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Kinetic studies on the dissociation of triethylenetetramine complexes of nickel(II) and copper(II) in aqueous acid media

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Summary

From stopped-flow spectrophotometric studies on the kinetics of dissociation of [M(trien)]2+ (M=CuII, NiII) to M 2+aq and trien H 4+4 in aqueous acid medium, it has been established that the reaction occurs in a complex manner conforming to the relation

$$k_{obs} = k_o + k'_H [H^ + ] + k''_H [H^ + ]^2 $$

At 250 C, I=0.1 mol dm−3 the values of the constants are ko (s−1)=1.2(Ni), 3.0(Cu); k′H (dm3 mol−1 s−1)=37 (Ni), 257 (Cu); k″H (dm6 mol−2 s−1)=0 (Ni), 83,300 (Cu). The enthalpy and entropy of activation for the reactions have been evaluated and a plausible reaction scheme is proposed and discussed.

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Pramanik, T., Banerjea, D. Kinetic studies on the dissociation of triethylenetetramine complexes of nickel(II) and copper(II) in aqueous acid media. Transition Met. Chem. 17, 430–434 (1992). https://doi.org/10.1007/BF02910725

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