Polymeric thiolate complexes in solution. Stability constants of the cadmium(II) complexes of 3-aminopropane-1-thiol
- 1 January 1989
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 1,p. 13-18
- https://doi.org/10.1039/dt9890000013
Abstract
Complex formation between CdII and 3-aminopropane-1-thiol has been studied by means of nearly 425 e.m.f. measurements with a glass electrode in 10 separate titrations at 25 °C in 3 mol dm–3(sodium) perchlorate medium [+10%(v/v) CH3OH]. Conclusions drawn from graphical methods based on the ‘core + links’ hypothesis and on the ‘extended variation’ technique are in accord with results obtained from the numerical treatment. Experimental data for 3 < –log [H+] < 11 can be explained by assuming that the following complexes predominate over a wide pH range: [Cd(HA)3]2+, [Cd3(HA)8]6+, [Cd4(HA)8]8+, and [Cd5(HA)12]10+, HA being the uncharged ligand. The deprotonation of these species gives rise to several mono- and poly-nuclear ternary complexes CdpAqHr, r < q, A denoting the deprotonated form of the ligand. Chelate formation seems very likely. Comparisons with other cadmium(II)–mercaptoamine systems are made.Keywords
This publication has 0 references indexed in Scilit: