Complexation of protons by macrocyclic polyethers in acetonitrile |
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| Affiliation: | 1. Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College street, Toronto, Ontario;2. Department of Materials Science and Engineering, University of Toronto, 184 College street, Toronto, Ontario M5S3E4 Canada |
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| Abstract: | ![]()
The complexation of H+ by different macrocyclic polyethers in acetonitrile solutions has been studied by means of calorimetric titrations. The most stable complex is observed with 18-crown-6. The measured stability constants decrease when the number of benzo substituents of 18C6 are increased. The stability of the complexes formed with larger macrocyclic polyethers is also smaller in comparison with 18C6. Unfavourable entropic changes during the reaction are responsible. Compared with noncyclic polyethers all ligands studied form more stable complexes. Favourable entropic contributions are mainly responsible. |
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