Title

Does Thermochemical Mimicry Extend to Gibbs Energies? The Differences of K+ and NH4+, and of Na+ and H3O+

Document Type

Article

Journal/Book Title

Structural Chemistry

Publication Date

1999

Publisher

Springer Verlag (Germany)

Volume

10

Issue

5

First Page

391

Last Page

392

DOI

10.1023/A:1022051829674

Abstract

A while ago we presented the concept of thermochemical mimicry [1] in the context of the energetics of complexation of K+ and NH4+ in a variety of environments and showed there was a remarkable similarity [2]. The difference of enthalpies of formation of salts as found in the solid state and in aqueous solution were shown to be nearly the same, and additionally nearly equal to the value for the free gaseous ions. The lattice energies of these salts were also shown to be nearly identical as were the complexation energy of these gaseous ions with a variety of type and number of ligands. The ion mobility of K+ and NH4+ as found as salts in a variety of media were also shown to be very nearly the same. Recently we have become acquainted with yet another, though quite old and conceptually unique, similarity: These two ions have comparable effects on food thickeners [3]. This result excited us and so encouraged a relooking at these two ions and their energetics.

Comments

http://www.springerlink.com/content/l547107m8735444r/

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Published by Springer Verlag in Structural Chemistry.

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