New podands and macrocycles containing “dioxazaphosphocane” moieties. Synthesis, structural determination and study of their binding and ionophoric properties with Ca2+ and Mg2+ cations
✍ Scribed by Anne Pujo-Bouteillé; Lydia Lamandé; Lucien Lopez; Louis Cazaux; Jacques Bellan
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- French
- Weight
- 840 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0040-4020
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✦ Synopsis
The reactions of diacids with the bicyclophosphane 1 lead to podands 3a-f in which two dioxazaphosphocane moieties are linked by a more or less rigid spacer owing to the starting diacid. Macrocycles 4a-b are. obtained by cyclixation of podands 3a-b by way of Michaelis-Becker reaction. The formation of Ca2+ and Mg2' complexes with 3sf and &t-b has been investigated by UV, fB and NMR spectroscopies. Liquid-liquid extraction studies show for macrocycles efficient extracting properties and good selectivities of Ca2+ towards Mg 2+. The calcium transport across a chloroformic membrane agrees better with stability constants than with extraction data.