Abstract
Solvent extraction technique was utilized to study the ligand substitution reaction kinetics of bis (2-methyl-8-quinolinolato)copper (ll) (CuL2) with ethylenediaminetetraacetate ion (EDTA). The reaction is described as follows:The rate of back extraction of the CuL2 complex from chloroform layer to the aqueous layer by EDTA was determined spectrophotometrically measuring absorption band of the CuL2 com- plex in the organic phase at 400 nm. The rate of back extraction increases quite rapidly by the elevation of shaking speed, and reaches constant value at and above the shaking speed of 340 strokes per minute. Within this plateau region, the observed rate of back extraction was considered to be equal to the rate of chemical reaction in the aqueous phase. The pH and EDTA concentration dependences of the pseudo first order rate constant, kips, were analyzed over a pH range from 6.2 to 7.6 at 25°C and ionic strength of 0.1.The initial rate of the reaction can be expressed by the following equation:The estimated rate constants, kkh2y, kH3Y, kY are 1.1X104, 4.6X10-2, 3.8X10-21.mol-1, sec-1, respectively.
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