Mixed ligand chelates of Cd2+ with 2-(1-(aminomethyl)cyclohexyl) acetic acid and dicarboxylic acids

The nature of mixed ligand chelates of cadmium(II) ions with 2-(1-(aminomethyl)cyclohexyl) acetic acid as a secondary ligand and dicarboxylic acids such as oxalic (ox), malonic (mal), succinic (suc), glutaric (glu), adipic (adi) and phthalic (phth) acids as primary ligands was investigated by potentiometric technique at 32 °C (± 0.1 °C) and m = 0.1 M KNO3 in aqueous 50% (v/v) DMSO medium. The formation of mixed ligand chelates having 1:1; 1:2 and 1:3 complexes with ligands was identified. The ternary chelates are formed by simultaneous equilibrium. The stability of ternary complexes was investigated and compared with those of the corresponding binary complexes in terms of the D log K parameter. The concentration distribution of the complexes in solution has been evaluated.

Author(s): R. Thanavelan, G. Manikandan, G. Ramalingam, V. Thanikachalam

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