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Issue 9, 2001
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Thermodynamics of sulfate anion binding by macrocyclic polyammonium receptors

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Abstract

The interaction of SO42− with polyammonium cations derived from fourteen polyamines (5 polyazacycloalkanes, 2 polyazacyclophanes, 3 phenanthrolinacyclophanes, 2 dibenzenacyclophanes and 2 acyclic polyamines) in aqueous solution has been studied by means of potentiometric and microcalorimetric techniques. Only 1 : 1 receptor–anion complexes have been found in solution. Complexed species of considerable stability are formed, although the two acyclic polyamines (dimethylpentaethylenehexaamine and dimethylhexaethyleneheptaamine) and the smallest phenanthrolinacyclophane do not interact with the anion. The complexation reactions are endothermic, or almost athermic, and promoted by invariably favourable entropic contributions, indicating that these pairing processes are mostly determined by the desolvation of the interacting species that occurs upon charge neutralisation. The results are compared with those previously obtained for phosphate binding.

Graphical abstract: Thermodynamics of sulfate anion binding by macrocyclic polyammonium receptors

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Article information


Submitted
21 May 2001
Accepted
02 Jul 2001
First published
14 Aug 2001

J. Chem. Soc., Perkin Trans. 2, 2001, 1765-1770
Article type
Paper

Thermodynamics of sulfate anion binding by macrocyclic polyammonium receptors

P. Arranz, A. Bencini, A. Bianchi, P. Diaz, E. García-España, C. Giorgi, S. V. Luis, M. Querol and B. Valtancoli, J. Chem. Soc., Perkin Trans. 2, 2001, 1765
DOI: 10.1039/B104445C

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