ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The substitution of N-alkyl substituted ethylenediamines for chloride ions in the rapidly equilibrating system \documentclass{article}\pagestyle{empty}\begin{document}$${\rm PdCl}_{\rm 4} ^{{\rm 2 - }} {\rm + H}_{\rm 2} {\rm O}\rightleftharpoons{\rm PdCl}_{\rm 3} ({\rm H}_2 {\rm O)}^{\rm - } + {\rm Cl}^{\rm - }$$\end{document} has been investigated in aqueous acid medium. The kinetic data can be accommodated by the general rate law \documentclass{article}\pagestyle{empty}\begin{document}$$k_{{\rm obs}} = \left\{ {\frac{k}{{\left[{{\rm H}^{\rm + }} \right]}} + \frac{{k'}}{{\left[{{\rm H}^{\rm + } } \right]\left[{{\rm Cl}^{\rm - } } \right]}}} \right\}\left[{{\rm N}_{\rm n} {\rm N}_{\rm m} {\rm en}} \right]_{{\rm total}}$$\end{document} where n = 0, 1, or 2 and m = 0, 1, or 2, depending on whether none, one, or two methyl groups are attached to the two nitrogen atoms of ethylenediamine. Reaction with the most heavily substituted ethylenediamine, namely, N2N2en discloses a change of the mentioned rate law to \documentclass{article}\pagestyle{empty}\begin{document}$$k_{{\rm obs}} = \left\{ {\frac{{k''}}{{\left[{{\rm H}^{\rm + } } \right]}} + \frac{{k'''\left[{{\rm Cl}^{\rm - } } \right]}}{{\left[{{\rm H}^{\rm + } } \right]}}} \right\}\left[{{\rm N}_{\rm 2} {\rm N}_{\rm 2} {\rm en}} \right]_{{\rm total}}$$\end{document} on going from a lower to a higher chloride ion concentration range. This change in the mathematical form of the rate law can be explained in terms of an ion-pair association of N2N2enH+ and free chloride ions.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550060304
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