Anion recognition by thiostrepton |
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| Authors: | Godoy-Alcántar C Rivera I L Yatsimirsky A K |
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| Institution: | Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico. |
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| Abstract: | A bicyclic polypeptide antibiotic thiostrepton forms both 1:1 and 1:2 complexes with anions (as tetrabutylammonium salts) in organic solvents with K2 >K1 for F- and K2Cl-, Br-, HSO4-, H2PO4-, but in CHCl3 they follow a different order: Cl- approximatelyHSO4- >F- approximately AcO- > Br > H2PO4-. The binding mode of anions to thiostrepton is discussed on the basis of solvent effects on the complexation selectivity. |
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