No abstract

No abstract

increase the ICB effect. The reactions involving NiEDTA, Ni(trien), and NiBPEDA all have nickel-nitrogen bond rupture as rate determining while the ZnEDTA system involves copper-ligand bond formation as rate determining. Of the three possible explanations for the increased activity due to CuOH+, the first, an increase in the stability of the dinuclear intermediate, cannot explain why CuOH+ reacts at an accelerated rate with ZnEDTA because the dinuclear intermediate forms after the rate-determining step. The second explanation, a transition state, could explain all four systems but is based on the tenuous grounds of an acceleration in copper water loss due to hydroxide. The third possibility, however, fits all four cases since a hydrogen-bonded or hydroxidebridged intermediate would affect the values of Kos, the outer-sphere association constant, to the same extent that it would affect the stability of a dinuclear intermediate. Therefore it is suggested that this is the most likely explanation for the increased reactivity of CuOH+.

No abstract

No abstract