) Ions with L-proline
Binary complexes of Ca(II), Zn(II) and Mn(II) with L-proline was investigated pH-metrically in 1,2-propanediol-water mixtures by maintaining an ionic strength of 0.16 mol.L -1 at 303.0 K. The best-fit chemical models for present study are ML , MLH2 and ML2H for Ca(II), Zn(II) and Mn(II) ions are established from modelling studies using computer program MINIQUAD75. Some errors influence the magnitudes of stability constants and its order is alkali > acid > ligand > metal. The graphical representation of log u03b2 against 1/D of the medium shows that dominance of electrostatic interactions. Distribution diagrams of the various species of the binary complexes in relation to pH at different variations (0.0-60.0% v/v) of propylene glycol-water mixtures were presented.
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