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DOI: 10.1039/A804169E (Paper) Reference Section for: J. Chem. Soc., Faraday Trans., 1998, 94, 2395-2398

ΔG° and TΔS° charge relationships for the binding of carboxylic anions by open-chain polyammonium cations

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Concetta De Stefano, Ottavia Giuffrè and Silvio Sammartano

Abstract

Enthalpies of formation have been determined by titration calorimetry for complexes formed by some polycarboxylic anions (citrate, 1,2,3-propanetricarboxylate, 1,2,3,4-butanetetracarboxylate) with open-chain polyammonium cations C2(n-1)NnH(6n-2)n+ (n=2–6), at 25°C. ΔH° values are generally positive and, therefore, these complexes are entropically stabilized. ΔG° and TΔS° follow a linear trend as a function of polyammonium cation and carboxylic anion charges. The linear dependence on charges of ΔG° is the same for different systems, whilst that of TΔS° is specific for each system. ΔG° and TΔS° charge relationships are reported.

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