Polarographic studies on the formation constants of complexes of indium with aspirin
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 2201-2204
- https://doi.org/10.1039/j19680002201
Abstract
A polarographic study of indium–aspirin complexes has been carried out, with the ionic strength kept constant (µ= 1) by adding requisite amounts of sodium perchlorate. The reduction of indium in various concentrations (0–0·36M) is diffusion-controlled but the process is not reversible. The kinetic parameters α and Ks have been calculated by Gelling's method. The value of Ks was about 2 ± 0·5 × 10–3 cm./sec., showing that the reduction is a quasi-reversible process. Since the reduction is quasi-reversible, Gelling's method is used to determine the reversible half-wave potential (E1/2 r). Thus, knowing E1/2 r, the stability constants of the various complexes in the indium–aspirin anion system have been evaluated by DeFord and Hume's treatment. The values for various complex species present in the solution at 30°, In(Asp)2+, In(Asp)2 +, In(Asp)3, In(Asp)4 –, and In(Aps)5 2–, are 3 × 104, 5 × 104, 300 × 104, 650 × 104, and 13,500 × 104, respectively. Since the reduction is diffusion-controlled, indium can be determined polarographically in acetylsalicylate solution.Keywords
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