The first 1,3-alternate calix[4]arene-bis(crown-6-ethers) with a proton-ionizable group located in front of one crown ether cavity are synthesized. Compared with an analog that has no proton-ionizable group, the two new ligands possess markedly higher Cs + extraction efficiency.
A tribenzo modified 1,3-calix[4]-bis-crown-6: A highly selective receptor for cesium
✍ Scribed by Zouhair Asfari; Véronique Lamare; Jean-François Dozol; Jacques Vicens
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- French
- Weight
- 189 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
It is reported the synthesis of calix[4]-bis-(tribenzo)crown-6 I consisting of a calix[4]arene fixed in the 1,3-alternate conformation by the 1,3-and 2,4-bridges made of two modified polyether chains in which the three central ethylene links have been replaced by three 1,2-phenylenes. Ligand 1 complex cesium cation and not sodium one.
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Four calix[4] arene benzo-crown-6 ethers functionalized with primary amine groups in various positions have been synthesized. The cesium extraction behavior under alkaline and acidic conditions has been measured for these compounds and compared with that of non-amine containing analogs. Extraction
1,3-Alternate calix[4]-cyclen-benzo-crown-6 incorporating a cyclen subunit on one side and a benzocrown-6 on the other side of the calix[4]arene framework has been synthesized. Preliminary complexation studies of this macropolycycle with cesium and zinc picrate salts have been carried out by means o